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  • Articles  (54,182)
  • Oxford University Press  (36,898)
  • Emerald  (17,284)
  • 2020-2024  (478)
  • 2000-2004  (53,704)
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  • 1
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    Fault imaging at Mt Pollino (Italy) from relative location of microearthquakes (2021)
    Oxford University Press
    Details
    Publication Date: 2023-10-26
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2021. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: Relative location of microearthquakes that occurred at Mt Pollino (Italy) from 2011 to 2013 have been analyzed with the aim of a detailed imaging of the geometry of active faults. We identified 27 clusters composed of a number of earthquakes from 9 to 33, with local magnitude in the range 0.6–2.7. The relative location shows that the distribution of hypocentres in each cluster is characterized by extension from few tens of meters to at most 350 m. For each cluster the hypocentre distribution was fitted by a plane to infer the fault orientation, and results were compared with the fault plane solutions corresponding to the focal mechanism of earthquakes of the same cluster. The comparison shows a good agreement in most of the cases. The relative location analysis, generally applied to earthquakes with similar waveform, has been improved to permit also the relative location of earthquakes characterized by not similar signals. To achieve this purpose a modified procedure that overcome the condition of very similar waveforms has been applied to estimate the time delay between first pulses of the master events. The relative location of master events of all clusters shows a precise imaging of the relative position of all analysed sources and allows also to follow with high accuracy the evolution in time of the seismic swarm within the selected periods. The hypocentre position of master events and the nearly parallel fitting planes of any clusters suggest that most of the analyzed earthquakes were produced by different patches of the same fault. The final results depict a main fault plane characterized by NW–SE strike, dip of about 35–45° and depth between 4.5 and 6.5 km b.s.l. Focal mechanisms, used also to evaluate the local stress field, are mostly of normal type with few strike slip solutions for the shallowest events. This result is in good agreement with the local tectonic stress regime that is characterized by predominant NE–SW transtension, as inferred from structural, seismological and geophysical data.
    Description: Published
    Description: 637–648
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: Persistence, memory, correlations, clustering, Spatial analysis, Crustal imaging, Earthquake source observations, Seismicity and tectonics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 2
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    Physics-based simulation of sequences with multiple main shocks in Central Italy (2020)
    Oxford University Press
    Details
    Publication Date: 2023-10-26
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2020. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved
    Description: The application of a physics-based earthquake simulator to Central Italy allowed the compilation of a synthetic seismic catalogue spanning 100 000 yr, containing more than 300 000 M ≥ 4.0 simulated earthquakes, without the limitations that real catalogues suffer in terms of completeness, homogeneity and time duration. The seismogenic model upon which we applied the simulator code was derived from version 3.2.1 of the Database of Individual Seismogenic Sources (DISS; http://diss.rm.ingv.it/diss/), selecting, and modifying where appropriate, all the fault systems that are recognized in the portion of Central Italy considered in this study, with a total of 54 faults. Besides tectonic stress loading and static stress transfer as in the previous versions, the physical model on which the latest version of our simulation algorithm is based also includes the Rate and State constitutive law that helps to reproduce Omori’s law. One further improvement in our code was also the introduction of trapezoidalshaped faults that perform better than known faults. The resulting synthetic seismic catalogue exhibits typical magnitude, space and time features which are comparable to those in real observations. These features include the total seismic moment rate, the earthquake magnitude distribution, and the short- and medium-term earthquake clustering. A typical aspect of the observed seismicity in Central Italy, aswell as across thewhole Italian landmass and elsewhere, is the occurrence of earthquake sequences characterized by multiple main shocks of similar magnitude. These sequences are different from the usual earthquake clusters and aftershock sequences, since they have at least two main shocks of similar magnitude. Therefore, special attentionwas devoted to verifyingwhether the simulated catalogue includes this notable aspect. For this purpose, we developed a computer code especially for this work to count the number of multiple events contained in a seismic catalogue under a quantitative definition. We found that the last version of the simulator code produces a slightly larger number of multiple events than the previous versions, but not as large as in the real catalogue. A possible reason for this drawback is the lack of components such as pore-pressure changes due to fluid-diffusion in the adopted physical model.
    Description: Published
    Description: 526–542
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 3
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    Upper mantle deformation signatures of craton–orogen interaction in the Carpathian–Pannonian region from SKS anisotropy analysis (2021)
    Oxford University Press
    Details
    Publication Date: 2023-10-31
    Description: Since the Mesozoic, central and eastern European tectonics have been dominated by the closure of the Tethyan Ocean as the African and European plates collided. In the Miocene, the edge of the East European Craton and Moesian Platform were reworked in collision during the Carpathian orogeny and lithospheric extension formed the Pannonian Basin. To investigate the mantle deformation signatures associated with this complex collisional-extensional system, we carry out SKS splitting analysis at 123 broad-band seismic stations in the region. We compare our measurements with estimates of lithospheric thickness and recent seismic tomography models to test for correlation with mantle heterogeneities. Reviewing splitting delay times in light of xenolith measurements of anisotropy yields estimates of anisotropic layer thickness. Fast polarization directions are mostly NW–SE oriented across the seismically slow West Carpathians and Pannonian Basin and are independent of geological boundaries, absolute plate motion direction or an expected palaeo-slab roll-back path. Instead, they are systematically orthogonal to maximum stress directions, implying that the indenting Adria Plate, the leading deformational force in Central Europe, reset the upper-mantle mineral fabric in the past 5 Ma beneath the Pannonian Basin, overprinting the anisotropic signature of earlier tectonic events. Towards the east, fast polarization directions are perpendicular to steep gradients of lithospheric thickness and align along the edges of fast seismic anomalies beneath the Precambrian-aged Moesian Platform in the South Carpathians and the East European Craton, supporting the idea that craton roots exert a strong influence on the surrounding mantle flow. Within the Moesian Platform, SKS measurements become more variable with Fresnel zone arguments indicating a shallow fossil lithospheric source of anisotropy likely caused by older tectonic deformation frozen in the Precambrian. In the Southeast Carpathian corner, in the Vrancea Seismic Zone, a lithospheric fragment that sinks into the mantle is sandwiched between two slow anomalies, but smaller SKS delay times reveal weaker anisotropy occurs mainly to the NW side, consistent with asymmetric upwelling adjacent to a slab, slower mantle velocities and recent volcanism.
    Description: Published
    Description: 2105–2118
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: Seismic anisotropy ; geodynamics ; Seismic anisotropy and geodynamics
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 4
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    Broad-band ground-motion simulation of 2016 Amatrice earthquake, Central Italy (2021)
    Oxford University Press
    Details
    Publication Date: 2023-11-21
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2021. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: On 24 August 2016 at 01:36 UTC a ML6.0 earthquake struck several villages in central Italy, among which Accumoli, Amatrice and Arquata del Tronto. The earthquake was recorded by about 350 seismic stations, causing 299 fatalities and damage with macroseismic intensities up to 11. The maximum acceleration was observed at Amatrice station (AMT) reaching 916 cm s–2 on E–W component, with epicentral distance of 15 km and Joyner and Boore distance to the fault surface (RJB) of less than a kilometre. Motivated by the high levels of observed ground motion and damage, we generate broad-band seismograms for engineering purposes by adopting a hybrid method. To infer the low frequency seismograms, we considered the kinematic slip model by Tinti et al . The high frequency seismograms were produced using a stochastic finite-fault model approach based on dynamic corner-frequency. Broadband synthetic time-series were therefore obtained by merging the low and high frequency seismograms. Simulated hybrid ground motions were compared both with the observed ground motions and the ground-motion prediction equations (GMPEs), to explore their performance and to retrieve the region-specific parameters endorsed for the simulations. In the near-fault area we observed that hybrid simulations have a higher capability to detect near source effects and to reproduce the source complexity than the use of GMPEs. Indeed, the general good consistency found between synthetic and observed ground motion (both in the time and frequency domain), suggests that the use of regional-specific source scaling and attenuation parameters together with the source complexity in hybrid simulations improves ground motion estimations. To include the site effect in stochastic simulations at selected stations, we tested the use of amplification curves derived from HVRSs (horizontal-to-vertical response spectra) and from HVSRs (horizontal-to-vertical spectral ratios) rather than the use of generic curves according to NTC18 Italian seismic design code. We generally found a further reduction of residuals between observed and simulated both in terms of time histories and spectra.
    Description: Published
    Description: 1753–1779
    Description: 6T. Studi di pericolosità sismica e da maremoto
    Description: JCR Journal
    Keywords: 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 5
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    Rapid Prediction of Earthquake Ground Shaking Intensity Using Raw Waveform Data and a Convolutional Neural Network (2021)
    Oxford University Press
    Details
    Publication Date: 2023-11-16
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2020. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved
    Description: This study describes a deep convolutional neural network (CNN) based technique for the prediction of intensity measurements (IMs) of ground shaking. The input data to the CNN model consists of multistation 3C broadband and accelerometric waveforms recorded during the 2016 Central Italy earthquake sequence for M $\ge$ 3.0. We find that the CNN is capable of predicting accurately the IMs at stations far from the epicenter and that have not yet recorded the maximum ground shaking when using a 10 s window starting at the earthquake origin time. The CNN IM predictions do not require previous knowledge of the earthquake source (location and magnitude). Comparison between the CNN model predictions and the predictions obtained with Bindi et al. (2011) GMPE (which require location and magnitude) has shown that the CNN model features similar error variance but smaller bias. Although the technique is not strictly designed for earthquake early warning, we found that it can provide useful estimates of ground motions within 15-20 sec after earthquake origin time depending on various setup elements (e.g., times for data transmission, computation, latencies). The technique has been tested on raw data without any initial data pre-selection in order to closely replicate real-time data streaming. When noise examples were included with the earthquake data, the CNN was found to be stable predicting accurately the ground shaking intensity corresponding to the noise amplitude.
    Description: Published
    Description: 1379–1389
    Description: 8T. Sismologia in tempo reale
    Description: JCR Journal
    Keywords: Physics - Geophysics; Physics - Geophysics ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 6
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    Understanding seismic path biases and magmatic activity at Mount St Helens volcano before its 2004 eruption (2021)
    Oxford University Press
    Details
    Publication Date: 2023-11-16
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2020. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: In volcanoes, topography, shallow heterogeneity and even shallow morphology can substan- tially modify seismic coda signals. Coda waves are an essential tool to monitor eruption dynamics and model volcanic structures jointly and independently from velocity anomalies: it is thus fundamental to test their spatial sensitivity to seismic path effects. Here, we apply the Multiple Lapse Time Window Analysis (MLTWA) to measure the relative importance of scattering attenuation vs absorption at Mount St Helens volcano before its 2004 erup- tion. The results show the characteristic dominance of scattering attenuation in volcanoes at lower frequencies (3–6 Hz), while absorption is the primary attenuation mechanism at 12 and 18 Hz. Scattering attenuation is similar but seismic absorption is one order of magnitude lower than at open-conduit volcanoes, like Etna and Kilauea, a typical behaviour of a (rela- tively) cool magmatic plumbing system. Still, the seismic albedo (measuring the ratio between seismic energy emitted and received from the area) is anomalously high (0.95) at 3 Hz. A radiative-transfer forward model of far- and near-field envelopes confirms this is due to strong near-receiver scattering enhancing anomalous phases in the intermediate and late coda across the 1980 debris avalanche and central crater. Only above this frequency and in the far-field diffusion onsets at late lapse times. The scattering and absorption parameters derived from MLTWA are used as inputs to construct 2-D frequency-dependent bulk sensitivity kernels for the S-wave coda in the multiple-scattering (using the Energy Transport Equations—ETE) and diffusive (AD, independent of MLTWA results) regimes. At 12 Hz, high coda-attenuation anomalies characterize the eastern side of the volcano using both kernels, in spatial correla- tion with low-velocity anomalies from literature. At 3 Hz, the anomalous albedo, the forward modelling, and the results of the tomographic imaging confirm that shallow heterogeneity beneath the extended 1980 debris-avalanche and crater enhance anomalous intermediate and late coda phases, mapping shallow geological contrasts. We remark the effect this may have on coda-dependent source inversion and tomography, currently used across the world to image and monitor volcanoes. At Mount St Helens, higher frequencies and deep borehole data are necessary to reconstruct deep volcanic structures with coda waves.
    Description: Scottish Alliance for Geosciences Environment and Society and the Kleinman Grant for Volcano Research
    Description: Published
    Description: 169-188
    Description: 1T. Struttura della Terra
    Description: 2V. Struttura e sistema di alimentazione dei vulcani
    Description: 3IT. Calcolo scientifico
    Description: JCR Journal
    Keywords: NorthAmerica ; Wave scattering and diffraction. ; Codawaves ; Seismicattenuation ; Seismic tomography ; Volcano seismology ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 7
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    Methodology to identify the reference rock sites in regions of medium-to-high seismicity: an application in Central Italy (2021)
    Oxford University Press
    Details
    Publication Date: 2023-11-14
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2020. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: To evaluate the site response using both empirical approaches (e.g. standard spectral ratio, ground motion models (GMMs), generalized inversion techniques, etc.) and numerical 1-D/2-D analyses, the definition of the reference motion, that is the ground motion recorded at stations unaffected by site-effects due to topographic, stratigraphic or basin effects, is needed. The main objective of this work is to define a robust strategy to identify the seismic stations that can be considered as reference rock sites, using six proxies for the site response: three proxies are related to the analysis of geophysical and seismological data (the repeatable site term from the residual analysis, the resonance frequencies from horizontal-to-vertical spectral ratios on noise or earthquake signals, the average shear wave velocity in the first 30 m); the remaining ones concern geomorphological and installation features (outcropping rocks or stiff soils, flat topography and absence of interaction with structures). We introduce a weighting scheme to take into account the availability and the quality of the site information, as well as the fulfillment of the criterion associated to each proxy. We also introduce a hierarchical index, to take into account the relevance of the proposed proxies in the description of the site effects, and an acceptance threshold for reference rock sites identification. The procedure is applied on a very large data set, composed by accelerometric and velocimetric waveforms, recorded in Central Italy in the period 2008–2018. This data set is composed by more than 30 000 waveforms relative to 450 earthquakes in the magnitude range 3.2–6.5 and recorded by more than 450 stations. A total of 36 out of 133 candidate stations are identified as reference sites: the majority of them are installed on rock with flat topography, but this condition is not sufficient to guarantee the absence of amplifications, especially at high frequencies. Seismological analyses are necessary to exclude stations affected by resonances. We test the impact of using these sites by calibrating a GMMs. The results show that for reference rock sites the median predictions are reduced down to about 45 per cent at short periods in comparison to the generic rock motions.
    Description: Published
    Description: 2053–2067
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 8
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    Arrival-angle effects on two-receiver measurements of phase velocity (2021)
    Oxford University Press
    Details
    Publication Date: 2023-11-14
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2020. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: We compile a data set of Rayleigh-wave phase velocities between pairs of stations, based on teleseismic events located on the same great circle as the two stations. We validate our observations against dispersion estimates based on ambient-noise cross correlations at the same station pairs. Discrepancies between the results of the two methods can in principle be explained by deviations in the wave propagation path between earthquake and receivers, due to lateral heterogeneity in the Earth’s structure, but the latter effect has, so far, not been precisely quantified nor corrected for. We implement an algorithm to measure the arrival angle of earthquake-generated surface waves and correct the dispersion measurements accordingly. Application to a data set from the Central-Western Mediterranean shows that the arrival-angle correction almost entirely accounts for the discrepancy in question, decreasing significantly the velocity bias for a wide range of periods.
    Description: Published
    Description: 1838–1844
    Description: 1T. Struttura della Terra
    Description: JCR Journal
    Keywords: 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 9
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    3-D Q-coda attenuation structure at Mt. Etna (Italy) (2021)
    Oxford University Press
    Details
    Publication Date: 2023-11-16
    Description: This article has been accepted for publication in Geophysical Journal International ©: The Authors 2021. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. Uploaded in accordance with the publisher's self-archiving policy.
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2021. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: Three dimensional attenuation images of Mt Etna volcano obtained by the analysis of Q-coda from local volcano-tectonic earthquakes are presented in this work. Seismic sources are confined inside the Etna structure with a maximum focal depth of 35 km below the sea level. The space distribution of the attenuation values was calculated by using 3-D weighting functions derived by the sensitivity kernels of Pacheco & Snieders and approximated by a polynomial interpolation, represented in the maps by using a backprojection method. Data were analyzed in four bands with central frequency placed at 1.5, 3, 6 and 12 Hz, respectively. We observed a frequency dependence of Q-coda with values that range from 55 at 1.5 Hz to 218 at 12 Hz. Q-coda space distribution in the Etna area shows almost uniformity in the average attenuation in the first 35 km below the surface. The images were derived with a resolution of 5 km. We observe as one of our main conclusions that Q-coda attenuation space anomalies are correlated with the areas of highest structural heterogeneities and are distributed along the well-known tectonic structures which characterize the crust in Mt Etna region. Previous and numerous velocity and attenuation images describing the structure of Mt Etna support our main conclusion: high Q-coda volumes almost coincide with the zones marked by high velocity and relative low total attenuation for direct waves.
    Description: Published
    Description: 544–558
    Description: 2V. Struttura e sistema di alimentazione dei vulcani
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 10
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    Source modelling and strong ground motion simulations for the 24 January 2020, Mw 6.8 Elazığ earthquake, Turkey (2021)
    Oxford University Press
    Details
    Publication Date: 2023-11-29
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2020. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: On 24 January 2020 an Mw 6.8 earthquake occurred at 20:55 local time (17:55 UTC) in eastern Turkey, close to the town of Sivrice in the Elazığ province, causing widespread considerable seismic damage in buildings. In this study, we analyse the main features of the rupture process and the seismic ground shaking during the Elazığ earthquake. We first use Interferometric Synthetic Aperture Radar (InSAR) interferograms (Sentinel-1 satellites) to constrain the fault geometry and the coseismic slip distribution of the causative fault segment. Then, we utilize this information to analyse the ground motion characteristics of the main shock in terms of peak ground acceleration (PGA), peak ground velocity (PGV) and spectral accelerations. The absence of seismic registrations in near-field for this earthquake imposes major constraints on the computation of seismic ground motion estimations in the study area. To do this, we have used a stochastic finite-fault simulation method to generate high-frequency ground motions synthetics for the Mw 6.8 Elazığ 2020 earthquake. Finally, we evaluate the potential state of stress of the unruptured portions of the causative fault segment as well as of adjacent segments, using the Coulomb stress failure function variations. Modelling of geodetic data shows that the 2020 Elazığ earthquake ruptured two major slip patches (for a total length of about 40 km) located along the Pütürge segment of the well-known left-lateral strike-slip East Anatolian Fault Zone (EAFZ), with up to 2.3 m of slip and an estimated geodetic moment of 1.70 × 1019 Nm (equivalent to a Mw 6.8). The position of the hypocentre supports the evidence of marked WSW rupture directivity during the main shock. In terms of ground motion characteristics, we observe that the high-frequency stochastic ground motion simulations have a good capability to reproduce the source complexity and capture the ground motion attenuation decay as a function of distance, up to the 200 km. We also demonstrate that the design spectra corresponding to 475 yr return period, provided by the new Turkish building code is not exceeded by the simulated seismograms in the epicentral area where there are no strong motion stations and no recordings available. Finally, based on the Coulomb stress distribution computation, we find that the Elazığ main shock increased the stress level of the westernmost part of the Pütürge fault and of the adjacent Palu segment and as a result of an off-fault lobe.
    Description: Published
    Description: 1054–1068
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 11
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    Ontogeny of osmoregulation of the Asian shore crab Hemigrapsus sanguineus at an invaded site of Europe (2021)
    Oxford University Press
    In:  EPIC3Conservation Physiology, Oxford University Press, 9(1), ISSN: 2051-1434
    Details
    Publication Date: 2024-01-01
    Description: We studied the ontogeny of osmoregulation of the Asian shore crab Hemigrapsus sanguineus at an invaded area in the North Sea. H. sanguineus is native to Japan and China but has successfully invaded the Atlantic coast of North America and Europe. In the invaded areas, H. sanguineus is becoming a keystone species as driver of community structure and the adults compete with the shore crab Carcinus maenas. Strong osmoregulatory abilities may confer the potential to use and invade coastal areas already earlier in the life cycle. We reared larvae and first juveniles at 24°C in seawater from hatching to intermoult of each developmental stage (zoea I-V, megalopa, crab I). We exposed each stage to a range of salinities (0–39 ppt) for 24 h, and then we quantified haemolymph osmolality, using nano-osmometry. In addition, we quantified osmolality in field-collected adults after acclimation to the test salinities for 6 days. Larvae of H. sanguineus were able to hyper-osmoregulate at low salinities (15 and 20 ppt) over the complete larval development, although the capacity was reduced at the zoeal stage V; at higher salinities (25–39 ppt), all larval stages were osmoconformers. The capacity to slightly hypo-regulate at high salinity appeared in the first juvenile. Adults were able to hyper-osmoregulate at low salinities and hypo-regulate at concentrated seawater (39 ppt). H. sanguineus showed a strong capacity to osmoregulate as compared to its native competitor C. maenas, which only hyper-regulates at the first and last larval stages and does not hypo-regulate at the juvenile-adult stages. The capacity of H. sanguineus to osmoregulate over most of the life cycle should underpin the potential to invade empty niches in the coastal zone (characterized by low salinity and high temperatures). Osmoregulation abilities over the whole life cycle also constitute a strong competitive advantage over C. maenas.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , NonPeerReviewed
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  • 12
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    The ground deformation of the south-eastern flank of Mount Etna monitored by GNSS and SAR interferometry from 2016 to 2019 (2023)
    Oxford University Press
    Details
    Publication Date: 2023-12-27
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2023. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: The south-eastern sector of the Mount Etna, Italy, is characterized by numerous active faults, in particular the Belpasso–Ognina lineament, the Tremestieri–San Gregorio–Acitrezza fault, the Trecastagni fault and the Fiandaca–Nizzeti fault including the Timpe Fault System. Their activity is the result of both volcanism and tectonics. Here, we analyse the ground deformation occurred from 2016 to 2019 across those active faults by using the GNSS data acquired at 22 permanent stations and 35 campaign points observed by the Etna Observatory (INGV) and by the University of Catania. We also use the time-series of line of sight displacement of permanent scatterers SENTINEL-1 A-DInSAR obtained by using the P-SBAS tool of the ESA GEP-TEP (Geohazards Thematic Exploitation Platform) service. We discriminate the contributions of the regional tectonic strain, the inflations, the deflations of the volcano and the gravitational sliding in order to analyse the deformation along the faults of the south-eastern flank of Etna. The shallow and destructive Mw = 4.9 earthquake of 2018 December 26 occurred within the studied area two days after a dyke intrusion, that propagated beneath the centre of the volcano accompanied by a short eruption. Both GNSS and InSAR time-series document well those events and allow to investigate the post-seismic sliding across the faults of south-eastern flank. We analyse the slow slip events (SSE) that are observed in the GNSS and InSAR time-series in the vicinity of the Acitrezza fault. We quantify and discuss the tectonic origin of the Belpasso–Ognina lineament that we interpreted as a tear fault.
    Description: Published
    Description: 664–682
    Description: OST3 Vicino alla faglia
    Description: JCR Journal
    Keywords: Satellite geodesy ; Transient deformation ; Interferometry ; Fractures ; fault ; Volcano monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 13
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    Strong ground-motion prediction equations from induced earthquakes in St. Gallen geothermal field, Switzerland (2023)
    Oxford University Press
    Details
    Publication Date: 2023-03-15
    Description: Ground shaking, whether it is due to natural or induced earthquakes, has always been a matter of concern since it correlates with structural/non-structural damage and can culminate in human anxiety. Industrial activities such as water injection, gas sequestration and waste fluid disposals, promote induced seismicity and consequent ground shaking that can hinder ongoing activities. Therefore, keeping in mind the importance of timely evaluation of a seismic hazard and its mitigation for societal benefits, the present study proposes specifically designed ground-motion prediction equations (GMPEs) from induced earthquakes in the St. Gallen geothermal area, Switzerland. The data analysed in this study consist of 343 earthquakes with magnitude −1.17 ≤ ML, corr ≤ 3.5 and hypocentral distance between 4 and 15 km. The proposed study is one of the first to incorporate ground motions from negative magnitude earthquakes for the development of GMPEs. The GMPEs are inferred with a two-phase approach. In the first phase, a reference model is obtained by considering the effect of source and medium properties on the ground motion. In the second phase the final model is obtained by including a site/station effect. The comparison between the GMPEs obtained in the present study with GMPEs developed for the other induced seismicity environments highlights a mismatch that is ascribed to differences in regional seismic environment and local site conditions of the respective regions. This suggests that, when dealing with induced earthquakes, GMPEs specific for the study should be inferred and used for both monitoring purposes and seismic hazard analyses.
    Description: Published
    Description: 820–832
    Description: 5T. Sismologia, geofisica e geologia per l'ingegneria sismica
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 14
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    Cross-site comparisons of dryland ecosystem response to climate change in the US long-term ecological research network (2023)
    Oxford University Press
    Details
    Publication Date: 2023-02-25
    Description: © The Author(s), 2022. This article is distributed under the terms of the Creative Commons Attribution License. The definitive version was published in Hudson, A. R., Peters, D. P. C., Blair, J. M., Childers, D. L., Doran, P. T., Geil, K., Gooseff, M., Gross, K. L., Haddad, N. M., Pastore, M. A., Rudgers, J. A., Sala, O., Seabloom, E. W., & Shaver, G. Cross-site comparisons of dryland ecosystem response to climate change in the US long-term ecological research network. Bioscience, 72(9), (2022): 889–907, https://doi.org/10.1093/biosci/biab134.
    Description: Long-term observations and experiments in diverse drylands reveal how ecosystems and services are responding to climate change. To develop generalities about climate change impacts at dryland sites, we compared broadscale patterns in climate and synthesized primary production responses among the eight terrestrial, nonforested sites of the United States Long-Term Ecological Research (US LTER) Network located in temperate (Southwest and Midwest) and polar (Arctic and Antarctic) regions. All sites experienced warming in recent decades, whereas drought varied regionally with multidecadal phases. Multiple years of wet or dry conditions had larger effects than single years on primary production. Droughts, floods, and wildfires altered resource availability and restructured plant communities, with greater impacts on primary production than warming alone. During severe regional droughts, air pollution from wildfire and dust events peaked. Studies at US LTER drylands over more than 40 years demonstrate reciprocal links and feedbacks among dryland ecosystems, climate-driven disturbance events, and climate change.
    Description: Funding was provided by the USDA-ARS SCINet Big Data Project (grant no. 0500–00093–001–00-D), and the National Science Foundation US LTER Program to New Mexico State University for the Jornada Basin (grant no. DEB 20–25166), Kansas State University for the Konza Prairie (grant no. DEB 2025849), the Kellogg Biological Station (grant no. DEB 1832042), Cedar Creek Ecosystem Science Reserve (grants no. DEB-1234162 and no. DEB-1831944), ARC (grant no. DEB-1637459), MCM (grant no. OPP-1637708), CAP (grant no. DEB-1832016), and SEV (grant no. DEB-1655499). Support was also provided by the Minnesota Supercomputer Institute and the University of Minnesota, Michigan State University AgBioResearch.
    Repository Name: Woods Hole Open Access Server
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  • 15
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    Mechanism of the 2017 M-w 6.3 Pasni earthquake and its significance for future major earthquakes in the eastern Makran (2023)
    Oxford University Press
    Details
    Publication Date: 2023-02-17
    Description: Author Posting. © The Author(s), 2022. This is the author's version of the work. It is posted here by permission of Oxford University Press for personal use, not for redistribution. The definitive version was published in Geophysical Journal International 231(2),(2022): 1434–1445, https://doi.org/10.1093/gji/ggac257.
    Description: Makran subduction zone is very active with ∼38 mm yr−1 convergence rate and has experienced great earthquakes in the past. The latest great earthquake of 1945 Mw 8.1 event also triggered a large tsunami and led to ∼4000 casualties. However, due to incomplete historical seismicity records and poor modern instrumentation, earthquake mechanism, co-seismic slip and tsunami characteristics in Makran remain unclear. On 2017 February 17, an Mw 6.3 earthquake rattled offshore Pasni of Pakistan in the eastern Makran, marking the largest event after the 1945 Mw 8.1 earthquake with good geodetic and geophysical data coverage. We use a combination of seismicity, multibeam bathymetry, seismic profile, InSAR measurements and tide-gauge observation to investigate the seismogenic structure, co-seismic deformation, tsunami characteristics of this event and its implication for future major earthquakes. Our results indicate that (1) the earthquake occurred on the shallow-dipping (3°–4°) megathrust; (2) the megathrust co-seismically slipped 15 cm and caused ∼2–4 cm ground subsidence and uplift at Pasni; (3) our tsunami modelling reproduces the observed 5-cm-high small tsunami waveforms. The Pasni earthquake rupture largely overlaps the 1945 slip patch and disturbs the west and east megathrust segments that have not ruptured yet at least since 1765. With such stress perturbation and possible stress evolution effect from the 1945 earthquake, the unruptured patches may fail in the future. This study calls for more preparedness in mitigating earthquake and associated hazards in the eastern Makran.
    Description: his study is financially supported by the National Natural Science Foundation of China (Nos. 42076059, 41890813, 41976066 and 41976064), the Key Special Project for Introduced Talents Team of Southern Marine Science and Engineering Guangdong Laboratory (Guangzhou) (No. GML2019ZD0205), Chinese Academy of Sciences (Nos. Y4SL021001, QYZDY-SSW-DQC005, 131551KYSB20200021, ISEE2021PY03, 133244KYSB20180029 and E1SL3C02), Guangdong Basic and Applied Basic Research Foundation (No. 2021B1515020098) and China–Pakistan Joint Research Centre on Earth Sciences.
    Keywords: Tsunamis ; Earthquake dynamics ; Earthquake hazards ; Seismicity and tectonics ; Subduction zone processes
    Repository Name: Woods Hole Open Access Server
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  • 16
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    Genesis of Oceanic Oxide Gabbros and Gabbronorites During Reactive Melt Migration at Transform Walls (Doldrums Megatransform System; 7–8°N Mid-Atlantic Ridge) (2023)
    Oxford University Press
    Details
    Publication Date: 2023-01-25
    Description: The Doldrums Megatransform System (~7–8°N, Mid-Atlantic Ridge) shows a complex architecture including four intra-transform ridge segments bounded by five active transform faults. Lower crustal rocks are exposed along the Doldrums and Vernadsky transform walls that bound the northernmost intra-transform ridge segment. The recovered gabbros are characterized by variably evolved chemical compositions, ranging from olivine gabbros to gabbronorites and oxide gabbros, and lack the most primitive gabbroic endmembers (troctolites, dunites). Notably, the numerous recovered gabbronorites show up to 20 vol. % of coarse-grained orthopyroxene. Although covariations in mineral and bulk-rock chemical compositions of the olivine and oxide gabbros define trends of crystallization from a common parental melt, the gabbronorites show elevated light over heavy rare earth elements (LREE/HREE) ratios in both bulk-rock and mineral compositions. These features are not consistent with a petrological evolution driven solely by fractional crystallization, which cannot produce the preferential enrichments in highly incompatible elements documented in the orthopyroxene-bearing lithologies. We suggest that gabbronorites crystallized from evolved melts percolating and partly assimilating a pre-existing olivine gabbro matrix. Saturation in orthopyroxene and selective enrichments in LREE relative to M-HREE are both triggered by an increase in assimilated crystal mass, which ranges from negligible in the oxide-gabbros to abundant in the gabbronorites. This melt–rock reaction process has been related to lateral melt migration beneath ridge-transform intersections, where variably evolved melts injected from the peripheral parts of the melting region towards the transform zone may interact with a gabbroic crystal mush to form abundant oxide-bearing gabbronoritic associations.
    Description: Published
    Description: egac086
    Description: 3A. Geofisica marina e osservazioni multiparametriche a fondo mare
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 17
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    New constraints on the shear wave velocity structure of the Ivrea geophysical body from seismic ambient noise tomography (Ivrea-Verbano Zone, Alps) (2024)
    Oxford University Press
    Details
    Publication Date: 2024-01-19
    Description: We performed seismic ambient noise tomography to investigate the shallow crustal structure around the Ivrea geophysical body (IGB) in the Ivrea-Verbano Zone (IVZ). We achieved higher resolution with respect to previous tomographic works covering the Western Alps, by processing seismic data collected by both permanent and temporary seismic networks (61 broad-band seismic stations in total). This included IvreaArray, a temporary, passive seismic experiment designed to investigate the IVZ crustal structure. Starting from continuous seismic ambient noise recordings, we measured and inverted the dispersion of the group velocity of surface Rayleigh waves (fundamental mode) in the period range 4–25 s. We obtained a new, 3-D vS model of the IVZ crust via the stochastic neighbourhood algorithm (NA), with the highest resolution between 3 to 40 km depth. The fast and shallow shear wave velocity anomaly associated with the IGB presents velocities of 3.6 km s−1 directly at the surface, in remarkable agreement with the location of the exposed lower-to-middle crustal and mantle outcrops. This suggests a continuity between the surface geological observations and the subsurface geophysical anomalies. The fast IGB structure reaches vS of 4 km s−1 at 20–25 km depth, at the boundary between the European and Adriatic tectonic plates, and in correspondence with the earlier identified Moho jump in the same area. The interpretation of a very shallow reaching IGB is further supported by the comparison of our new results with recent geophysical investigations, based on receiver functions and gravity anomaly data. By combining the new geophysical constraints and the geological observations at the surface, we provide a new structural interpretation of the IGB, which features lower crustal and mantle rocks at upper crustal depths. The comparison of the obtained vS values with the physical properties from laboratory analysis of local rock samples suggests that the bulk of the IGB consists of a combination of mantle peridotite, ultramafic and lower crustal rocks, bound in a heterogeneous structure. These new findings, based on vS tomography, corroborate the recent interpretation for which the Balmuccia peridotite outcrops are continuously linked to the IGB structure beneath. The new outcomes contribute to a multidisciplinary framework for the interpretation of the forthcoming results of the scientific drilling project DIVE. DIVE aims at probing the lower continental crust and its transition to the mantle, with two ongoing and one future boreholes (down to 4 km depth) in the IVZ area, providing new, complementary information on rock structure and composition across scales. In this framework, we constrain the upper crustal IGB geometries and lithology based on new evidence for vS, connecting prior crustal knowledge to recent active seismic investigations.
    Description: Published
    Description: 1089–1105
    Description: OST1 Alla ricerca dei Motori Geodinamici
    Description: JCR Journal
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  • 18
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    Metagenomic survey of the microbiome of ancient Siberian permafrost and modern Kamchatkan cryosols (2022)
    Oxford University Press
    In:  EPIC3microLife, Oxford University Press, 3(1), pp. 1-15, ISSN: 2633-6693
    Details
    Publication Date: 2024-01-30
    Description: In the context of global warming, the melting of arctic permafrost raises the threat of a re-emergence of microorganisms some of which were shown to remain viable in ancient frozen soils for up to half a million years. In order to evaluate this risk, it is of interest to acquire a better knowledge of the composition of the microbial communities found in this understudied environment. Here we present a metagenomics analysis of 12 soil samples from Russian Arctic and subarctic pristine areas: Chukotka, Yakutia, and Kamchatka, including 9 permafrost samples collected at various depths. These large datasets (9.2 1011 total bp) were assembled (525,313 contigs 〉 5kb), their encoded protein contents predicted, then used to perform taxonomical assignments of bacterial, archaeal, and eukaryotic organisms, as well as DNA viruses. The various samples exhibited variable DNA contents and highly diverse taxonomic profiles showing no obvious relationship with their locations, depths or deposit ages. Bacteria represented the largely dominant DNA fraction (95%) in all samples, followed by archaea (3.2%), surprisingly little eukaryotes (0.5%), and viruses (0.4%). Although no common taxonomic pattern was identified, the samples shared unexpected high frequencies of β-lactamase genes, almost 0.9 copy/bacterial genome. In addition of known environmental threats, the particularly intense warming of the Arctic might thus enhance the spread of bacterial antibiotic resistances, today's major challenge in public health. β-lactamases were also observed at high frequency in other types of soils, suggesting their general role in the regulation of bacterial populations.
    Repository Name: EPIC Alfred Wegener Institut
    Type: Article , isiRev
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  • 19
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    Implications for the geometry of plate boundaries in NE Asia based on the geodetic analysis of the 2020Mw 6.4 Koryak event (2024)
    Oxford University Press
    Details
    Publication Date: 2024-01-23
    Description: On the 9th of January 2020, an Mw 6.4 strike-slip earthquake took place north of the Asian margin of the Bering Sea. The earthquake occurred within the known reverse-right-lateral active fault zone, called Khatyrka–Vyvenka, which transverses the Koryak Highland from SE to NW and is thought to be a surface manifestation of the Asian portion of either the Bering plate boundary or the northern edge of the Alaskan stream. No other strong earthquake has ever been recorded in this remote uninhabited area and the few existing seismic stations provide poor quality earthquake locations.We adopt SAR interferometry (InSAR) technique to define an improved location of the Koryak 2020 earthquake and constrain the seismic source. The analysis of the 2020 event revealed a previously unknown active fault of left-lateral kinematics that is possibly hidden and strikes NWtransversely to the Khatyrka–Vyvenka fault zone. Although several mechanisms could account for left-lateral kinematics of this fault, we propose that the structure is part of a more extended NW fault structure, that formed in pre-neotectonic times and has played a role of a pre-existing rheological discontinuity. This revived NW structure together with a similar structure located easterly, so far aseismic, make the plate/stream boundary segmented, step-like in plan view. The step-like boundary geometry may be the result of internal transform deformation of a rigid plate, but it is better explained by deflections of the Alaskan stream edge at local crustal asperities, which are pre-Cenozoic terrains.
    Description: Published
    Description: 1412–1421
    Description: OST2 Deformazione e Hazard sismico e da maremoto
    Description: JCR Journal
    Keywords: Plate motion ; Radar interferometry ; Seismic cycle ; Asia
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 20
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    High frequency attenuation of S waves in alluvial deposits of the central Po Plain (northern Italy) (2024)
    Oxford University Press
    Details
    Publication Date: 2024-04-03
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2023. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: Estimation of local seismic response plays a key role in assessing local seismic hazard and particularly in the design of shaking scenarios. Modelling local seismic response involves knowing of the shear wave velocity (Vs) and quality factor (Qs) profiles for the site in question. The many techniques that have been developed to assess Vs in surface deposits produce reliable measurements of Vs , but these rarely correspond to direct measurements of Qs . The latter is often considered through damping measures from laboratory tests on small-scale soil samples, which can provide information primarily on intrinsic attenuation, neglecting the contribution of scattering effects. In this paper, using seismic recordings obtained at the surface and in boreholes at 100 m depth, we estimate an average value of Qs of some characteristic alluvial deposits of the Po Plain (northern Italy). Data come from a microseismic network which sampled an almost uniform lithology in the central Po Plain and consisted of three surface and four borehole stations with an interstation distance of about 2 km. The average value of Qs of the shallowest 100 m of the sedimentary strata, Qs100, is estimated by considering: (1) the high-frequency attenuation of seismic waves due to propagation through the corresponding stratigraphy and (2) the interference between incident and surface-reflected waves observed at borehole stations. We parametrize the first through k0_100, the difference between the values of the spectral decay parameter kappa (k) estimated at the surface and at the boreholes depth, respectively. We use the second in order to compute Vs100, the time-averaged Vs referred to the uppermost 100 m stratigraphy. We obtain: k0_100 = (11 ± 3) ms, Vs100 = (309 ± 11) m s −1 and Qs100 = 31 ± 10. At the surface, the estimated values of the site-specific kappa, k0, are found to range from 75 to 79 ms. As expected, these results are in good agreement with studies performed in other sites characterized by sandy or clayey lithologies, and can be usefully used in site response analysis at sites where the rigidity is mainly controlled by lithostatic pressure.
    Description: Comune di Minerbio (grant: “Sperimentazione ILG Minerbio”; grant number: 0913.010).
    Description: Published
    Description: 2075–2094
    Description: OST2 Deformazione e Hazard sismico e da maremoto
    Description: JCR Journal
    Keywords: Earthquake ground motions ; Seismic attenuation ; Site effects ; Wave propagation ; Wave scattering and diffraction ; 04.06. Seismology
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  • 21
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    Moment magnitude for earthquakes in the Etna volcano area (2024)
    Oxford University Press
    Details
    Publication Date: 2024-03-19
    Description: Accurate quantification of seismic activity in volcanic regions is an important asset for im- proving hazard and risk assessment. This is especially true for densely populated areas, as in the case of Etna volcano (Southern Italy). There, the volcanic hazard is amplified by the seismic risk of acti ve faults, especiall y on the eastern flank of the volcano. In such a context, it is common to rely on moment magnitude ( M W ) to characterize seismicity and monitor the energy released during an eruption. In this study, we calculate the moment-based magnitude ( M W ) for selected seismic data sets, using different approaches in distinct magnitude ranges to cover the widest possible range of magnitude that characterizes Etna’s seismicity . Specifically , we computed the M W from a data set of moment tensor solutions of earthquakes that occurred in the magnitude range 3.4 ≤M L ≤4.8 during 2005–2020; we created a data set of seismic moment and associated M W for earthquakes 1.0 ≤M L 〈 3.4 obtained by analysing source spectra; we fine-tuned two relationships, for shallow and deep earthquakes, to obtain M W from response spectra. Finally, we calibrated a specific relationship between M W and M L for the Etna area earthquakes in the range 1.0 ≤M L ≤4.8. All the empirical relationships obtained in this study can be applied in real-time analysis of the seismicity to provide fast and robust information on the released seismic energy.
    Description: INGV-DPC 2012- 2021 agreement; B2 DPC-INGV 2019-2021 project; IMPACT Department strategic project ; ‘Project PE0000005–RETURN (NRRP)
    Description: Published
    Description: 2520-2534
    Description: OST2 Deformazione e Hazard sismico e da maremoto
    Description: JCR Journal
    Keywords: Earthquak e source observations ; Earthquake hazards ; Time series analysis ; Full moment tensor
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 22
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    A statistical framework for detection of b-value anomalies in Italy (2024)
    Oxford University Press
    Details
    Publication Date: 2024-03-12
    Description: This study presents a new robust statistical framework, in which to measure relative differences, or deviations from a hypothetical reference value, of Gutenberg-Richter b-value. Moreover, it applies this method to recent seismicity in Italy, to find possible changes of earthquake magnitude distribution in time and space. The method uses bootstrap techniques, which have no prior assumptions about the distribution of data, keeping their basic features. Excluding Central Italy, no significative b-value variation is found, revealing that the frequency-magnitude distribution exponent is substantially stable or that data are not able to reveal hidden variations. Considering the small size of examined magnitude samples, we cannot definitively decide if the higher b-values in Central Italy, consistently founded by all applied tests, have a physical origin or result from a statistical bias. In any case, they indicate short-lived excursions which have a temporary nature and, therefore, cannot be associated solely to spatial variations in tectonic framework. Both the methodological issues and the results of the application to seismicity in Italy show that a correct assessing of b-value changes requests appropriate statistics, that accurately quantify the low accuracy and precision of b-value estimation for small magnitude samples.
    Description: Published
    Description: 729–740
    Description: OST4 Descrizione in tempo reale del terremoto, del maremoto, loro predicibilità e impatto
    Description: JCR Journal
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  • 23
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    Source mechanisms and induced seismicity in the Val d'Agri Basin (Italy) (2024)
    Oxford University Press
    Details
    Publication Date: 2024-03-12
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2023. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: We present the results from a fully unconstrained moment tensor inversion of induced seismic events in a complex and high seismic hazard region (Val d’Agri basin, Southern Italy). The study area hosts two well-documented cases of induced microseismicity linked to (i) a wastewater injection well of a giant oilfield (the largest in onshore Europe), and (ii) severe seasonal level changes of an artificial lake. In order to gather information on the non-doublecouple components of the source and to better understand the rupture mechanisms, we analyse seismic events recorded during daily injection tests in the disposal well. The computed moment tensors have significant non-double-couple components that correlate with the well-head injection pressure. The injection parameters strongly influence the rupture mechanism that can be interpreted as due to the opening/closing of a fracture network inside a fault zone of a pre-existing thrust fault. For the case of the reservoir-induced seismicity, no direct correlations are observed with the loading/unloading of the reservoir.
    Description: Published
    Description: 1617–1627
    Description: OST3 Vicino alla faglia
    Description: JCR Journal
    Keywords: 04.06. Seismology
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  • 24
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    Fabric controls fault stability in serpentinite gouges (2024)
    Oxford University Press
    Details
    Publication Date: 2024-04-09
    Description: Serpentinites are polymineralic rocks distributed almost ubiquitously across the globe in active tectonic regions. Magnetite-rich serpentinites are found in the low-strain domains of serpen- tinite shear zones, which act as potential sites of nucleation of unstable slip. To assess the potential of earthquake nucleation in these materials, we investigate the link between me- chanical properties and fabric of these rocks through a suite of laboratory shear experiments. Our experiments were done at room temperature and cover a range of normal stress and slip velocity from 25 to 100 MPa and 0.3 to 300 μm s −1 , respecti vel y. We show that magnetite-rich serpentinites are ideal materials since they display strong sensitivity to the loading rate and are susceptible to nucleation of unstable slip, especially at low forcing slip velocities. We also aim at the integration of mechanical and microstructural results to describe the underlying mechanisms that produce the macroscopic behaviour. We show that mineralogical composi- tion and mineral structure dictates the coexistence of two deformation mechanisms leading to stable and unstable slip. The weakness of phyllosilicates allows for creep during the interseis- mic phase of the laboratory seismic cycle while favouring the restoration of a load-bearing granular framework, responsible of the nucleation of unstable events. During dynamic slip, fault zone shear fabric determines the mode of slip, producing either asymmetric or Gaussian slip time functions for either fast or slow events. We report rate/state friction parameters and integrate our mechanical data with microstructural observations to shed light on the mech- anisms dictating the complexity of laborator y ear thquakes. We show that mineralogical and fabric heterogeneities control fault slip behaviour.
    Description: Published
    Description: 1778–1797
    Description: OST3 Vicino alla faglia
    Description: JCR Journal
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  • 25
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    Hydrological and volcano-related gravity signals at Mt. Somma–Vesuvius from ∼20 yr of time-lapse gravity monitoring: implications for volcano quiescence (2024)
    Oxford University Press
    Details
    Publication Date: 2024-05-27
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2023. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: We report on about 20 yr of relative gravity measurements, acquired on Mt. Somma–Vesuvius volcano in order to investigate the hydrological and volcano-tectonic processes controlling the present-day activity of the volcano. The retrieved long-term field of time gravity change (2003–2022) shows a pattern essentially related to the subsidence, which have affected the central part of the volcano, as detected by the permanent GNSS network and InSAR data. After reducing the observations for the effect of vertical deformation, no significant residuals are found, indicating no significant mass accumulation or loss within the volcanic system. In the north-western sector of the study area, at the border of the volcano edifice, however, significant residual positive gravity changes are detected which are associated to ground-water rebound after years of intense exploitation of the aquifers. On the seasonal timescale, we find that stations within the caldera rim are affected by the seasonal hydrological effects, while the gravity stations at the base of the Vesuvius show a less clear correlation. Furthermore, within the caldera rim a multiyear gravity transient is detected with an increase phase lasting about 4 yr followed by a slower decrease phase. Analysis of rain data seem to exclude a hydrological origin, hence, we hypothesize a deeper source related to the geothermal activity, which can be present even if the volcano is in a quiescent state. We infer the depth and volume of the source by inverting the spatial pattern of the gravity field at the peak of the transient. A volume of fluids of 9.5 × 107 m3 with density of 1000 kg m−3 at 2.3 km depth is capable to fit reasonably well the observations. To explain the gravity transient, simple synthetic models are produced, that simulate the ascent of fluids from a deep reservoir up to the depth of 2.3 km and a successive diffusion within the carbonate aquifer hosting the geothermal system. The whole process appears to not significantly affect the seismicity rate and the deformation of the volcano. This study demonstrates the importance of a 4-D gravity monitoring of a volcano to understand its complex gravity signals that cover different spatial and temporal scales. Discriminating the different contributions that mix up in the observed gravity changes, in particular those due to hydrologic/anthropogenic activities form those due to the geothermal dynamics, is fundamental for a complete and reliable evaluation of the volcano state.
    Description: Published
    Description: 1565–1580
    Description: OSV2: Complessità dei processi vulcanici: approcci multidisciplinari e multiparametrici
    Description: JCR Journal
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  • 26
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    Comparison between alarm-based and probability-based earthquake forecasting methods (2024)
    Oxford University Press
    Details
    Publication Date: 2024-05-09
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2023. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: In a recent work, we applied the every earthquake a precursor according to scale (EEPAS) probabilistic model to the pseudo-prospective forecasting of shallow earthquakes with magni- tude M 5.0 in the Italian region. We compared the forecasting performance of EEPAS with that of the epidemic type aftershock sequences (ETAS) forecasting model, using the most recent consistency tests developed within the collaboratory for the study of earthquake predictabil- ity (CSEP). The application of such models for the forecasting of Italian target earthquakes seems to show peculiar characteristics for each of them. In particular, the ETAS model showed higher performance for short-term forecasting, in contrast, the EEPAS model showed higher forecasting performance for the medium/long-term. In this work, we compare the performance of EEPAS and ETAS models with that obtained by a deterministic model based on the occur- rence of strong foreshocks (FORE model) using an alarm-based approach. We apply the two rate-based models (ETAS and EEPAS) estimating the best probability threshold above which we issue an alarm. The model parameters and probability thresholds for issuing the alarms are calibrated on a learning data set from 1990 to 2011 during which 27 target earthquakes have occurred within the analysis region. The pseudo-prospective forecasting performance is as- sessed on a validation data set from 2012 to 2021, which also comprises 27 target earthquakes. Tests to assess the forecasting capability demonstrate that, even if all models outperform a purely random method, which trivially forecast earthquake proportionally to the space–time occupied by alarms, the EEPAS model exhibits lower forecasting performance than ETAS and FORE models. In addition, the relative performance comparison of the three models demonstrates that the forecasting capability of the FORE model appears slightly better than ETAS, but the difference is not statistically significant as it remains within the uncertainty level. However, truly prospective tests are necessary to validate such results, ideally using new testing procedures allowing the analysis of alarm-based models, not yet available within the CSEP.
    Description: Published
    Description: 1541–1551
    Description: OST4 Descrizione in tempo reale del terremoto, del maremoto, loro predicibilità e impatto
    Description: JCR Journal
    Keywords: Computational seismology ; Earthquake interaction, forecasting and prediction ; Statistical seismology ; Comparison betwee earthquake forecasting methods
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 27
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    Low-strength shear zone in the western Makran subduction zone, southeastern Iran: insights from a receiver function analysis (2024)
    Oxford University Press
    Details
    Publication Date: 2024-05-09
    Description: To understand the seismic hazard of a subduction zone, it is necessary to know the geometry, location and mechanical characteristics of the interplate boundary below which an oceanic plate is thrust downward. By considering the azimuthal dependence of converted P-to-S (Ps) amplitudes in receiver functions, we have detected the interplate boundary in the Makran subduction zone, revealing significant seismic anisotropy at the base of the accretionary wedge above the slab before it bends down beneath the Jaz Murian basin. This anisotropic feature aligns with a zone of reduced seismic velocity and a high primary/secondary wave velocity ratio (Vp/Vs), as documented in previous studies. The presence of this low-velocity highly anisotropic layer at the base of the accretionary wedge, likely representing a low-strength shear zone, could possibly explain the unusually wide accretionary wedge in Makran. Additionally, it may impact the location and width of the locked zone along the interplate boundary.
    Description: Iranian National Science Foundation (INSF)
    Description: Published
    Description: 64-74
    Description: OST1 Alla ricerca dei Motori Geodinamici
    Description: JCR Journal
    Keywords: Earthquake hazards, Seismic anisotropy, Crustal structure, Subduction zone processes ; 04.06. Seismology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Application of the EEPAS earthquake forecasting model to Italy (2024)
    Oxford University Press
    Details
    Publication Date: 2024-05-09
    Description: This article has been accepted for publication in Geophysical Journal International ©:The Author(s) 2023. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.Uploaded in accordance with the publisher's self-archiving policy. All rights reserved.
    Description: The Every Earthquake a Precursor According to Scale (EEPAS) forecasting model is a space– time point-process model based on the precursory scale increase (ψ ) phenomenon and associated predictive scaling relations. It has been previously applied to New Zealand, Cal- ifornia and Japan earthquakes with target magnitude thresholds varying from about 5–7. In all previous application, computations were done using the computer code implemented in Fortran language by the model authors. In this work, we applied it to Italy using a suite of computing codes completely rewritten in Matlab. We first compared the two software codes to ensure the convergence and adequate coincidence between the estimated model parameters for a simple region capable of being analysed by both software codes. Then, using the rewritten codes, we optimized the parameters for a different and more complex polygon of analysis using the Homogenized Instrumental Seismic Catalogue data from 1990 to 2011. We then perform a pseudo-prospective forecasting experiment of Italian earthquakes from 2012 to 2021 with Mw ≥ 5.0 and compare the forecasting skill of EEPAS with those obtained by other time in- dependent (Spatially Uniform Poisson, Spatially Variable Poisson and PPE: Proximity to Past Earthquakes) and time dependent [Epidemic Type Aftershock Sequence (ETAS)] forecasting models using the information gain per active cell. The preference goes to the ETAS model for short time intervals (3 months) and to the EEPAS model for longer time intervals (6 months to 10 yr).
    Description: Published
    Description: 1681–1700
    Description: OST4 Descrizione in tempo reale del terremoto, del maremoto, loro predicibilità e impatto
    Description: JCR Journal
    Keywords: Computational seismology ; Earthquake interaction ; forecasting and prediction ; Statistical seismology ; Earthquake forecasting
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    The Influence of Undercooling and Sector Zoning on Clinopyroxene–Melt Equilibrium and Thermobarometry (2024)
    Oxford University Press
    Details
    Publication Date: 2024-06-17
    Description: Thermobarometry provides a critical means of assessing locations of magma storage and dynamics in the lead-up to volcanic eruptions and crustal growth. A common approach is to utilise minerals that have compositions sensitive to changes in pressure and/or temperature, such as clinopyroxene, which is ubiquitous in mafic to intermediate magmas. However, clinopyroxene thermobarometry may carry significant uncertainty and require an appropriate equilibrium melt composition. In addition, the degree of magma undercooling (ΔT) affects clinopyroxene composition and zoning, with common sector zoning potentially obfuscating thermobarometry results. Here, we use a set of crystallisation experiments on a primitive trachybasalt from Mt. Etna (Italy) at ΔT = 25–233 °C, P = 400–800 MPa, H2O = 0–4 wt % and fO2 = NNO + 2, with clinopyroxene crystals defined by Al-rich zones (prisms and skeletons) and Al-poor zones (hourglass and overgrowths) to assess common equilibrium models and thermobarometric approaches. Under the studied conditions, our data suggest that the commonly applied Fe–Mg exchange (cpx-meltKdFe–Mg) is insensitive to increasing ΔT and may not be a reliable indicator of equilibrium. The combined use of DiHd (CaMgSi2O6 + CaFeSi2O6) and EnFs (Mg2Si2O6 + Fe2Si2O6) models indicate the attainment of equilibrium in both Al-rich and Al-poor zones for almost all investigated ΔT. In contrast, CaTs (CaAl2SiO6) and CaTi (CaTiAl2O6) models reveal substantial deviations from equilibrium with increasing ΔT, particularly in Al-rich zones. We postulate that this reflects slower diffusion of Al and Ti in the melt compared with Ca and Mg and recommend the concurrent application of these four models to evaluate equilibrium between clinopyroxene and melt, particularly for sector-zoned crystals. Thermobarometers calibrated with only isothermal–isobaric experiments closely reproduce experimental P–T at low ΔT, equivalent to natural phenocrysts cores and sector-zoned mantles. Models that also consider decompression experiments are most accurate at high ΔT and are therefore suitable for outermost phenocryst rims and groundmass microlites. Recent machine learning approaches reproduce P–T conditions across all ΔT conditions. Applying our experimental constraints to sector-zoned microphenocrysts and groundmass microlites erupted during the 1974 eccentric eruption at Mt. Etna, we highlight that both hourglass and prism sectors are suitable for thermobarometry, given that equilibrium is sufficiently tested for. The combination of DiHd, EnFs, CaTs and CaTi models identifies compositions closest to equilibrium with the bulk melt composition, and results in smaller differences in P–T calculated for hourglass and prism sectors compared with applying only DiHd and EnFs equilibrium models. This provides a framework to assess crystallisation conditions recorded by sector-zoned clinopyroxene crystals in mafic alkaline settings.
    Description: Published
    Description: egad074
    Description: OSV2: Complessità dei processi vulcanici: approcci multidisciplinari e multiparametrici
    Description: JCR Journal
    Keywords: Experimental Petrology ; Petrology ; Clinopyroxene ; Thermobarometry ; Experimental Petrology
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Mass-change And Geosciences International Constellation (MAGIC) expected impact on science and applications (2024)
    Oxford University Press
    Details
    Publication Date: 2024-07-02
    Description: The joint ESA/NASA Mass-change And Geosciences International Constellation (MAGIC) has the objective to extend time-series from previous gravity missions, including an improvement of accuracy and spatio-temporal resolution. The long-term monitoring of Earth’s gravity field carries information on mass change induced by water cycle, climate change and mass transport processes between atmosphere, cryosphere, oceans and solid Earth. MAGIC will be composed of two satellite pairs flying in different orbit planes. The NASA/DLR-led first pair (P1) is expected to be in a near-polar orbit around 500 km of altitude; while the second ESA-led pair (P2) is expected to be in an inclined orbit of 65°–70° at approximately 400 km altitude. The ESA-led pair P2 Next Generation Gravity Mission shall be launched after P1 in a staggered manner to form the MAGIC constellation. The addition of an inclined pair shall lead to reduction of temporal aliasing effects and consequently of reliance on de-aliasing models and post-processing. The main novelty of the MAGIC constellation is the delivery of mass-change products at higher spatial resolution, temporal (i.e. subweekly) resolution, shorter latency and higher accuracy than the Gravity Recovery and Climate Experiment (GRACE) and Gravity Recovery and Climate Experiment Follow-On (GRACE-FO). This will pave the way to new science applications and operational services. In this paper, an overview of various fields of science and service applications for hydrology, cryosphere, oceanography, solid Earth, climate change and geodesy is provided. These thematic fields and newly enabled applications and services were analysed in the frame of the initial ESA Science Support activities for MAGIC. The analyses of MAGIC scenarios for different application areas in the field of geosciences confirmed that the double-pair configuration will significantly enlarge the number of observable mass-change phenomena by resolving smaller spatial scales with an uncertainty that satisfies evolved user requirements expressed by international bodies such as IUGG. The required uncertainty levels of dedicated thematic fields met by MAGIC unfiltered Level-2 products will benefit hydrological applications by recovering more than 90 per cent of the major river basins worldwide at 260 km spatial resolution, cryosphere applications by enabling mass change signal separation in the interior of Greenland from those in the coastal zones and by resolving small-scale mass variability in challenging regions such as the Antarctic Peninsula, oceanography applications by monitoring meridional overturning circulation changes on timescales of years and decades, climate applications by detecting amplitude and phase changes of Terrestrial Water Storage after 30 yr in 64 and 56 per cent of the global land areas and solid Earth applications by lowering the Earthquake detection threshold from magnitude 8.8 to magnitude 7.4 with spatial resolution increased to 333 km.
    Description: Published
    Description: 1288–1308
    Description: JCR Journal
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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    Electronic Resource
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    Brand alliance dependency and exclusivity: an empirical investigation (2004)
    Bingley : Emerald
    The @journal of product & brand management 13 (2004), S. 477-487 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: This paper examines the effects of resource dependency and contract exclusivity on the attitudes and intentions of consumers in brand alliances. Findings indicate that attitudes of the brands before the alliance (pre-attitudes) have a positive effect on the attitude toward the alliance, which has a positive effect on perceived quality of the alliance, willingness to pay a premium price and purchase intention. Further, attitudes toward the brands after the alliance (post-attitudes) reveal a positive spillover effect for both the host and ally brands. Interestingly, the moderating effects of dependency and exclusivity differ based on whether the brand serves as the host or the ally brand in the alliance. Analyses conducted after controlling for the effects of familiarity of the ally brands revealed consistent results.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420410568417
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  • 32
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    Building brand loyalty through individual stock ownership (2004)
    Bingley : Emerald
    The @journal of product & brand management 13 (2004), S. 488-497 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Building brand loyalty has become more important, yet more difficult to achieve in today's marketplace. This research investigates a possible avenue for building brand loyalty that is not directly related to the marketing of the product - attracting individual investors in the brand's corporate parent. A survey of over 500 individual investors revealed that individual investors do tend to buy brands from companies in which they hold stock, and investors may buy stock in a company because they have experience with the brand. In contrast with brand loyalty, where consumers will not buy competitive offerings, individual investors indicated they would buy competitive offerings, suggesting that stock ownership is more likely to lead to repeat purchase behavior, but not brand loyalty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420410568426
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    The impact of e-mail marketing on brand loyalty (2004)
    Bingley : Emerald
    The @journal of product & brand management 13 (2004), S. 498-505 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: The study examines the effects of e-mail marketing on brand loyalty and also reveals the kinds of e-mail content valued by consumers. Data were gathered from 890 consumers, who were users of a multinational cosmetics brand and had received regular permission-based e-mail messages from the marketer. Results reveal that regular e-mail marketing has positive effects on brand loyalty. E-mail-activated consumers visited retail stores. Consumers exposed to e-mail marketing recommended the brand to their friends. Loyal customers appreciated regular communication and various other information content from the brand more than mere offers. These results encourage marketers to keep in frequent contact with customers via e-mail with the aim of enhancing brand loyalty.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420410568435
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  • 34
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    Evaluating potential brand associations through conjoint analysis and market simulation (2004)
    Bingley : Emerald
    The @journal of product & brand management 13 (2004), S. 506-513 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: A novel method for evaluating the benefits of a potential brand association is presented. The uniqueness of the method is considering brand association as just another product attribute, subject to the usual analysis used to determine the attributes desired by consumers in a new product. The method was illustrated using automobile tires as the product, and designation of the tire as the "Official" tire of NASCAR as the brand association. A set of tire profiles was created, describing hypothetical tires as combinations of levels of five attributes. Subjects ranked these profiles for preference, and this preference was decomposed through conjoint analysis to yield part-worths for each attribute level for each subject. Association with NASCAR had an average impact of 14.8 percent on consumer preference, comparable with that of speed rating (13.8 percent), and not much below that of brand (20.5 percent). Rudimentary market simulation suggested that associating the underdog tire brand with NASCAR would result in dramatically improved market share. Evaluating potential brand associations by their simulated effects on market share may be a useful managerial tool.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420410568444
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  • 35
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    Influence of price endings on price recall: a by-digit analysis (2004)
    Bingley : Emerald
    The @journal of product & brand management 13 (2004), S. 514-524 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Although it has been proposed that recall processes play a role in the retail sales effects of 9-ending pricing, substantial effects of price endings on the level of recalled prices has not been demonstrated. With an improved testing procedure, it is found that the level of a set of prices with low ending digits (such as 1 or 2 in the dollars place) is more likely to be overestimated in recall than the level of equivalent sets of prices with high ending digits (such as 6, 7, or 9 in the dollars place). The results of the study support the role of left-to-right processing of price information and point out some consequences for retailers of the use of low numbers in price-ending digits.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420410568453
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  • 36
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    Price-tier competition: an integrative review (2000)
    Bingley : Emerald
    The @journal of product & brand management 9 (2000), S. 276-297 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: The nature of competition between different tiers (e.g. high-tier vs low-tier brands) has become an important research domain for academic researchers and marketing managers. Although research on inter-tier competition is growing at an increasing rate, there has not been a comprehensive attempt to summarize the research in this stream. The objective of this article is to synthesize the research on inter-tier competition, extract the key findings, discuss managerial implications, and offer future research directions.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420010347083
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  • 37
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    Using quantitative models for setting retail prices (2000)
    Bingley : Emerald
    The @journal of product & brand management 9 (2000), S. 304-320 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Products that have a short selling season face high uncertainty in demand. Retailers who sell such products therefore find the task of pricing and inventory challenging. Many retailers consider making these decisions as an art form and do not use quantitative models that are developed by researchers. Describes how retailers typically make pricing and inventory decisions and also reviews quantitative models that have been developed by researchers to improve on one or more of these decisions. A classification of these models is developed and how they can assist the retailer is explained. A simple explanation of two mathematical tools, Bayesian updating of information and dynamic programming, which are commonly mentioned in the literature are also given.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420010347100
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  • 38
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    The measurement and dimensionality of brand associations (2000)
    Bingley : Emerald
    The @journal of product & brand management 9 (2000), S. 350-370 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: The purpose of the research reported here was to test empirically a conceptualization of brand associations that consists of three dimensions: brand image, brand attitude and perceived quality. A better understanding of brand associations is needed to facilitate further theoretical development and practical measurement of the construct. Three studies were conducted to: test a protocol for developing product category specific measures of brand image; investigate the dimensionality of the brand associations construct; and explore whether the degree of dimensionality of brand associations varies depending upon a brand's familiarity. Findings confirm the efficacy of the brand image protocol and indicate that brand associations differ across brands and product categories. The latter finding supports the conclusion that brand associations for different products should be measured using different items. As predicted, dimensionality of brand associations was found to be influenced by brand familiarity.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420010356966
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  • 39
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    Advertising vs sales promotion: a brand management perspective (2000)
    Bingley : Emerald
    The @journal of product & brand management 9 (2000), S. 389-414 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Brand managers in packaged goods firms are under pressure to increase or maintain high sales promotion spending at the expense of media advertising. This study investigates the antecedents and outcomes of brand managers' advertising and sales promotion budget allocations by adopting a bounded rationality perspective. Based on survey data collected from 165 brand managers in the USA, higher advertising (vs sales promotion) allocations are associated with: single, relatively high priced brands in the early phases of the product life cycle; and more experienced brand managers who are subject to less retail influence. Also, brands with higher budget allocations to advertising, relative to sales promotion, tend to have more favorable consumer attitudes, stronger brand equity, and higher market share increases and profits. Managerial implications and areas for future study are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420010356984
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  • 40
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    Consumer perceptions of generic products: a Mexican study (2000)
    Bingley : Emerald
    The @journal of product & brand management 9 (2000), S. 446-456 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Previous research studies on generic products focus mainly on mature markets such as the USA. These studies measure consumer perceptions of all generic products as a whole, with respect to price and quality. With the passing of the NAFTA, retailers' interest in the relatively young Mexican market has increased. The purpose of this study is to determine Mexican consumers' overall perceptions of generic grocery products, to examine if there are any differences in perception across demographic groups and to determine if there are differences in the perception of generic products across product categories. Two variables were examined: risk perception of generic products and satisfaction with generic products.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420010351385
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  • 41
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    Toward effective use of cause-related marketing alliances (2000)
    Bingley : Emerald
    The @journal of product & brand management 9 (2000), S. 472-484 
    Details
    ISSN: 1061-0421
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Economics
    Notes: Companies have become increasingly active in developing relationships between their brands and popular causes in such areas as the environment (e.g. nature conservancy) and health issues (e.g. breast cancer awareness crusade). As such alliances become a more important strategic component of the brand's marketing mix, managers seek direction as to how to generate the most impact with these tie-ins. This article uses associative learning principles as a framework for understanding how to facilitate building connections between brands and causes so as to increase the value of this highly visible marketing activity. Specific associative learning principles are detailed and applied, improving the use of cause-related marketing alliances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10610420010351394
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  • 42
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    Home with ET - Elsik technology (2000)
    Bradford : Emerald
    Campus-wide information systems 17 (2000), S. 129-133 
    Details
    ISSN: 1065-0741
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: This article profiles the technology-rich environment at Elsik High School in the Alief Intermediate School District on the west side of Houston. The district's $16 million commitment to technology by 2001 is explored. The instructional benefits are featured by departments with a basic outline as to what students are doing in a strong instructional program that is technology-based. Implementation ideas by departments are demonstrated from the art department to the sciences and social studies. After departments are highlighted, the technology available to the administrators, teachers, and staff is showcased. Online technologies, video distribution, and video conferencing are discussed. All of the technological tools and implementation of these tools into and across the curriculum demonstrate Elsik High School's commitment to integrate technology into each and every classroom to better prepare students for the new millenium.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10650740010350873
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  • 43
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    Diversified use of ICT in education (2000)
    Bradford : Emerald
    Campus-wide information systems 17 (2000), S. 161-166 
    Details
    ISSN: 1065-0741
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: The Fachhochschule JOANNEUM (FH JOANNEUM), a university of applied science, founded the Centre for Multimedia and Learning (CML) in 1998, in order to provide support for lecturers in implementing computer-supported learning strategies within their classes. Now, after two years of work and different approaches applied, the CML has developed a strategy which promises a sustainable development for the highly diversified courses offered at the university. Within this article, evaluation results of three different approaches are described and the future strategy of a bottom-up approach is outlined. Based on the results, an in-house training program for the teaching staff has been developed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10650740010360520
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  • 44
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    Selecting the neural network topology for student modelling of prediction of corporate bankruptcy (2001)
    Bradford : Emerald
    Campus-wide information systems 18 (2001), S. 13-22 
    Details
    ISSN: 1065-0741
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Neural network topology selection refers to a systematic procedure for selecting between competing models. Naturally, it is regarded as a key aspect in optimisation and replicability of neural network performance. When constructing neural network topologies, it is necessary to determine from the outset the general taxonomy of the neural network architectures to be constructed. The taxonomy considered in this study is the general taxonomy of time-varying patterns which subsumes many existing architectures in the literature and points to several promising neural network architectures that have yet to be examined. The context of the problem is that choosing the right neural network topology for use in a particular domain such as corporate bankruptcy prediction with optimum generalisation performance is not, in any case, a trivial problem. The results of experiments presented in this paper would serve as a baseline against which to select between two competing architectures.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10650740110364390
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  • 45
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    ActiveBook: a framework for optimizing Internet technologies in education (2001)
    Bradford : Emerald
    Campus-wide information systems 18 (2001), S. 28-42 
    Details
    ISSN: 1065-0741
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: This paper describes several problems with the current Internet technologies and the way they are currently utilized in education and proposes an innovative solution. First, the paper discusses an activity matrix that maps learning activities involved in business education along two dimensions: level of monitoring and level of interaction. The paper then proposes a unifying framework that utilizes emerging Internet technologies to support these learning activities. The framework goes beyond a simple piece of software at the client level to provide a complete solution with the student client, the instructor client and the server level software. Furthermore, the paper describes the architecture, features and specific technologies used in an actual education support system developed from the framework.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10650740110364417
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  • 46
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    Experiences with multiskilling among non-union craft workers in US industrial construction projects (2003)
    Oxford : Emerald
    Engineering, construction and architectural management 10 (2003), S. 374-381 
    Details
    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Multiskilling refers to a labour utilization strategy in which workers learn multiple skills in one or more trades outside of their primary trade. Over 700 non-union craft workers across the USA were surveyed as part of a research effort. The data collected show that a slight increase in the breadth of skills positively impacts a worker's hourly wage, but only a weak relationship was found between multiskilling and more continuous employment.
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    URL: http://dx.doi.org/10.1108/09699980310509345
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    Dilettantes, discipline and discourse: requirements management for construction (2003)
    Oxford : Emerald
    Engineering, construction and architectural management 10 (2003), S. 354-367 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Requirements management (RM), as practised in the aerospace and defence sectors, attracts interest from construction researchers in response to longstanding problems of project definition. Doubts are expressed whether RM offers a new discipline for construction practitioners or whether it repeats previous exhortations to adopt a more disciplined way of working. Whilst systems engineering has an established track record of addressing complex technical problems, its extension to socially complex problems has been challenged. The dominant storyline of RM is one of procedural rationality and RM is commonly presented as a means of controlling dilettante behaviour. Interviews with RM practitioners suggest a considerable gulf between the dominant storyline in the literature and how practitioners operate in practice. The paper challenges construction researchers interested in RM to reflect more upon the theoretical debates that underpin current equivalent practices in construction and the disparity between espoused and enacted practice.
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    URL: http://dx.doi.org/10.1108/09699980310502964
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    Knowledge management in consulting engineering - joining IT and human resources to support the production of knowledge (2003)
    Oxford : Emerald
    Engineering, construction and architectural management 10 (2003), S. 391-401 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This article discusses how information technology and human resource oriented management tools can be integrated using their respective strengths to enable knowledge production. Two companies' KM strategies encompassing a strong IT-component in combination with organisation, training and office design are analysed. Their experience shows that joining information technology with the human resource oriented tools is a necessary precondition for success in KM-efforts. Second, in the large company, there is still a relative overemphasis on "circumstantial" frames for knowledge production and too little focus on dynamics in knowledge producing processes. In contrast, the medium sized company is experimenting with soft tools used directly in the processes of the customer-oriented projects.
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    URL: http://dx.doi.org/10.1108/09699980310509363
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    Application of the analytic hierarchy process to prioritise irrigation asset renewals: the case of the La Khe irrigation scheme, Vietnam (2003)
    Oxford : Emerald
    Engineering, construction and architectural management 10 (2003), S. 382-390 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: In recent years, many organisations responsible for economic infrastructure have developed asset management systems to improve the financial and service performance of their facilities. Asset management is an integrated approach to improving the ability of an irrigation system to deliver water at a defined level of service in the most cost-effective manner. This paper describes how the analytic hierarchy process (AHP) is applied to identify priorities for asset renewals in the La Khe irrigation scheme in North Vietnam. The AHP methodology was coupled with the expected maximum utility (EMU) to evaluate renewal priorities of assets grouped by types and by location within the hydraulic system.
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    URL: http://dx.doi.org/10.1108/09699980310509354
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    Marketing and architects in South Africa (2003)
    Oxford : Emerald
    Engineering, construction and architectural management 10 (2003), S. 402-412 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: There is a general sentiment against the idea of marketing among architectural professionals. This paper argues for the necessity of a marketing approach particularly in times where the workload is declining. This paper looks at the marketing strategies that the Western Cape architects follow. It examines their efforts in building a successful marketing portfolio that defines marketing targets, utilizes proper marketing tools, and carry on helpful image building tasks. The data were collected using a mailed questionnaire to all principals of architectural offices in the Western Cape Province. The concluding section relates these strategies with the perception of growth over a five-year period.
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    URL: http://dx.doi.org/10.1108/09699980310509372
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    Rule induction in productivity analysis: a rough set approach (2003)
    Oxford : Emerald
    Engineering, construction and architectural management 10 (2003), S. 413-417 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper describes the application of rough set theory to equipment productivity estimate. Rough set theory offers a novel approach both in generation of rules and statistical classification of the equipment productivity data. The approach is based on upper and lower approximations of a set in terms of positive, negative and boundary regions. The information about the equipment productivity is organized in productivity information table. The table contains data about the object of interest characterized in terms of some attributes. The paper is more of an exploratory research to determine how rough set theory can be applicable to specific construction engineering problems.
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    URL: http://dx.doi.org/10.1108/09699980310509381
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    Applications of value management in the construction industry in China (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 9-19 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Value management (VM) was introduced in China during 1978, when the reform and open door policy started. After a surge of VM applications that emerged in the late 1980s, the development of VM has declined sharply in the recent years in China. Although some successful applications of VM in China's construction industry have been observed, many actions should be taken to exert its full potential to improve value for money for clients. Aims to draw a holistic picture of the current VM practices and provide recommendations for its future development in China's construction industry. Provides a comparison between China's VM approach and the international mainstream to highlight the major differences.
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    URL: http://dx.doi.org/10.1108/09699980410512629
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    Targeting optimum value in public sector projects through "best value"-focused contractor selection (2003)
    Oxford : Emerald
    Engineering, construction and architectural management 10 (2003), S. 418-431 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Procuring best value should be one of the key objectives in public sector construction projects. Best value depends upon sound "selection" strategies which ensure that the outlined project procurement objectives, including client/user demands are met. Examples of "best value" procurement are presented to demonstrate their usefulness and acceptance in principle. Further conceptualizations of various aspects of best value and the "dominance vectors" influencing the ultimate value definitions are developed, in accordance with basic public sector procurement principles. Presents a structured best value based contractor selection framework to optimize realizable value in public sector construction projects.
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    URL: http://dx.doi.org/10.1108/09699980310509390
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    Sequencing problems in methods of organising construction processes (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 20-32 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper presents the algorithm of construction work graphic schedule which considers the proper sequencing problem. Describes the algorithm step by step, i.e. the construction work organisation methods with zero couplings between realisation means, work fronts, and their combination. It also shows the calculation process of limit possible minimum by considering technical and organisation limits. In the second part of the paper, the practical example which shows the method and the optimisation algorithm for the work organisation method with zero couplings between realisation means is presented.
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    URL: http://dx.doi.org/10.1108/09699980410512638
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    Psychological contract expectations of construction project managers (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 33-44 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The past 20 years have seen a period of fundamental change for many construction businesses as they have restructured, downsized, de-layered, merged and de-merged to survive turbulent markets and rapidly changing demand cycles. Such change places significant new pressures, challenges and constraints on the employer/employee relationship. This paper argues that these changes are likely to have reconstituted employee expectations of the less formal aspects of the employment relationship, known collectively as the psychological contract. Explores this inductive research which examines the psychological contract of 30 construction project managers.
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    URL: http://dx.doi.org/10.1108/09699980410512647
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    How important is cooperation to construction project success? A grounded empirical quantification (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 45-54 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Cooperation is generally purported to be vital to construction project success. However, there has been, as yet, no empirical work done to quantify explicitly the extent to which cooperation, in relation to other factors, determines construction project success. This study attempts to fill this research gap. This paper details a grounded empirical approach to identify important construction success factors using data from 29 interviews, 398 quantitative response and six follow-up interviews from construction firms in Hong??Kong. Results show how using the grounded approach enables the tapping of unique determinants of project success previously not identified in the literature and point to a potentially fruitful approach for future research in construction management.
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    URL: http://dx.doi.org/10.1108/09699980410512656
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    Planning, estimation and productivity in the lean concrete pour (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 55-64 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: With an increasingly competitive global market, the UK construction industry finally realised that in order to survive, a marked increase in efficiency and effectiveness have to be achieved in all areas. This paper will describe the UK's approach to planning and designing the concrete operations that form a major part of many civil engineering construction projects. A productivity study has been carried out on three different construction projects and over 200 concrete pours have been observed. The data and knowledge collected on site have been subjected to lean construction philosophies, producing a "lean" measure of productivity, and it has been shown that major productivity increases could be achieved by implementing several relatively simple principles.
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    URL: http://dx.doi.org/10.1108/09699980410512665
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    The impact of mergers and acquisitions on shareholder wealth in the UK construction industry (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 65-73 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: One of the primary motives behind any strategic corporate decision is to maximise shareholder value. Strategic decisions for UK construction firms are made with the objective of maximising the wealth of the company's shareholders. This paper investigates the financial performance of UK construction companies, which have been involved in construction related mergers and acquisitions and examines the impact of merger announcements on acquiring firms' and target firms' stock performance in the UK construction industry. It also examines abnormal share returns throughout a period surrounding the announcement of both successful and unsuccessful acquisition and merger bids. The overall results indicate that related construction mergers create wealth for shareholders of the target firms.
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    URL: http://dx.doi.org/10.1108/09699980410512674
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    Site layout for earthworks in road projects (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 83-89 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper describes the integration of various models to provide a realistic decision support system for linear project site layout. Initially, the paper describes an investigation to determine the actual methods currently used by project managers and planners. A review of both techniques adopted by the managers and the knowledge acquisition methods employed are included in the paper. Following this, this paper describes the work done to automate the existing systems. This resulted in a system which has been used in practice and has been shown to be a great help to managers. It is based on the traditional method of mass-haul diagrams used to determine the earthworks activities. A separate simulation and artificial intelligence model of earthworks are described. This will be extended to model linear projects more realistically than does mass-haul.
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    URL: http://dx.doi.org/10.1108/09699980410527885
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    Negotiation and resolution of conflict using AHP: an application to project management (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 90-100 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The subject of Conflict-Analysis and Resolution has received considerable attention in construction management. Providing measurement to tangibles and intangibles issues, involved in a conflict is not attempted often. The quantification of the perception of gains and losses for the parties involved in a conflict helps to analyze the issues scientifically, in a more logical manner. This paper presents the application of a decision-making methodology, the analytical hierarchy process (AHP), to conflict management. The objective of this paper is analyzing and resolving conflict aided by the quantification of gains and losses using the AHP. This methodology was applied to a real conflict situation between two government agencies in Kuwait.
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    URL: http://dx.doi.org/10.1108/09699980410527894
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    Optimising the design of sewer networks using genetic algorithms and tabu search (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 101-112 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper describes the application of heuristic techniques for designing gravity wastewater collection systems. Designing sewer networks can be a time-consuming task that is largely based on trial and error where suitable pipe diameters and slopes combinations for all pipelines between manholes must be identified. Since there is a large range of possible slopes, diameters and roughness coefficients of pipes, only a small number of combinations of these parameters are usually analyzed in traditional design processes. Identifying a minimum cost design is an important issue when constructing sewer networks. In this paper, genetic algorithms and tabu search techniques are implemented to solve this difficult optimization problem. An adaptive rule and a dynamic search strategy were developed to assist the search procedures find better solutions.
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    URL: http://dx.doi.org/10.1108/09699980410527849
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    Impact of construction materials on project time and cost in Kuwait (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 126-132 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The construction of residential projects constitutes a major portion of the building activities in the State of Kuwait. This paper presents the findings of a research project, which aims to determine the causes of delays and cost-overruns in the construction of housing projects in Kuwait. The owners of 450 residential projects (just completed or near completion), spread over 27 systematic-randomly selected metropolitan districts, were personally interviewed. Data on owners' socio-demographic traits and project characteristics, including those involving time and cost overruns, were obtained. The paper highlights the impacts of construction materials on time-delays and cost-increases. Project-related variables affecting the on-time delivery of materials to the construction site are examined and quantified. The material selection-time, type of materials, their availability in the local market and the presence of a supervising engineer, all demonstrated a statistically significant impact on the on-time delivery of materials to construction sites.
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    URL: http://dx.doi.org/10.1108/09699980410527867
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    Empowering collaborative decisions in complex construction project scenarios (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 133-142 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Diverse construction project stakeholders demand "fully-informed" and well-balanced decisions that target multiple objectives appropriately. This paper introduces initiatives into the development of a cluster of information and communication technology-artificial intelligence supported empowerment systems and sub-systems. Examples presented include conceptual models and/or descriptions of: the framework of an over-arching management support system (MSS); multi-agent support for improved collaborative working in: design development and relationally integrated supply chain management; and web-based quality management.
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    URL: http://dx.doi.org/10.1108/09699980410527876
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    Factors influencing project delivery within construction clients' multi-project environments (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 113-125 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The single project paradigm which dominates the literature of both project and construction management research does not accurately reflect the reality of many construction clients, who have large ongoing construction portfolios rather than one-off construction projects. Although several concepts of multi-project environments (MPEs) exist, an investigation of the form and dynamic interactions of components within MPEs of construction clients was lacking. This paper presents the factors identified as exerting greatest influence on project delivery within construction clients' MPEs.
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    URL: http://dx.doi.org/10.1108/09699980410527858
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    Evaluating engineering consultants' general capabilities during the pre-selection process - a Hong Kong study (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 150-158 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Consultant pre-selection is an essential process to distinguish capable candidates before they are invited to submit their technical and fee proposals for consultancy assignments. Despite that, many clients have their own criteria and emphasis, and this could result in discrepancies in pre-selection decisions. The aim of this paper is to devise a more objective framework for evaluating consultants' general capabilities during the pre-selection process. The paper begins by identifying the commonly used criteria for pre-selecting engineering consultants. In order to examine the importance of consultant pre-selection criteria (CPC), a questionnaire survey has been conducted with clients who are responsible for pre-selecting their consultants; and consultants being pre-selected by the clients. The findings reveal that the perception of the client and consultant groups on the importance of CPC was very consistent. Finally, a multi-criteria model for evaluating consultants' general capabilities during the pre-selection is proposed. Based on each candidate score, clients can determine which engineering consultants should be invited to bid for a consultancy assignment.
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    URL: http://dx.doi.org/10.1108/09699980410535769
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    Balancing fee and quality in two envelope fee bidding (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 159-175 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Consultant commissions in two envelope fee bidding are awarded on the basis of fee and quality (i.e. technical score). Consultants' fees and technical score are combined using a pre-designated formulation and predetermined weightings to form a total score. Procurers seem to be having difficulties with existing formulations in controlling the extent to which two envelope fee competitions are dominated by fees. This is because, in most cases, fees vary more than technical scores and the predetermined weightings applied are not sufficient to correct the variability imbalance. The analysis in this paper shows that in fee dominant competitions lower fee-lower technical scoring consultants are more likely to be successful in winning commissions. The analysis shows that this can be corrected by balancing fees and technical score. Although procurers are likely to pay higher fees when balancing fees and technical scores they normally benefit from getting higher technical scoring consultants.
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    An open framework for corporate strategy in construction (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 176-188 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: A new conceptual model for corporate strategy in the construction industry is presented that is derived from two principal inputs. First, the fundamental components of the model are based upon observations drawn from an empirical study of 24 international firms competing in global engineering and construction markets. Second, the accumulated intellect of different strategic theories developed over four decades of strategic management research helps to fortify the model with theoretical propositions and establish linkages among the model's basic components. The proposed model is comprised of seven strategic fields, two organizational mechanisms and a boundary notion that divides a firm's internal setting from its external environment. The model's development leads to two central propositions: strategic fields and organizational mechanisms should function as variables to react with external dynamics, and the interaction of these variables consequently promotes higher order differentiation factors that will enhance the strategic outlook of a firm.
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    URL: http://dx.doi.org/10.1108/09699980410535787
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    Total quality management in Australian contracting organisations: pre-conditions for successful implementation (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 189-198 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Total quality management (TQM) is widely recognised as an enabler for performance improvement in the construction industry. This paper presents empirical findings from eight contracting organisations that have adopted TQM practices in response to competitive and environmental pressures. Using the NIES "How To" model developed by the Australian Government's National Industry Extension Scheme, the paper describes pragmatic considerations. Case study findings reveal that when implementing TQM, contractors must align their organisational culture with the objectives of their TQM program.
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    URL: http://dx.doi.org/10.1108/09699980410535796
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    Downtime model development for construction equipment management (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 199-210 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Downtime (DT) caused by non-availability of equipment and equipment breakdown has non-trivial impact on the performance of construction projects. Earlier research has often addressed this fact, but it has rarely explained the causes and consequences of DT - especially in the context of developing countries. This paper presents a DT model to address this issue. Using this model, the generic factors and processes related to DT are identified, and the impact of DT is quantified. By applying the model framework to nine road projects in Nepal, the impact of DT is explored in terms of its duration and cost. The research findings highlight how various factors and processes interact with each other to create DT, and mitigate or exacerbate its impact on project performance. It is suggested that construction companies need to adopt proactive equipment management and maintenance programs to minimize the impact of DT.
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    URL: http://dx.doi.org/10.1108/09699980410535804
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    Critical path determination by incorporating minimum and maximum time and distance constraints into linear scheduling (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 211-222 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: A scheduling method for determining the critical path in linear projects is presented, that takes into account maximum time and distance constraints in addition to the commonly used minimum time and distance constraints. The maximum constraints, though often present in the specifications of a project, are not considered during the planning procedure, since no method existed to enable scheduling with them. The proposed method builds on the concept of the maximum constraints and expands on the necessary background for their implementation into the schedule. The introduced critical path algorithm allows for grouping linear activities into four categories regarding their critical status and their ability to influence project duration. The method is applied to a low-pressure pipeline construction project and the results are presented.
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    URL: http://dx.doi.org/10.1108/09699980410535813
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    Innovation, construction SMEs and action learning (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 230-237 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Action learning is intended to enable a group of professionals (a SET) to tackle work problems, develop solutions and reflect upon the success and failure of their actions. As part of the UK construction industry's drive to improve learning and performance, four SETs of small and medium-sized enterprises (SMEs) were established. This paper evaluates the capacity of action learning to promote innovation and use of technologies within a CIOB-funded SET located in Watford. Construction companies were unable to address real problems related to their day-to-day activities due to competition. Instead, they identified an industry-wide issue - a lack of quality recruits - and marshalled resources to provide better careers advice and promote opportunities for builders. The role of action learning in empowering construction SMEs to contribute to industry change programmes is explored.
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    URL: http://dx.doi.org/10.1108/09699980410547586
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    A survey of ICT use in the Turkish construction industry (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 238-247 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper assesses the awareness and use of information and communication technologies (ICT) systems within the Turkish construction industry. The findings will assist in identifying the future directions and priorities for how to use ICT as an enabler in this country. The research has been carried out via 22 semi-structured interviews with senior construction professionals within government and private organizations. It investigated the usage and applicability of current information systems and technologies. The interviews then explored the appropriateness of some of the newly emerging technologies to the industry in Turkey. The findings are reported under three categories of: ICT infrastructures and strategies, the use of information systems, and views on emerging technologies. The last item has been expanded and discussed in more detail, in the paper.
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    URL: http://dx.doi.org/10.1108/09699980410547595
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    Drivers for dynamic brief development in construction (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 248-258 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Confining the development of the project brief to a certain stage hinders the interaction between the client and the designer. In addition, it inhibits the incorporation of the influential internal and external factors that may affect the project. In spite of the frequently adverse impact of change orders on project cost, time and quality, literature review and case studies showed that client organisations continue to use change orders to achieve their expectations and enhance their projects' performance principally because current construction management process instills an expectation that, change after a specified point is somehow outside the project brief rather than part of the ongoing development of that brief. This paper introduces the concept of dynamic brief development (DBD), a process that facilitates client satisfaction, meets the need to adapt to the brief developing factors for the benefit of the project and fulfils the desire to manage project change orders. In this paper, the need, aims and principles of the concept of DBD are explained and the factors driving brief development are identified. In addition, the rationale behind each factor is given and the case study sampling method is described.
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    URL: http://dx.doi.org/10.1108/09699980410547603
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    Determinants of rework in building construction projects (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 259-274 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Rework represents the unnecessary effort of redoing a process or activity that is incorrectly implemented the first time. Using a structured questionnaire survey, the causes and costs of rework in 161 Australian construction projects were identified. Respondents were invited to indicate direct and indirect rework costs that would be subsequently combined to produce a total rework cost (TRC) figure. Stepwise linear multiple regression analysis was then used to determine a model that included an optimum mixture of significant variables that contributed or lead to a reduction in TRC for the projects sampled. The research revealed that rework per se can negatively influence project safety. Client initiated changes and ineffective use of information technology by the design professionals were identified as being significant variables contributing to rework occurrence. Contrary to an earlier presupposition, design scope freezing was also identified as being a significant factor that can contribute to rework.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09699980410547612
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    Bridging the skills gap: a regionally driven strategy for resolving the construction labour market crisis (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 275-283 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Econometric forecasts indicate that the UK construction industry faces a severe skills deficit in the foreseeable future. This paper details the results of a major labour market research projects, which canvassed the opinions of over 50 industry stakeholders within the East Midlands region of the UK. Focus groups were used to elicit the collective opinions of key clients, consultants, contractors, industry bodies and employers of all sizes. The key themes and requirements discussed by the participants are used to develop a conjoined strategy for bridging the industry's skills gap at a regional level. It is argued that this package of mutually supportive measures could provide a transferable strategy for addressing skills deficiencies in other regions, particularly given the espoused government aspiration to devolve labour market planning activities to provincial forums and regional development agencies.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09699980410547621
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    Impacts of CAD on design realization (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 284-291 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Complete and accurate design is critical for construction project success. Manifesting design intent in the constructed facility depends on coordinated design documents that are developed through design realization. This process evolves design intent from architects and engineers to contractors, through the production and review of shop drawings and other submittals. Information technology has been promoted as a tool to improve this process, but is not being fully utilized for this purpose. A case study investigates the impacts of computed aided design (CAD) on design realization. Comparative analysis between shop drawings prepared by hand and those done with CAD quantify notes, corrections and information transfer errors. Results support the hypothesis that utilizing CAD can improve design accuracy and lower project costs. Barriers to wider adoption, implications for practice and further research are discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09699980410547630
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    Managing knowledge and intellectual capital for improved organizational innovations in the construction industry: an examination of critical success factors (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 301-315 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Innovation is viewed as a major source of competitive advantage and is perceived to be a pre-requisite for organizational success and survival. The ability to innovate depends largely on the way in which an organisation uses and exploits the resources available to it. The paper explores the importance of knowledge management (KM) and intellectual capital (IC) in organisations. It also considers the critical factors that lead to successful innovations and the role of KM and IC in this regard. The paper argues that effective management of knowledge assets involves a holistic approach to a host of factors. It is also suggested that there are a host of factors that combine in different ways to produce successful organizational innovations. It recommends that more is needed on the education and training of construction personnel and that these education and training programmes should reflect the nature of innovation and KM dimensions as very complex social processes.
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    URL: http://dx.doi.org/10.1108/09699980410558494
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    Creating, supporting and sustaining a culture of innovation (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 316-322 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Recently the industry's clients, designers and society as a whole, have begun to accept that innovation can offer key benefits in the form of financial growth and increased profits. Therefore, it is apparent that the development of a culture of innovation is of utmost importance if a business is to become universally proactive, entrepreneurial and remain successful. This owes much to the fact that the agility and ability of an organisation to respond to the changing marketplace is driven by its propensity to innovate. This paper does not attempt to resolve these problems; it merely attempts to raise awareness of the key issues relating to innovation, diffusion and the associated management of change. Moreover, it promotes the benefits afforded by developing an organizational culture of innovation. The content will be of interest to industrialists and researchers and will describe the key issues associated with product derivation, introduction and wider diffusion. Ultimately, it aims to demonstrate that creativity, the promotion of a culture for innovation, and the development of intellectual capital are issues of utmost importance in generating and maintaining a proactive and entrepreneurial organisation.
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    URL: http://dx.doi.org/10.1108/09699980410558502
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    Integrating procurement and operational innovations for construction industry development (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 323-334 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Uncertainty of eventual outcomes coupled with a reluctance to embark upon potentially long learning curves, have militated against much-needed holistic innovations in our instant-results-oriented construction industry. While sporadic initiatives towards new organizational and/or contractual arrangements have enabled incremental improvements in some scenarios, the increasing demand for step gains in construction industry performance levels evidently envisages a more solid launching pad with re-engineered paradigmatic foundations. Initial investigations suggest that the foregoing desired goals may be achieved together. Finally, a conceptual model that coherently synergises these strategies for institutional and industry development is presented and discussed.
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    URL: http://dx.doi.org/10.1108/09699980410558511
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    The innovation potential of integrated services and its utilisation through co-operation (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 335-341 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: In the last few years an increasing demand for integrated services could be recognised on the construction market. For construction firms this means that there is a wider scope for achieving advantages in competition. Based on a research project on the innovation behaviour of two Swiss contractors this paper presents the innovation potential of integrated services and the advantages and disadvantages of the present organizational structure of medium-sized contractors with respect to the usage of this potential. Moreover, possibilities for construction firms to build up and benefit from internal and external co-operation and to generate innovative constructional solutions are discussed. It is concluded that an innovative construction industry requires the ability of construction firms to co-operate.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09699980410558520
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    The role of technology transfer in innovation within small construction firms (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 342-348 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Findings were drawn from an 18 month research project involving in-depth case study and action research fieldwork with seven small construction companies to understand the role and significance of innovation for them. A key finding of the work has been the importance of the role of effective technology transfer in the innovation process. The "organizational factors of innovation" model is presented as an analytical and prescriptive tool to assist small construction firms to understand better and manage the technology transfer process. The utility and application of the model is illustrated with a case study.
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    URL: http://dx.doi.org/10.1108/09699980410558539
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    An innovative approach to identifying knowledge management problems (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 349-357 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The promised benefits from implementing knowledge management (KM) attract an increasing number of organizations. However, many organizations, face several difficulties when designing a KM system or implementing its initiatives. These difficulties, along with some unsuccessful KM initiatives worry many organizations interested in the concept. This paper investigates the reasons for these difficulties and discusses the issues that need to be addressed to develop robust KM systems. It then introduces a systematic approach for addressing these issues at the early stages of designing a KM system. This approach was developed within the cross-sectoral learning in the virtual enterprise (CLEVER) project and supports the definition of KM problems within a business context. The approach has been encapsulated into a prototype software system to make it easier to use. The paper describes in detail the operational level of the prototype. It also discusses the potential of the developed prototype, and concludes that it represents an innovative tool for improved KM.
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    URL: http://dx.doi.org/10.1108/09699980410558548
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    Technology-based learning and the project manager (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 358-365 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Construction is a project-oriented industry that benefits from both the technical and interpersonal skills that a project manager has to offer. Increasingly, project management is viewed as being an integrated process relevant throughout the project lifecycle, which necessarily draws upon a broad range of knowledge and abilities. It is imperative that project managers, therefore, have ready access to education and training programmes that enable them to update their skills. This paper compares a new distance learning project management educational software application with a traditional multiple-media resource and a well-established postgraduate module delivered in part-time mode to establish the pedagogic effectiveness of distributed interactive multimedia. An analysis of quantitative data generated over a two-year period finds that whilst learning and confidence gains occur in all delivery modes, there is no significant difference in the academic performance of students between the traditional control and distance learning experimental groups.
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    URL: http://dx.doi.org/10.1108/09699980410558557
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    Reconciling construction innovation and standardisation on major projects (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 366-372 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: The concepts underlying innovation and standardisation presents an apparent divergence in what each strives to achieve. In the view of the authors, this has contributed in no small measure to the low take-up of standardisation within the construction sector as organisations strive to be innovative to improve on their performance and attain continuous improvement in their processes and operations as well as design solutions. The paper presents as a case, how one major public sector outfit is striving to achieve innovation within an agenda that involves a widespread adoption of standardisation. It presents the motivations for adopting an organisation-wide agenda on innovation and standardisation, identifies the elements of apparent incongruity between the concepts, and outlines how the case organisation has resolved the divergences.
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    URL: http://dx.doi.org/10.1108/09699980410558566
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    Innovative 3D-modelling for selecting and locating mobile cranes (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 373-380 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: This paper provides an overview of a recently developed system for selecting and locating mobile cranes on construction sites. The proposed system provides direct help on two fronts: cost and time savings, and improved safety arrangements. The system has a number of interesting features: a relational database designed to store the cranes' geometry-related variables and to present them using powerful graphics; a selection module supported by an algorithm designed to satisfy geometrical requirements and necessary clearances, accounting for site constraints and lift configurations; and 3D animation to facilitate the planning of crane operations. The system provides a near-optimum selection of crane lift configurations, considering available cranes. This paper focuses mainly on case examples to demonstrate and to illustrate the use and capabilities of the developed system. Two actual cases, featuring different site constraints and lift configurations, are presented. In these cases, cranes were selected and their operations planned using the developed system. The findings of the two cases are discussed and the benefits of the proposed methodology are highlighted.
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    URL: http://dx.doi.org/10.1108/09699980410558575
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    The construction sector, congestion charging and exemptions (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 386-394 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: In February 2003, London became the first city in the UK to introduce a comprehensive congestion-charging scheme, whereby road users are charged on a per day basis in order to use the road space. In response to concerted lobbying, a number of sectors and user groups have been granted exemptions from the charge. This paper explores the likely effect of congestion charging and the case for exempting construction delivery vehicles. A case study of a live construction project currently being undertaken in the city of London is used to illustrate the impact of the scheme. Based on this case example, it would seem that the impact of the scheme on construction companies has been fairly benign to date, but concerns relate to the longer term effect of charging on the future regeneration of city centres. Furthermore, it would appear that there are lessons to be learnt from the industry's apparent inability to bring to bear its collective weight to lobby for exemptions, which leaves it vulnerable to similar schemes under consideration in other cities both nationally and internationally.
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    URL: http://dx.doi.org/10.1108/09699980410570157
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    Valuing guarantees in a BOT infrastructure project (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 395-403 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Host governments often provide guarantees in build-operate-transfer (BOT) infrastructure projects to attract private sector investors. Problems arise because the governments often do not know the full extent of contingent liabilities when issuing guarantees, and because they account and record guarantee costs only when guarantees come due. This paper discusses the guarantees' financial impact from the perspectives of the government and the project sponsor. A typical Indonesian BOT toll road project is taken as the case study. Stochastic simulation using Latin Hypercube technique is applied on the cash flow model with and without guarantees. Several types of guarantees including minimum revenue guarantee, maximum interest rate guarantee, debt guarantee, tariff guarantee and minimum traffic guarantee are discussed. Simulation results reveal that guarantees can reduce risk but are not free of cost. If compared with equivalent subsidies, however, some guarantees can be more effective in lessening the extent of project risk.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09699980410571543
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    A study on project success factors in large construction projects in Vietnam (2004)
    Oxford : Emerald
    Engineering, construction and architectural management 11 (2004), S. 404-413 
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    ISSN: 1365-232X
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Architecture, Civil Engineering, Surveying
    Notes: Large construction projects are inherently complex and dynamic. A comprehensive answer on how to manage such projects successfully is difficult to provide. This paper expounds on the success factors for large construction projects in Vietnam. A survey questionnaire was used to collect data from practitioners. Factor analysis was employed to categorize these success factors perceived by 109 respondents from 42 construction-related organizations. Factor analysis uncovered that these success factors can be grouped under four categories, here titled the four COMs: comfort, competence, commitment, and communication. The result can be used as a guideline to successfully handle construction projects in Vietnam as well as in other countries, especially in the emerging economies in Asia and the rest of the world.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/09699980410570166
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    The Internet and services marketing - the case of Danish retail banking (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 7-18 
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    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Examines various aspects of the motives, perceptions and expectations connected with the introduction of Internet banking in Danish retail banking. Responses from 60 key managers in the largest retail banks in Denmark show that they believe that Internet banking will become more important in the future, whereas all other distribution channels are predicted to become less important. Describes further the relationship between the perceptions of and expectations from Internet banking, the reasons for offering an Internet bank and the way it has been organized in the banks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10662240010312093
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    Changes in the banking sector - the case of Internet banking in the UK (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 19-31 
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    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: The Internet is gaining popularity as a delivery channel in the banking sector. At the same time, customer needs are changing. A total of 12 Internet banking operations in the UK are analysed under customer empowerment functions and Internet banking Web attributes. Internet banking renders location and time irrelevant, and empowers customers with greater control of their accounts. Banks achieve cost and efficiency gains in a large number of operational areas.
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    URL: http://dx.doi.org/10.1108/10662240010312048
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    Quantitive evaluation of Web site content and structure (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 31-44 
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    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Describes an approach automatically to classify and evaluate publicly accessible World Wide Web sites. The suggested methodology is equally valuable for analyzing content and hypertext structures of commercial, educational and non-profit organizations. Outlines a research methodology for model building and validation and defines the most relevant attributes of such a process. A set of operational criteria for classifying Web sites is developed. The introduced software tool supports the automated gathering of these parameters, and thereby assures the necessary "critical mass" of empirical data. Based on the preprocessed information, a multi-methodological approach is chosen that comprises statistical clustering, textual analysis, supervised and non-supervised neural networks and manual classification for validation purposes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10662240010312138
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    Perceptions of Web site design characteristics: a Malaysian/Australian comparison (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 44-55 
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    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Compares the perceptions of Malaysians (representing eastern, Asian culture) and Australians (representing western, European culture) for four Web site design characteristics - atmospherics, news stories, signs and products and services - as part of the integrated Internet marketing model. Under controlled laboratory conditions, two groupings of 30 subjects evaluated eight Web sites - four in Malaysia and four in Australia - in the retail and services sectors. Hypothesises that the predominant culture is not generalised to another culture. Some tentative support for the research premise is found since where a group's perceptions for Web design characteristics and their effectiveness was significantly higher, it was for sites originating in that group's country. Furthermore, perceptions both support and contradict previous research suggesting that Australians prefer an environment of low context and high explicit communications while Asians operate in an environment of high context that stresses implicit communications.
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    URL: http://dx.doi.org/10.1108/10662240010312084
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    The influence of power on trading partner trust in electronic commerce (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 56-63 
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    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Power has become an important contextual factor in electronic commerce adoption. Persuading trading partners can mean using persuasive power. Hence, the way power is used to influence trading partners will determine the extent to which trust is encouraged during the adoption and integration process. The purpose of this paper is to focus on the impact of power in EDI adoption. The findings of a case study within an automotive manufacturer indicate that negative (coercive) power left smaller suppliers in a situation of uncertainty, and even conflict, whereas positive (persuasive) power resulted in open communications between smaller suppliers and their buyers, thus building trading partner trust and long-term trading relationships.
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    URL: http://dx.doi.org/10.1108/EUM0000000005316
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    The influence of information technology access on agricultural research in Nigeria (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 63-71 
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    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Examines the relationship between accessibility to information technology and research publications among users of agricultural libraries in Nigeria. A self-constructed questionnaire, which had a reliability coefficient of 0.90, was used to collect data. A total of 150 questionnaires were distributed and a response rate of 78.7 per cent was obtained. Data were analyzed using the Pearson product moment correlation coefficient and the student t-test. Results showed that there was no significant association between accessibility and research publications. The finding is discussed in the context of information technology benefits in developing countries generally. Suggestions are proffered on how to improve the benefits of IT access.
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    URL: http://dx.doi.org/10.1108/10662240010312110
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    Factors influencing the types of products and services purchased over the Internet (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 102-113 
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    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Presents the findings of an empirical investigation of Internet shopping in Singapore. Specifically, Internet buying behaviour is compared between potential Internet buyers and non-Internet buyers. It was found that the classification of different types of products and services will significantly influence the consumer choice between a retail store and Internet shopping mall. The types of products and services that are suitable for selling through the Internet are also identified. Generally, products and services that have a low outlay, are frequently purchased, have intangible value proposition, and relatively high on differentiation are more likely to be purchased via the Internet. Based on the analysis and results obtained from the study, some recommendations are presented to retailers who are interested in selling their products via the Internet.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10662240010322894
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    From EDI to Internet commerce: the BHP Steel experience (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 72-83 
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    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Discusses the issue of business-to-business e-commerce implementation and the factors affecting it, considering the appropriateness of the various theories which underpin research into systems implementation (primarily diffusion of innovation and traditional change management theory). Describes the results of a case study of BHP Steel, the largest steel producer and one of the largest companies in Australia, which is a leader in e-commerce implementation. The results suggest that, over time, the driving force for e-commerce changed significantly. From an initial push to improve current business processes by adopting EDI to achieve savings and improve efficiency, the company came to be driven by a desire for greater supplier involvement and customer service in later implementations. Discusses the ways in which BHP Steel's e-commerce innovations have changed and suggests that, in addition to considering the characteristics of the innovation process, other more contextual aspects of implementation (such as the social system in which the innovation evolves and the timing of the innovation's introduction) be considered in an inter-organizational context.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10662240010312039
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    The role of human Web assistants in e-commerce: an analysis and a usability study (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 114-125 
    Details
    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Electronic commerce has recently shown enormous potential to take over a significant share of the sales market. There is a need to provide services that can reach individual computer users with different information profiles and levels of expertise. In this article the concept of Web assistants, human assistants working in an electronic Web shop, is presented. This human-computer collaboration provides intelligent and adaptive services via an integrated communication media. A prototype of a Web assistant system has been implemented. While browsing through the system the user can call for human assistance should the need arise. Presents the results of a usability study performed on the prototype system. Recent commercial moves in the direction discussed in this article increase the importance of the usability study. The results are encouraging, especially when it comes to the attitude aspects of usability. The subjects were extremely enthusiastic about the concept of Web assistants and its implications. The human Web assistant who participated in the field trial highlighted the importance of user modelling. Although the system is mainly in the context of electronic commerce, it can be used in many other contexts. These include home automation, digital libraries, and technical support, to name a few.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10662240010322902
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  • 98
    Electronic Resource
    Electronic Resource
    An empirical study of Internet usage and difficulties among medical practice management in the UK (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 170-181 
    Details
    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: Considers the use of information technology in the UK National Health Service (NHS) as the government pledges to connect every doctor or general practitioner (GP) to the NHS's information superhighway by the year 2002. This paper uses a case study of a particular UK health authority as a vehicle to illustrate the complexity of the social and technical considerations surrounding this issue. At a grass roots level, the adoption and diffusion of information technology within general practices (surgeries or groups of GPs) is highly varied and there are huge contrasts in the levels of commitment to information management. Within the case study this is evident on an individual level, in that some GPs enthuse about technology, while others are positively "technophobic". On the general practice level, there are other elements to consider, especially in relation to the levels of financial support available. Non-fund holding general practices in socially deprived areas are far less willing to embrace information management and technology. One explanation suggested for this is based on priorities: when faced with the option of "cruising" the information superhighway, as opposed to treating seriously ill patients living in socially deprived areas, the former may simply be relegated as less important.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10662240010322957
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  • 99
    Electronic Resource
    Electronic Resource
    Segment-based mass customization: an exploration of a new conceptual marketing framework (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 215-226 
    Details
    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: In this paper, it is argued that the concept of mass customization should not be treated as an alternative strategy to market segmentation. It should be seen as an integral part of market segmentation theory which offers the best way to satisfy individual consumer's unique needs and wants while yielding profits to companies. Though the overall objective of the concept of mass customization is to recognize individual differences among customers and modify the offerings accordingly, by using the logic of the segmentation theory, this paper argues that mass customization is also not simply equal to segmenting-to-one. If all the relevant variables that affect buyer behavior are taken into account, the result is an untenably large number of market segments (finally segment of one). However, practically, creating separate marketing programs for each individual in most circumstances will become extremely difficult, even not feasible, and less profitable. In response to this dilemma, this paper proposes a new concept of "Segment-based mass customization". The basic idea behind this concept is that, mass customization is the efforts of reaching a segment unit efficiently and profitably. The efficiency and profitability will be determined by whether the mass customization is based on an optimal segment size, which is subject to the market situation and company resources. Finally, this paper comes up with a series of propositions which are relevant to developing a good customization strategy.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10662240010331975
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  • 100
    Electronic Resource
    Electronic Resource
    Internet-based security incidents and the potential for false alarms (2000)
    Bingley : Emerald
    Internet research 10 (2000), S. 238-245 
    Details
    ISSN: 1066-2243
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Computer Science
    Notes: The paper explains the background to experimental work that was conducted with the aim of measuring aspects of the WWW (specifically the average lifetime of a web link and the impact of the "Millennium Bug"), but which inadvertently caused two perceived security breaches on remote systems. The paper explains the nature of these incidents and considers why, when over 700,000 IP addresses were randomly sampled in the experimental study, only two sites considered the activity to be an attempt to breach their security. It is concluded that, while the appropriate protection of Internet-based systems is undoubtedly of importance, the problems experienced during the experimental study suggest a lack of uniformity in what different organisations will class as a security breach.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/10662240010331984
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