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  • English  (244)
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  • 101
    Publication Date: 2020-02-12
    Description: We present evidence for significant deviations of the true instrument gain from that reported for several modern broad-band permanent seismograph stations. Our result derives from a systematic comparison of observed and synthetic long-period seismograms for approximately 600 large earthquakes. Seismograms were collected from globally distributed stations and analyzed using the centroid-moment-tensor (CMT) algorithm for estimating earthquake parameters. Following the source inversion, synthetic seismograms corresponding to the final earthquake parameters were compared with the observed seismograms and an optimal amplitude-scaling coefficient for each seismogram was determined. Scaling coefficients for earthquakes occurring in a given calendar year were then averaged to investigate the temporal stability of instrument gain. Data for up to 15 years (1990–2004) for more than 200 stations were processed. Most stations show good agreement (±10%) between the observed and reported gains. A small number of stations display a larger constant offset in the gain, probably caused by errors in the reported absolute gain or, potentially, by unmodeled systematic effects resulting from the Earth's lateral heterogeneity. The existence of errors in the reported long-period gain is confirmed through a station-by-station comparison with results from an independent analysis of station-gain bias at similar periods. More than 15 stations display significant reductions in the true long-period gain that occur gradually over several months to a few years. At ∼250-s period, these changes are as large as 50% of the reported gain. The changes are smaller at shorter periods, suggesting a frequency-dependent modification of the instrument response. All of the affected stations showing a time-dependent deterioration are equipped with the Streckeisen STS-1 seismometer, suggesting a common cause for the observed behavior.
    Language: English
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  • 102
    Publication Date: 2020-02-12
    Description: [1] We present a new three-dimensional Sv wave speed and azimuthal anisotropy model for the upper mantle of eastern Asia constrained by the analysis of more than 17,000 vertical component multimode Rayleigh wave seismograms. This data set allows us to build an upper mantle model for Asia with a horizontal resolution of a few hundred kilometers extending to ∼400 km depth. At 75–100 km depth, there is approximately ±9% wave speed perturbation from the “smoothed PREM” reference model used in our analysis, and the pattern of azimuthal anisotropy is complex. Both the amplitude of the Sv wave speed heterogeneity and the complexity and amplitude of the azimuthal anisotropy decrease with depth. Above ∼200 km depth the upper mantle structure of the model correlates with surface geology and tectonics; below ∼200 km depth the structures primarily reflect the advection of material in the upper mantle. Since shear wave speed is principally controlled by temperature rather than by composition, Vs(z) can be used to calculate the temperature T(z), and hence map the lithospheric thickness. We use the relationship of Priestley and McKenzie to produce a contour map of the lithospheric thickness of eastern Asia from the surface wave tomography. This shows an extensive region of thick lithosphere beneath the Siberian Platform and the West Siberian Basin that extends to the European Platform, forming the stable Eurasian craton or core. The eastern portion of the Eurasian craton has controlled the geometry of continental deformation and the distribution of kimberlites in eastern Asia.
    Language: English
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  • 103
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    In:  Scientific Drilling
    Publication Date: 2020-02-12
    Language: English
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  • 104
    Publication Date: 2020-02-12
    Language: English
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  • 105
    Publication Date: 2020-02-12
    Description: Detailed images of the lithosphere beneath the western Bohemian Massif were obtained by analysis of more than 8500 P receiver functions. At the intersection of Regensburg-Leipzig-Rostock zone and Eger Rift, crustal thickness decreases to 26 km from approx. 31 km in the surroundings. The receiver functions display a positive phase at about 6 s delay time and a strong negative phase at 7 to 8 s, which coincides with an area of Moho updoming, CO2 mantle-derived degassing and earthquake swarm activity. These phases can be modeled by a velocity increase at 50 km and a velocity decrease at 65 km depth. The velocity decrease, observed over an area of 5300 km2, gives evidence for local asthenospheric updoming and/or a confined body of partial melt, which might be the cause for high CO2 mantle fluid flow and earthquake swarm activity in this recently nonvolcanic, intracontinental rift area.
    Keywords: 550 - Earth sciences
    Language: English
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  • 106
    Publication Date: 2020-02-12
    Description: Compound-specific isotope analysis has become an important tool in environmental studies and is an especially powerful way to evaluate biodegradation of hydrocarbons. Here, carbon isotope ratios of light hydrocarbons were used to characterise in-reservoir biodegradation in the Gullfaks oil field, offshore Norway. Increasing biodegradation, as characterised, for example, by increasing concentration ratios of Pr/n-C17 and Ph/n-C18, and decreasing concentrations of individual light hydrocarbons were correlated to 13C-enrichment of the light hydrocarbons. The δ13C values of C4 to C9n-alkanes increase by 7–3‰ within the six oil samples from the Brent Group of the Gullfaks oil field, slight changes (1–3‰) being observed for several branched alkanes and benzene, whereas no change (〈1‰) in δ13C occurs for cyclohexane, methylcyclohexane, and toluene. Application of the Rayleigh equation demonstrated high to fair correlation of concentration and isotope data of i- and n-pentane, n-hexane, and n-heptane, documenting that biodegradation in reservoirs can be described by the Rayleigh model. Using the appropriate isotope fractionation factor of n-hexane, derived from laboratory experiments, quantification of the loss of this petroleum constituent due to biodegradation is possible. Toluene, which is known to be highly susceptible to biodegradation, is not degraded within the Gullfaks oil field, implying that the local microbial community exhibits rather pronounced substrate specificities. The evaluation of combined molecular and isotopic data expands our understanding of the anaerobic degradation processes within this oil field and provides insight into the degradative capabilities of the microorganisms. Additionally, isotope analysis of unbiodegraded to slightly biodegraded crude oils from several oil fields surrounding Gullfaks illustrates the heterogeneity in isotopic composition of the light hydrocarbons due to source effects. This indicates that both source and also maturity effects have to be well constrained when using compound-specific isotope analysis for the assessment of biodegradation.
    Keywords: 550 - Earth sciences
    Language: English
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  • 107
    Publication Date: 2020-02-12
    Description: As part of the South American Geodynamic Activities project we observed the present day deformation field in the territories of Chile and Argentina using the Global Positioning System. The results clearly show that the earthquake cycle dominates the contemporary surface deformation of the central and southern Andes. Compared to geological timescales, the transient elastic deformation related to subduction earthquakes presents a short-term signal which can be explained by interseismic, coseismic, and postseismic phases of interplate thrust earthquakes. We constructed the Andean Elastic Dislocation Model (AEDM) in order to subtract the interseismic loading from the observed velocities. The estimated parameters of the AEDM, and the amount and depth of coupling between the subducting Nazca and overriding South American Plates, represent long-term features and show that the seismogenic interface between both plates is fully locked and that the depth of coupling increases from north to south. The prominent signals in the residual velocity field (i.e. observed velocities minus AEDM) are obviously due to postseismic relaxation processes; they are visible in the area of the 1995 Mw 8.0 Antofagasta earthquake and in the area of the 1960 Mw 9.5 Valdivia earthquake. Although postseismic deformations, compared to geologic timescales, are short-term signals, those signals are valuable constraints on important long-term features of Andean evolution, i.e., the viscosity of the upper mantle and lower crust. The observed surface data are best fitted with a three-dimensional finite element model in which we incorporate a mantle viscosity of 4 × 1019 Pa s. The most obvious long-term deformation signal is manifested in the back-arc of the subduction zone where the Brazilian Shield thrusts beneath the Subandean zone. The style and amount of backarc shortening changes along strike of the orogen, increasing from zero in the south (latitude 〈 −38° S) to values in the order of 10 mm yr−1 close to the Bolivian Orocline. In the fore-arc, whilst we see indications for long-term E-W extension, we did not find any apparent slip partitioning. In addition to this long-term signal, we suggest that the asymmetry of interseismic and coseismic deformation may lead to tectonic structures in the fore-arc. If the coseismic deformation does not release all of the accumulated deformation, then, over many earthquake cycles, part of the interseismic deformation may be transformed into permanent long-term plastic deformation.
    Keywords: 550 - Earth sciences
    Language: English
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  • 108
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    In:  The Andes - Active Subduction Orogeny | Frontiers in Earth Sciences
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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  • 109
    Publication Date: 2020-02-12
    Language: English
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  • 110
    Publication Date: 2020-02-12
    Language: English
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  • 111
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    International Association of Geomagnetism and Aeronomy (IAGA)
    In:  IAGA Annual Report
    Publication Date: 2020-02-12
    Language: English
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  • 112
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    In:  Scientific Drilling
    Publication Date: 2020-02-12
    Language: English
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  • 113
    Publication Date: 2020-02-12
    Description: [1] We compare observations of long-period seismic surface waves and free oscillations recorded by high-resolution long-base fluid tube tiltmeters and by nearby broadband seismometers after large earthquakes. The quality of the tiltmeter data is comparable to that of the best horizontal component seismic data, recording some of the gravest free oscillations of the Earth, as well as successive passages of seismic surface waves circling the globe. We compare the observations with theoretical seismograms and with theoretical tilt. The predicted and observed surface wave tilt waveforms are very similar provided that we take into account horizontal acceleration effects on the tiltmeter. Phase and amplitude anomalies between the waveforms are well explained by the theoretical transfer function of the instrument. Likewise, observed horizontal seismograms converted into tilt match the tiltmeter data very well. Long-base fluid tube tiltmeters could potentially contribute to obtain high-quality measurements of the long-period seismic spectrum.
    Language: English
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  • 114
    Publication Date: 2020-02-12
    Language: English
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  • 115
    Publication Date: 2020-02-12
    Language: English
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  • 116
    Publication Date: 2020-02-12
    Language: English
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  • 117
    Publication Date: 2020-02-12
    Language: English
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  • 118
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    In:  Scientific Drilling
    Publication Date: 2020-02-12
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  • 119
    Publication Date: 2020-02-12
    Description: We employ P to S converted waveforms to investigate effects of the hot mantle plume on seismic discontinuities of the crust and upper mantle. We observe the Moho at depths between 13 and 17 km, regionally covered by a strong shallow intracrustal converted phase. Coherent phases on the transverse component indicate either dipping interfaces, 3-D heterogeneities or lower crustal anisotropy. We find anomalies related to discontinuities in the upper mantle down to the transition zone evidently related to the hot mantle plume. Lithospheric thinning is confirmed in greater detail than previously reported by Li et al., and we determine the dimensions of the low-velocity zone within the asthenosphere with greater accuracy. Our study mainly focuses on the temperature-pressure dependent discontinuities of the upper mantle transition zone. Effects of the hot diapir on the depths of mineral phase transitions are verified at both major interfaces at 410 and 660 km. We determine a plume radius of about 200 km at the 660 km discontinuity with a core zone of about 120 km radius. The plume conduit is located southwest of Big Island. A conduit tilted in the northeast direction is required in the upper mantle to explain the observations. The determined positions of deflections of the discontinuities support the hypothesis of decoupled upper and lower mantle convection.
    Keywords: 550 - Earth sciences
    Language: English
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  • 120
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    In:  Scientific Drilling
    Publication Date: 2020-02-12
    Language: English
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  • 121
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: English
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  • 122
    Publication Date: 2020-02-12
    Description: In the south-eastern corner of the Tyrrhenian basin, in the central Mediterranean Sea, a tight alignment of earthquakes along a well-defined Benioff zone marks one of the narrowest active trenches worldwide, where one of the last fragment of the former Tethys ocean is consumed. Seismic tomography furnishes snapshot images of the present-day position of this slab, and seismic anisotropy allows to reconstruct the past kinematics of the subduction process. Using seismic anisotropy fast directions as a proxy for the present and past mantle flow, we look backward for the seismic traces of the slab motion through the western-central Mediterranean mantle, from the starting locus of subduction toward its present day position. The result of combining independent data sets provides a coherent pattern of anisotropy that illustrates an example of slab rollback from its initiation point to its present-day position.
    Language: English
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  • 123
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    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Publication Date: 2020-02-12
    Description: Based on the physical processes governing the motion and dynamics of poly-thermal ice sheets, we distinguish two regions; the cold region, where the ice temperature is below the melting point, and the temperate region, where the ice temperature is exactly equal to the melting point, leading to the presence of a water fraction. This work focuses on the analysis and description of the temperate zone on the basis of rational thermo-dynamics of reacting mixtures. The balance laws for the ice-water mixture, that is the mass balance, balance of linear and angular momenta, energy and entropy, are discussed. A physical model for a polythermal ice sheet is then established, including appropriate boundary and transition conditions. The resulting formulation is convenient for numerical implementation. Numerical examples are carried out for a stationary 2-D case and the results of the present and traditional formulations are compared.
    Language: English
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  • 124
    Publication Date: 2020-02-12
    Description: Combined P and S receiver functions from seismograms of teleseismic events recorded at 65 temporary and permanent stations in the Aegean region are used to map the geometry of the subducted African and the overriding Aegean plates. We image the Moho of the subducting African plate at depths ranging from 40 km beneath southern Crete and the western Peloponnesus to 160 km beneath the volcanic arc and 220 km beneath northern Greece. However, the dip of the Moho of the subducting African plate is shallower beneath the Peloponnesus than beneath Crete and Rhodes and flattens out beneath the northern Aegean. Observed P-to-S conversions at stations located in the forearc indicate a reversed velocity contrast at the Moho boundary of the Aegean plate, whereas this boundary is observed as a normal velocity contrast by the S-to-P conversions. Our modeling suggests that the presence of a large amount of serpentinite (more than 30%) in the forearc mantle wedge, which generally occurs in the subduction zones, may be the reason for the reverse sign of the P-to-S conversion coefficient. Moho depths for the Aegean plate show that the southern part of the Aegean (crustal thickness of 20–22 km) has been strongly influenced by extension, while the northern Aegean Sea, which at present undergoes the highest crustal deformation, shows a relatively thicker crust (25–28 km). This may imply a recent initiation of the present kinematics in the Aegean. Western Greece (crustal thickness of 32–40 km) is unaffected by the recent extension but underwent crustal thickening during the Hellenides Mountains building event. The depths of the Aegean Moho beneath the margin of the Peloponnesus and Crete (25–28 and 25–33 km, respectively) show that these areas are also likely to be affected by the Aegean extension, even though the Cyclades (crustal thickness of 26–30 km) were not significantly involved in this episode. The Aegean lithosphere-asthenosphere boundary (LAB) mapped with S receiver functions is about 150 km deep beneath mainland Greece, whereas the LAB of the subducted African plate dips from 100 km beneath Crete and the southern Aegean Sea to about 225 km under the volcanic arc. This implies a thickness of 60–65 km for the subducted African lithosphere, suggesting that the Aegean lithosphere was not significantly affected by the extensional process associated with the exhumation of metamorphic core complexes in the Cyclades.
    Keywords: 550 - Earth sciences
    Language: English
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  • 125
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    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Publication Date: 2020-02-12
    Description: This work describes the results of seismological field campaigns and experiments using combined seismic networks of varying geometries such as a combined seismic downhole and surface network or a combined temporary local and permanent regional network. The networks were deployed in different tectonic environments, i.e. in a stable intraplate surrounding, at a plate boundary along a major transform fault zone and in forearc and backarc settings of a subduction zone to record different types of seismicity (induced earthquakes, aftershocks, subduction-related seismicity). Recording periods are typically several months. The basic ideas behind all the different experiments and studies presented here can be described as follows: In a first step, a state of the art seismic network is designed and deployed in a selected area to record local (micro)seismic activity at low magnitude detection threshold. The acquired data base is then evaluated using standard processing techniques to generate a proper hypocenter catalog for the area of investigation during the observational period. This period might be extended (at higher magnitude detection threshold) through re-evaluating and calibrating earlier hypocenter catalogs gained from records of regional permanent networks. This new catalog for the selected region then forms the base for further evaluation using different approaches one of which is the determination of fault plane solutions in order to determine the local stress field orientation and relate it to the WSM data or information on regional displacement fields determined from GPS recordings.
    Language: English
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  • 126
    Publication Date: 2020-02-12
    Description: We present a new upper mantle seismic model for southern Africa based on the fitting of a large (3622 waveforms) multi-mode surface wave data set with propagation paths significantly shorter (≤ 6000 km) than those in globally-derived surface wave models. The seismic lithosphere beneath the cratonic region of southern Africa in this model is about 175 ± 25 km thick, consistent with other recent surface wave models, but significantly thinner than indicated by teleseismic body-wave tomography. We determine the in situ geotherm from kimberlite nodules from beneath the same region and find the thermal lithosphere model that best fits the nodule data has a mechanical boundary layer thickness of 186 km and a thermal lithosphere thickness of 204 km, in very good agreement with the seismic measurement. The shear wave velocity determined from analyzes of the kimberlite nodule compositions agree with the seismic shear wave velocity to a depth of ∼150 km. However, the shear wave velocity decrease at the base of the lid seen in the seismic model does not correspond to a change in mineralogy. Recent experimental studies of the shear wave velocity in olivine as a function of temperature and period of oscillation demonstrate that this wave speed decrease can result from grain boundary relaxation at high temperatures at the period of seismic waves. This decrease in velocity occurs where the mantle temperature is close to the melting temperature (within ∼100 °C).
    Language: English
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  • 127
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    In:  Bulletin of the Seismological Society of America
    Publication Date: 2020-02-12
    Description: We develop an algorithm for the detection and location of seismic sources using intermediate-period (35–150 sec) surface waves recorded on a global array of stations. Continuous vertical seismic waveforms from the global network are collected and a 4° × 4° global grid of target locations is defined. For each target location and each station, a surface-wave propagation operator is deconvolved from the seismogram to restore any source pulse present. The envelope of the seismogram is calculated and cross correlated with a theoretical source-pulse shape. The resulting waveforms are stacked to improve signal-to-noise characteristics, and the quality, strength, and timing of the potential detection are determined. When a successful event detection is made, a finer grid is applied to locate the event with greater precision. We apply the algorithm systematically for the period 1993–2003 and catalog the events. Approximately 2000 events are detected and located for each year and 98% of shallow events in the Harvard Centroid Moment Tensor (cmt) catalog are detected and located by the new algorithm. A comparison of 9482 events common to the two catalogs allows the detection strength to be calibrated against the cmt moment magnitude. All detected events have estimated moment magnitudes Mw 〉4.5. In each year, approximately 100 events not listed in other global seismicity catalogs are detected and located. Many of these events lie along the ridge-transform plate boundaries in the Southern Hemisphere and may be regular earthquakes that have gone undetected because of poor station coverage. Other events, located in areas where global and regional networks provide good coverage, are potentially anomalous and may have escaped detection as a result of their unusual source properties.
    Language: English
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  • 128
    Publication Date: 2020-02-12
    Language: English
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  • 129
    Publication Date: 2020-02-12
    Language: English
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  • 130
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    In:  Annals of Geophysics
    Publication Date: 2020-02-12
    Description: The ocean exerts a pervasive influence on Earths environment. It is therefore important that we learn how this system operates (NRC, 1998b; 1999). For example, the ocean is an important regulator of climate change (e.g., IPCC, 1995). Understanding the link between natural and anthropogenic climate change and ocean circulation is essential for predicting the magnitude and impact of future changes in Earths climate. Understanding the ocean, and the complex physical, biological, chemical, and geological systems operating within it, should be an important goal for the opening decades of the 21st century. Another fundamental reason for increasing our understanding of ocean systems is that the global economy is highly dependent on the ocean (e.g., for tourism, fisheries, hydrocarbons, and mineral resources) (Summerhayes, 1996). The establishment of a global network of seafloor observatories will help to provide the means to accomplish this goal. These observatories will have power and communication capabilities and will provide support for spatially distributed sensing systems and mobile platforms. Sensors and instruments will potentially collect data from above the air-sea interface to below the seafloor. Seafloor observatories will also be a powerful complement to satellite measurement systems by providing the ability to collect vertically distributed measurements within the water column for use with the spatial measurements acquired by satellites while also providing the capability to calibrate remotely sensed satellite measurements (NRC, 2000). Ocean observatory science has already had major successes. For example the TAO array has enabled the detection, understanding and prediction of El Niño events (e.g., Fujimoto et al., 2003). This paper is a world-wide review of the new emerging Seafloor Observatory Science, and describes both the scientific motivations for seafloor observatories and the technical solutions applied to their architecture. A description of world-wide past and ongoing experiments, as well as concepts presently under study, is also given, with particular attention to European projects and to the Italian contribution. Finally, there is a discussion on Seafloor Observatory Science perspectives.
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  • 131
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    In:  7. Forum und Gefahrentag des DKKV in Eschborn (GTZ) - Vorträge
    Publication Date: 2020-02-12
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  • 132
    Publication Date: 2020-02-12
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  • 133
    Publication Date: 2020-02-12
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  • 134
    Publication Date: 2020-02-12
    Description: The INGV-Harvard European-Mediterranean Regional Centroid Moment Tensor (RCMT) Catalog collects solutions routinely computed since 1997 for earthquakes with moderate magnitude (4.5≤M≤5.5) in the Mediterranean region. The database represents an extension to smaller magnitudes of the Harvard global CMT catalog, based on analysis of seismograms recorded at regional distance, and modeling of intermediate period surface waves. The catalog includes about 600 events, 200 of which in the Italian region. This study extends the catalog back in time, for the Italian region, as long as made possible by available digital data – i.e. since 1977 – with the same analysis and inversion method used for current seismicity. As a result, we present here 65 new moment tensors, for years between 1977 and 1997. These solutions represent 45% of the total number of events analyzed, the existing seismograms being often too scarce to allow a stable solution. The new dataset includes events in many seismic zones where moderate seismicity had previously been scarcely documented, e.g., the Po Plain, the Central to Southern Apennines and the Adriatic Sea. The complete dataset, including previously determined RCMTs and CMTs, represents the seismic deformation in the Italian area during the last 25 years.
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  • 135
    Publication Date: 2020-02-12
    Description: The volcanic arc of the Hellenic subduction zone with its four volcanic centers is of major relevance when evaluating the seismovolcanic hazard for the Aegean region. We present results from a 22-station temporary seismic network (CYCNET) in the central Hellenic Volcanic Arc (HVA). CYCNET recordings allow to analyze the level and spatio-temporal evolution of microseismic activity in this region for the first time. A total of 2175 events recorded between September 2002 and July 2004 are analyzed using statistical methods, cluster analysis and relative relocation techniques. We identify distinct regions with significantly varying spatio-temporal behavior of microseismicity. A large portion of the seismic activity within the upper crust is associated with the presence of islands representing horst structures that were generated during the major Oligocene extensional phase. In contrast, the central part of the Cyclades metamorphic core complex remains aseismic considering our magnitude threshold of 1.8 except one spot where events occur swarm-like and with highly similar waveforms. The highest activity in the study area was identified along the SW–NE striking Santorini–Amorgos zone. Within this zone the submarine Columbo volcano exhibits strong temporal variations of seismic activity on a high background level. This activity is interpreted to be directly linked to the magma reservoir and therein the migration of magma and fluids towards the surface. NE of Columbo where no volcanic activity has yet been reported we observe a similar seismicity pattern with small-scaled activity spots that might represent local pathways of upward migrating fluids or even developing volcanic activity within this zone of crustal weakness. In contrast, the Santorini and Milos volcanic complexes do not show significant temporal variations and low to moderate background activity, respectively. Relating our results to the distribution of historical earthquakes and the GPS-derived horizontal velocity field we conclude that the Santorini–Amorgos zone is presently in the state of right-lateral transtension reflecting a major structural boundary of the volcanic arc subdividing it into a seismically and volcanically quiet western and an active eastern part.
    Keywords: 550 - Earth sciences
    Language: English
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  • 136
    Publication Date: 2020-02-12
    Language: German , English
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  • 137
    Publication Date: 2020-02-12
    Description: Dynamite shots of the crustal-scale refraction seismic project ALP 2002 were recorded by an array of 40 seismological three-component stations on the TRANSALP profile. These observations provide a direct link between the two deep seismic projects. We report preliminary results obtained from these data. In a first approach, we verified the TRANSALP refraction seismic velocity model computing travel times for several shots and comparing them to the new observations. The results generally confirm this model. Significant first-break travel time differences in and near the Tauern Window are explained by anisotropy. Large-scale features of the model, particularly the Moho structure, seem to be continuous towards the east. Travel time residuals of wide-angle reflections indicate a slight eastward dip component of the Adriatic Moho.
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  • 138
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    IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado
    Publication Date: 2020-02-12
    Language: English
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  • 139
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    In:  Geophysical Journal International
    Publication Date: 2020-02-12
    Description: Teleseismic P-wave tomography has revealed a columnar low-velocity anomaly in the upper mantle below the volcanic Eifel region in western Germany extending to at least 400 km depth. Here we explore whether a geodynamically consistent model of a mantle plume can explain the observed traveltime residuals. We use a 3-D mantle convection code with temperature and pressure-dependent viscosity to generate a suite of model plumes that rise from the transition zone and spread below a stationary or drifting lithospheric plate. We use ray tracing to calculate synthetic travel times and vary the plume location, radius, temperature and the rate and direction of plate motion in order to fit the observed travel times. Our results show a fair correlation between synthetic and observed traveltime residuals. The presence of additional structures in the lithosphere and upper mantle of the Eifel region that are not covered by a simple plume model prevents a perfect fit of the observed seismological data and may bias to some degree the derived plume parameters. The traveltime anomalies are mainly caused by the plume stem with smaller contributions from the plume head. Models with and without an axisymetric plume head below the lithosphere fit the data almost equally well and we conclude that the absence of a plume head in tomographic images does not rule out its existence. In the best-fitting model the plume stem has a radius of 60 km and rises about 50 km to the SW of the quaternary volcanic field below a lithosphere that this slowly moving in the NNE direction. The temperature of the plume and its flux cannot be constrained tightly from our model results, but combining them with other constraints we estimate an excess temperature of ∼200°C and a buoyancy flux of 500–1000 kg s−1.
    Language: English
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  • 140
    Publication Date: 2020-02-12
    Language: English
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  • 141
    Publication Date: 2020-02-12
    Description: Seismic anisotropy, a property linked to the texture of the mantle rock, should be distributed with depth along the trace of the Dead Sea Rift (DSR), owing to a combination of present day and ancient tectonics. Using data from four permanent and one temporary seismic observatories we evaluate birefringence (splitting) of 91 teleseismic core-refracted shear waves, primarily SKS phases. We find significant levels of birefringence in the bulk of observed phases. We also find that birefringence parameters (fast directions and delays) vary as a function of source–receiver geometry. Notably, the pattern of this directional variation in birefringence is quite similar at all sites we have examined. We interpret observed birefringence in SKS phases in terms of one- and two-layer models. Single-layer models for all stations exhibit a fast polarization oriented 12–19° east of north, with anisotropy sufficient to generate 1.3-s time delay. We find strong evidence for at least two distinct anisotropic layers. For the two layer models, the upper layers resemble the single-layer models, showing near-north fast polarizations and delays on the order of 1 s. Three out of four sites show fast polarizations in the lower layer that strike 50–80° CW from north with time delays 0.3–0.6 s. One site, at the northern end of the DSR, displays a higher degree of anisotropy in the lower layer, and a more northerly fast polarization. Overall, the lower layers at all sites appear to be consistent with the deformation caused by plate motion relative to the asthenosphere. The fabric in the upper layer is sub-parallel to the present-day transcurrent motion on the DSR, but also matches the typical orientation of lithospheric seismic anisotropy in the Arabian shield. Our overall conclusion is that the impact of the DSR on the rock fabric of the mantle lithosphere is probably quite weak.
    Language: English
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  • 142
    Publication Date: 2020-02-12
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  • 143
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    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Publication Date: 2020-02-12
    Language: English
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  • 144
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    International Association of Seismology and Physics of the Earth's Interior (IASPEI)
    In:  IASPEI Annual Report
    Publication Date: 2020-02-12
    Language: English
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  • 145
    Publication Date: 2020-02-12
    Language: English
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  • 146
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    In:  Scientific Drilling
    Publication Date: 2020-02-12
    Language: English
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  • 147
    Publication Date: 2020-02-12
    Description: A seismicity and stress field analysis of a region in NE Bavaria reveals a complex picture of seismic dislocation. The magnitudes are generally low, the strongest event recorded had a magnitude of 2.3. In the southern part of the area investigated, earthquakes occur very rarely. During the observation period of approximately four years, only four events, two of them forming a doublet, were recorded. Hypocentral depths in the southern part are considerably great (15 to 17 km) and indicate a mafic lower crust. The seismicity of the Marktredwitz area, located in the western extension of the Eger rift, is dominated by earthquake swarms that are strongly clustered in space and time. The swarms occurred at depths between 10 and 14 km. Precise relative relocations show clear planar arrangements of the hypocentres and enable to identify the orientation of active fault planes. A comparison of the structural and geomorphological settings reveals major similarities in the occurrence of earthquake swarms compared to the situation in the bordering Vogtland/NW-Bohemia swarm area.
    Language: English
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  • 148
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    DWA
    In:  Forum für Hydrologie und Wasserbewirtschaftung
    Publication Date: 2020-02-12
    Description: Der Band dokumentiert ausführlich 17 Referate und Diskussionsbeiträge des Workshops, der im Rahmen des BMBF-Förderschwerpunkt "Risikomanagement extremer Hochwasserereignisse" 2006 an der Univ. Trier veranstaltet wurde. Die Beiträge lassen sich 5 thematischen Blöcken zuordnen: 1. Konzepten (vorgestellt werden u.a. Fuzzy-Modelle) und 2. Anwendungsbeispielen und Modellkalibrierung von Niederschlag-Abfluss-Modellen. Innerhalb dieser Session wird ein sehr breites Spektrum an konkreten Modellanwendungen vorgestellt. Der 3. Themenblock befasst sich mit der Modellkopplung und der Integration von Fernerkundungsdaten, der 4. mit Extremen Abflüssen: Herleitung, Simulation, Bemessung, der 5. Themenblock mit Modellidentifikation und Modellunsicherheit.
    Language: German , English
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  • 149
    Publication Date: 2020-02-12
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  • 150
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    In:  The Andes - Active Subduction Orogeny | Frontiers in Earth Sciences
    Publication Date: 2020-02-12
    Description: The Andes were formed by Cenozoic tectonic shortening of the South American plate margin overriding the subducting Nazca Plate. Using coupled, thermo-mechanical, numerical modeling of the dynamic interaction between subducting and overriding plates, we searched for factors controlling the intensity of the tectonic shortening. From our modeling, constrained by geological and geophysical observations, we infer that the most important factor was fast and accelerating (from 2 to 3 cm yr(hoch)-1) westward drift of the South American Plate, whereas possible changes in the convergence rate were not as important. Other important factors are the crustal structure of the overriding plate and the shear coupling at the plate interface. The model in which the South American Plate has a thick (40-45 km at 35 Ma) crust and relatively high friction coefficient (0.05) at the Nazca-South American plate interface generates more than 300 km of tectonic shortening over the past 35 million years and replicates well the crustal structure and evolution of the high Central Andes, However, modeling does not confirm that possible climate-controlled changes to the sedimentary trench-fill during the last 30 million years might have significantly influenced the upperplate shortening rate. The model with initially thinner (less than 40 km) continental crust and a lower friction coefficient (less than 0.015) results in less than 40 ikm of shortening in the South American Plate, replicating the situation in the Southern Andes. During upper-plate deformation, the processes that cause a reduction in lithospheric strength and an increase in interplate coupling are particularly important. The most significant of these processes appears to be: (1) delamination of the lower crust and mantle lithosphere, driven by gabbro-eclogite transformation in the thickening lower crust, and (2) mechanical failure of the foreland sediments. The modeling demonstrates that delaminating lithosphere interacts with subduction-zone corner flow, influencing both the rate of tectonic shortening and magmatic-arc productivity, and suggests an anti-correlation between these two parameters. Our model also predicts that the down-dip limit of the frictional coupling domain between the Nazca and South American Plates should be ~15-20 km deeper in the Southern Andes (south of 28° S) compared to the high Central Andes, which is consistent with GPS and seismological observations.
    Keywords: 550 - Earth sciences
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  • 151
    Publication Date: 2020-02-12
    Description: This paper combines observations of seismicity, gravity, topography and thermal and velocity structures to investigate the rheological properties of the lithosphere in the Lake Baikal region. We examine the seismogenic thickness (Ts) using 25 earthquakes of Mw 5.1–7.1, whose full source parameters have been determined by inversion of teleseismic waveforms, 13 of which are presented here for the first time. These 25 events, plus six others (Mw 5.0–5.8) whose depths are well constrained, show that moderate earthquakes occur at depths up to ∼30 km in the northeast Baikal rift. Based on the teleseismic waveform modelling results and published relocations of microearthquakes using regional networks, we conclude that the mantle is not a significant source of seismicity in the Baikal region. Using the admittance between free-air gravity and topography, we estimate the effective elastic thickness (Te) in the region to be between 5 and 20 km. Nowhere do the data require that Te 〉 Ts, consistent with the simple interpretation that the long-term strength of the lithosphere resides in its seismogenic layer. A weak mantle in the Baikal region can be explained by its high temperature, which we estimate by combining local geotherm estimates with the regional upper mantle velocity structure, obtained from fundamental and higher-mode surface waves. Geotherms are fitted to pressure and temperature estimates from mantle nodules at four sites, both within and outside the Siberian shield. In order to constrain the temperatures at the Moho, we estimated crustal thicknesses using teleseismic receiver functions. Moho temperatures are estimated to exceed ∼550°C beneath the Siberian shield and are higher in the more recently deformed mountain belts to the south. Based on a reassessment of oceanic geotherms and seismicity, it seems likely, therefore, that the mantle in the Baikal region is too hot to be a source of long-term strength. This is consistent with the recent suggestion that the distribution of mantle seismicity in both the oceans and the continents is dependent on temperature alone. Finally, we note that results from S-wave tomography studies, combined with the observed locations of rift-related earthquakes, lead us to suspect that the frequently published position of the edge to the Siberian shield at the surface provides a poor description of that same boundary at depth.
    Language: English
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  • 152
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    In:  Geophysical Journal International
    Publication Date: 2020-02-12
    Description: Receiver functions (RF) are used to investigate the upper mantle structure beneath the Eifel, the youngest volcanic area of Central Europe. Data from 96 teleseismic events recorded by 242 seismological stations from permanent and a temporary network has been analysed. The temporary network operated from 1997 November to 1998 June and covered an area of approximately 400 × 250 km2 centred on the Eifel volcanic fields. The average Moho depth in the Eifel is approximately 30 km, thinning to ca. 28 km under the Eifel volcanic fields. RF images suggest the existence of a low velocity zone at about 60–90 km depth under the West Eifel. This observation is supported by P- and S-wave tomographic results and absorption (but the array aperture limits the resolution of the tomographic methods to the upper 400 km). There are also indications for a zone of elevated velocities at around 200 km depth, again in agreement with S-wave and absorption tomographic results. This anomaly is not visible in P-wave tomography and could be due to S-wave anisotropy. The RF anomalies at the Moho, at 60–90 km, and near 200 km depth have a lateral extent of about 100 km. The 410 km discontinuity under the Eifel is depressed by 15–25 km, which could be explained by a maximum temperature increase of +200°C to +300°C. In the 3-D RF image of the Eifel Plume we also notice two additional currently unexplained conversions between 410 and 550 km depth. They could represent remnants of previous subduction or anomalies due to delayed phase changes. The lateral extent of these conversions and the depression of the 410 km discontinuity is about 200 km. The 660 km discontinuity does not show any depth deviation from its expected value. Our observations are consistent with interpretation in terms of an upper mantle plume but they do not rule out connections to processes at larger depth.
    Keywords: 550 - Earth sciences
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  • 153
    Publication Date: 2020-02-12
    Description: The Variscan orogeny, resulting from the collision of Laurussia with Gondwana to form the supercontinent of Pangaea, was followed by a period of crustal instability and re-equilibration throughout Western and Central Europe. An extensive and significant phase of Permo-Carboniferous magmatism led to the extrusion of thick volcanic successions across the region (e.g. NE German Basin, NW part of the Polish Basin, Oslo Rift, northern Spain). Coeval transtensional activity led to the formation of more than 70 rift basins across the region. The various basins differ in terms of their form and infill according to their position relative to the Variscan orogen (i.e. internide or externide location) and to the controls that acted on basin development (e.g. basement structure configuration). This paper provides an overview of a variety of basin types, to more fully explore the controls upon the tectonomagmatic-sedimentary evolution of these important basins.
    Language: English
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  • 154
    Publication Date: 2020-02-12
    Language: English
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  • 155
    Publication Date: 2020-11-25
    Description: This paper describes an unsupervised classifier for polarimetric interferometric SAR (PolInSAR) data. Expectation maximisation is used to estimate class parameters that maximise the probability of a dataset for a given number of classes. Polarimetric information, in the form of coherency matrices, and interferometric information, in the form of complex coherences, is taken into account. Phase differentials between complex coherences in different polarisation bases are used to make the classifier sensitive to the vertical structure of the scene under observation, and a distribution of such phase differentials is developed. The classifier is self initialising in that it does not rely on decompositions or thresholds. Classification results based on real data are presented and discussed
    Language: English
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  • 156
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    Deutsches GeoForschungsZentrum GFZ
    In:  Scientific Technical Report STR
    Publication Date: 2021-08-21
    Description: A set of 59 seismological stations was deployed in the Central Andes region at 21°S (Chile-Bolivia) along a profile ~600 km long and were operated between 2002 and 2004. The teleseismic tomographic images (from P- and S- waves) show low-velocity anomalies that are interpreted as the effects of melting or fluids at both flanks of the Altiplano plateau. Beneath the Central Volcanic Zone (CVZ) a low-velocity anomaly is interpreted to be caused by fluids that are the origin of the volcanic material from the CVZ. A low-velocity anomaly in the upper crust is interpreted as the Altiplano Low-Velocity Zone that appears to extend as far to the east as the Eastern Cordillera. A high-velocity body between 100 km and 150 km depth is interpreted as being part of the old cold lithosphere that detached from the base of the crust. The Brazilian Shield is thought to be responsible for the strong high-velocity anomaly on the eastern side of the Central Andes. In addition, another set of 19 stations was deployed in the southern Argentine Puna along a profile ~200 km long and were run over the same period of time (2002-2004). The intention was to study the crustal thickness at 25.5°S, where delamination of the lithosphere was proposed to explain the higher elevation of the Puna plateau. Beneath the plateau a negative velocity anomaly is observed and interpreted here as being the location of fluid transfer between the deeper and shallower portions of the crust, that emanate from the Benioff zone at depths of ~200 km. This anomaly clearly divides in two branches: one to the west towards the volcanic arc (CVZ) and the other to the east where the back-arc volcanoes are located. On their way to lower depths, the fluid paths are probably influenced by the presence of nearby isotherms. The bifurcation of the ascending path could be related to the presence of the lithosphere-asthenosphere boundary (LAB) at ~100-130 km. Based on our observations, the type and form of the anomaly, it is possible to propose the presence of a return-flow type model for fluid ascent in contraposition to the assumed corner-flow model usually proposed for the Andes. The fluids that cause the seismic anomalies beneath the Puna plateau are generated at deeper levels in the asthenosphere and ascend parallel to the oceanic slab in the manner of a return-flow. In the crust and beneath the Salar de Antofalla (SA), a high-velocity block with seismic activity is interpreted as part of the old and cold Palaeozoic magmatic arc (Faja Eruptiva de la Puna Occidental). The presence of this block is may be responsible for the distribution of volcanic activity localized at both sides of this anomaly. Eastern of the SA, it is possible to recognize a zone with low-velocities beneath the Galan volcano. A sharp limit imposed by high velocities, probably related to metamorphic rocks from the Paleozoic basement (Tacuil and Luracatao ranges) can be detected on the east of the profile. A high-velocity block with seismic activity is located in the crust beneath the Salar de Antofalla (SA) and interpreted as part of the old and cold Palaeozoic magmatic arc (Faja Eruptiva de la Puna Occidental). This block might be responsible for the distribution of volcanic activity localized at both sides of this anomaly. Beneath the Galan volcano and east of the SA, a zone with low-velocities can be recognized. A sharp limit towards high-velocities can be observed on the east of the profile, probably related to metamorphic rocks from the Palaeozoic basement (Tacuil and Luracatao ranges).
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  • 157
    Publication Date: 2020-02-12
    Language: English
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  • 158
    Publication Date: 2022-02-18
    Description: The history of petroleum exploration in central Australia has been enlivened by vigorous debate about the source(s) of the oil and condensate found in the Cooper/Eromanga basin couplet. While early workers quickly recognized the source potential of thick Permian coal seams in the Patchawarra and Toolachee Formations, it took some time for the Jurassic Birkhead Formation and the Cretaceous Murta Formation to become accepted as effective source rocks. Although initially an exploration target, the Cambrian sediments of the underlying Warburton Basin subsequently were never seriously considered to have participated in the oil play, possibly due to a lack of subsurface information as a consequence of limited penetration by only a few widely spaced wells. Dismissal of the Warburton sequence as a source of hydrocarbons was based on its low generative potential as measured by total organic carbon (TOC) and Rock-Eval pyrolysis analyses. As most of the core samples analysed came from the upper part of the basin succession that has been subjected to severe weathering and oxidation, these results might not reflect the true nature of the Warburton Basin’s source rocks. We analysed a suite of source rock extracts, DST oils and sequentially extracted reservoir bitumens from the Gidgealpa field for conventional hydrocarbon biomarkers as well as nitrogen-containing carbazoles. The resulting data show that organic facies is the main control on the distribution of alkylated carbazoles in source rock extracts, oils and sequentially extracted bitumens. The distribution pattern of alkylcarbazoles allows to distinguish between rocks of Jurassic, Permian and pre-Permian age, thereby exceeding the specificity of hydrocarbon biomarkers. While no pre-Permian signature can be found in the DST oils, it is present in sequentially extracted residual oils. However, the pre-Permian molecular source signal is diluted beyond recognition during conventional extraction procedures. The bitumens that are characterised by a pre-Permian geochemical signature derive from differing pore-filling oil pulses and exhibit calculated maturities of up to 1.6% Rc, thereby proving for the first time the petroleum generative capability of source rocks in the Warburton Basin.
    Language: English
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  • 159
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    GFZ German Research Centre for Geosciences
    Publication Date: 2022-03-28
    Description: The IPOC seismic network is part of the Integrated Plate boundary Observatory Chile (IPOC), a European-Chilean network of institutions and scientists organizing and operating a distributed system of instruments and projects dedicated to the study of earthquakes and deformation at the continental margin of Chile. In particular, the seismic network is jointly operated by the GFZ German Research Centre for Geosciences, Potsdam, Germany; the Institut de Physique du Globe Paris, France (IPGP); the Chilean National Seismological Centre (CSN); the Universidad de Chile, Santiago, Chile (UdC); and the Universidad Católica del Norte, Antofagasta, Chile (UCNA). The subduction plate boundary between the South American and the oceanic Nazca plates exhibits some of the largest earthquakes on Earth. The IPOC goal is to improve the understanding of both the physical mechanisms underlying these processes and the natural hazards induced by them. The observatory is designed to monitor the plate boundary system from the Peru-Chile border to south of the city of Antofagasta, from the coast to the high Andes, capturing both great and small earthquakes in this region. A key component of IPOC is its multi-parameter observatories, where at each site a suite of different physical parameters are measured continuously. So far about 20 such multi-parameter stations are installed. All of these sites are equipped with STS-2 broadband seismometers and accelerometers. Additional instrumentation at some of the stations includes continuous GPS, electric and magnetic field (MT), surface inclination, and climate (temperature, air pressure, humidity). Most sites transmit their data in near-real time using a suite of communication channels (VSAT, WiFi, telemetry etc.). Seismic instruments are deployed on concrete pedestals in bedrock caverns (a few meters deep) to measure ground shaking from earthquakes or other sources that last from a tiny fraction of a second to several hours. Strong-motion sensors are deployed next to the broadband sensors to increase the dynamic range and for earthquake engineering applications. Broadband data are freely distributed in real-time and archive data is also available. This DOI encompasses all IPOC seismic data; data is available under FDSN network code CX.
    Language: English
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  • 160
    Publication Date: 2020-02-12
    Language: English
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  • 161
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    Koordinationsstelle Risikomanagement extremer Hochwasser, GeoForschungsZentrum Potsdam
    Publication Date: 2020-02-12
    Keywords: 550 - Earth sciences
    Language: German , English
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  • 162
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    In:  River flow 2006 : proceedings of the International Conference on Fluvial Hydraulics, Lisbon, Portugal, 6 - 8 September 2006
    Publication Date: 2020-02-12
    Description: Many multipurpose reservoirs are situated in the low mountain range of Germany. Most of them are necessary for drinking water supply and flood protection as well. Other utilizations are recreation, water power and the downstream low water regulation during dry seasons. The operation rules of the reser-voirs have to be optimized to meet the different requirements of use. One tool within this framework is a management system for river basins including all reservoirs and their specific operation rules affecting the downstream reaches. As an optimization objective for instance the minimization of inundation risks can be defined. In this case the risk can be defined as hydraulic and hydrologic safety of the reservoir itself and the risk due to inundation and damaging in the downstream regions. Considering the European Water Framework Directive the ecological aspect of reservoir management is one more point in the optimization process. To es-tablish a pilot project the software TALSIM will be applied to river catchments in the ore mountains (Saxony).
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  • 163
    Publication Date: 2020-02-12
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  • 164
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    In:  Scientific Drilling
    Publication Date: 2020-02-12
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  • 165
    Publication Date: 2020-02-12
    Description: [1] We study the origin of the background seismic noise averaged over long time by cross correlating of the vertical component of motion, which were first normalized by 1-bit coding. We use 1 year of recording at several stations of networks located in North America, western Europe, and Tanzania. We measure normalized amplitudes of Rayleigh waves reconstructed from correlation for all available station to station paths within the networks for positive and negative correlation times to determine the seasonally averaged azimuthal distribution of normalized background energy flow (NBEF) through the networks. We perform the analysis for the two spectral bands corresponding to the primary (10–20 s) and secondary (5–10 s) microseism and also for the 20–40 s band. The direction of the NBEF for the strongest spectral peak between 5 and 10 s is found to be very stable in time with signal mostly coming from the coastline, confirming that the secondary microseism is generated by the nonlinear interaction of the ocean swell with the coast. At the same time, the NBEF in the band of the primary microseism (10–20 s) has a very clear seasonal variability very similar to the behavior of the long-period (20–40 s) noise. This suggests that contrary to the secondary microseism, the primary microseism is not produced by a direct effect of the swell incident on coastlines but rather by the same process that generates the longer-period noise. By simultaneously analyzing networks in California, eastern United States, Europe, and Tanzania we are able to identify main source regions of the 10–20 s noise. They are located in the northern Atlantic and in the northern Pacific during the winter and in the Indian Ocean and in southern Pacific during the summer. These distributions of sources share a great similarity with the map of average ocean wave height map obtained by TOPEX-Poseidon. This suggests that the seismic noise for periods larger than 10 s is clearly related to ocean wave activity in deep water. The mechanism of its generation is likely to be similar to the one proposed for larger periods, namely, infragravity ocean waves.
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  • 166
    Publication Date: 2020-02-12
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  • 167
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    Institut für Wasserbau und Wasserwirtschaft, Technische Universität
    Publication Date: 2020-02-12
    Language: English
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  • 168
    Publication Date: 2020-02-12
    Description: In 2000, a consortium of European and North American institutions completed a huge active source seismic experiment focused on central Europe, the Central European Lithospheric Experiment Based on Refraction or CELEBRATION 2000. This experiment primarily consisted of a network of seismic refraction profiles that extended from the East European craton, along and across the Trans-European suture zone region in Poland to the Bohemian massif, and through the Carpathians and eastern Alps to the Pannonian basin. The longest profile CEL05 (1420 km) is the focus of this paper. The resulting two-dimensional tomographic and ray-tracing models show strong variations in crustal and lower lithospheric structure. Clear crustal thickening from the Pannonian basin (24–25 km thick) to the Trans-European suture zone region (∼50 km), together with the configuration of the lower lithospheric reflectors, suggests northward subduction of mantle underlying Carpathian-Pannonian plate under the European plate. This, however, conflicts with strong geological evidence for southward subduction, and we present three tectonic models that are to not totally mutually exclusive, to explain the lithospheric structure of the area: (1) northward “old” subduction of the Pannonian lithosphere under the East European craton in the Jurassic–Lower Cretaceous, (2) a collisional zone containing a “crocodile” structure where Carpatho-Pannonian upper crust is obducting over the crystalline crust of the East European craton and the Carpathian-Pannonian mantle lithosphere is underthrusting cratonic lower crust, and (3) lithosphere thinning due to the effects of Neogene extension and heating with the slab associated with “young” subduction southward in the Miocene having been either detached and/or rolled back to the east. In the last case, the northwestward dipping in the lithosphere can be interpreted as being due to isotherms that could represent the lithosphere/asthenosphere boundary in the Pannonian region.
    Language: English
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  • 169
    Publication Date: 2020-02-12
    Description: [1] We present a continuous analysis of the background oscillations of the Earth. We processed five years of vertical recordings from the German Regional Seismic Network (GRSN) and estimated the directions of arrival (DOA) of the background Rayleigh waves in the frequency range between 5 and 8 mHz. We find clear seasonal variations in the direction of propagation and a striking rate of recurrence in these seasonal patterns. This seasonality provides evidence of an excitation of the background oscillations by large-scale atmospheric and/or oceanic processes which confirms previous studies.
    Language: English
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  • 170
    Publication Date: 2020-02-12
    Description: We use the S receiver function method to study the lithosphere at the Dead Sea Transform (DST). A temporary network of 22 seismic broad-band stations was operated on both sides of the DST from 2000 to 2001 as part of the DESERT project. We also used data from six additional permanent broad-band seismic stations at the DST and in the surrounding area, that is, in Turkey, Saudi Arabia, Egypt and Cyprus. Clear S-to-P converted phases from the crust-mantle boundary (Moho) and a deeper discontinuity, which we interpret as lithosphere- asthenosphere boundary (LAB) have been observed. The Moho depth (30-38 km) obtained from S receiver functions agrees well with the results from P receiver functions and other geophysical data. We observe thinning of the lithosphere on the eastern side of the DST from 80 km in the north of the Dead Sea to about 65 km at the Gulf of Aqaba. On the western side of the DST, the few data indicate a thin LAB of about 65 km. For comparison, we found a 90-km-thick lithosphere in eastern Turkey and a 160-km-thick lithosphere under the Arabian shield, respectively. These observations support previous suggestions, based on xenolith data, heat flow observations, regional uplift history and geodynamic modelling, that the lithosphere around DST has been significantly thinned in the Late Cenozoic, likely following rifting and spreading of the Red Sea.
    Keywords: 550 - Earth sciences
    Language: English
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  • 171
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    IUGG Secretariat, CIRES Cooperative Institute for Research in Environmental Sciences, University of Colorado
    In:  IUGG Annual Report
    Publication Date: 2023-03-02
    Language: English
    Type: info:eu-repo/semantics/report
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  • 172
    Publication Date: 2023-06-16
    Description: The Aegean region overlies a complex tectonic regime that experiences a wide diversity of earthquake behaviour, with enormous disparity in focal mechanism and spatio-temporal distribution. Multiple random earthquake simulations, via Monte Carlo simulation, offer the opportunity to analyse seismic hazard across the Aegean, whilst still allowing for uncertainty in various parameters such as frequency-magnitude relation, maximum magnitude (Mmax) and attenuation relation. They may also enable meaningful determination of hazard (in terms of Peak Ground Acceleration (PGA) and MSK Intensity) with exceedence probabilities significantly smaller than those currently used in standard probabilistic seismic hazard assessment (PSHA) techniques. In addition, these simulations can also be used to conduct sensitivity analyses that will act as a verification process, allowing assumptions regarding the seismic hazard parameters to be continually tested. A catalogue of earthquakes in the Aegean (1900-1999AD) is used as a basis for fitting appropriate models of spatial distribution, frequency-magnitude relation and maximum-magnitude. This has been achieved by random re-sampling of the catalogue, and by random sampling from a Gutenberg-Richter relation fitted to the observed data. Simple hazard analyses for five cities within the Aegean have been undertaken using the earthquake simulations. PGA has been determined using appropriate attenuation relations, and its variability quantified. For each site, the PGA with a 10% probability of exceedence in 50 years is largely consistent with those of current hazard analyses. This may give the user additional confidence in the hazard determined for lower exceedence probabilities.
    Language: English
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  • 173
    Publication Date: 2021-08-16
    Description: Abstract
    Description: C/N mass ratios remain constant throughout MIS 3 and into MIS 2, with values between 6.3 and 8.9, indicating no significant terrestrial input of organic matter (Fig. 3). Low %TOC values during the interstadial increase from 0.4 to 0.7 between 57.8 and 43.7 kyr BP with a concurrent gradual increase in δ13C(organic) amid oscillations between −23.2‰ and −26.1‰ (Fig. 3). %TOC falls to 0.4 between 40.9 and 39.4 kyr BP whereas δ13C(organic) remains high at c. 24‰ with a peak value of −23.6‰ at 39.4 kyr BP. The subsequent two-stage increase in %TOC from 39 to 37.9 kyr BP and between 37.3 and 36.9 kyr BP is marked by a period of δ13C(organic) lowering to c. −26.6‰ before δ13C(organic) increases after 37.9 kyr BP to −24.8‰, values comparable to those prior to the %TOC decline at 40.9 kyr BP.
    Keywords: Vereshchagin Long Cores Expedition 2001 ; R/V Vereshchagin ; δ13C ; age (calendar years) ; AMS ; calculation ; Carbon/Nitrogen ratio ; correlation of paleointensity records ; total organic carbon ; AMS
    Language: English
    Type: Dataset , Dataset
    Format: 400 Datapoints
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  • 174
    Publication Date: 2022-05-13
    Description: Abstract
    Description: Down-core variations of the high-resolution magnetic susceptibility (0.1 cm steps)have been obtained for kasten and pilot cores from sites CON01-603 and CON01-605. This allowed the transfer of AMS 14C dating performed on kasten cores to the performed on kasten cores to the pilot cores subjected to paleomagnetic investigations. Note the discrepancies in the magnetic susceptibility curves from the pilot core from site CON 01-605 (Vydrino Shoulder) measured in 2001 and 2003, respectively (right). Several large peaks visible in the first measurement from 2001 (dashed lines) disappeared after a 2-year-long storage. This is a first hint for the presence the ferromagnetic, chemically unstable greigite.
    Keywords: Vereshchagin Long Cores Expedition 2001 ; R/V Vereshchagin ; magnetic susceptibility ; loop sensor
    Language: English
    Type: Dataset , Dataset
    Format: 9666 Datapoints
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  • 175
    Call number: PIK P 113-18-91627
    Type of Medium: Monograph available for loan
    Pages: 558 Seiten , Ill., graph. Darst., Kt.
    ISBN: 926410951X
    Series Statement: Energy efficiency policy profiles
    Language: English
    Location: A 18 - must be ordered
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  • 176
    Call number: AWI NBM-17-90885
    Description / Table of Contents: While researching for another film, filmmakers Tom Radford and Peter Raymont came across the story of Nugliak, an Inuvialuit man born just before the end of the 19th century who observed and wrote of the changes that occurred in the north during his lifetime on Herschel Island. Radford's film loosely follows the book, touching on much the same subjects, but using Nugliak's descendents as a link to the present.
    Description / Table of Contents: It is easy to overlook Herschel Island - a tiny speck of land just off the Yukon coast - where the Inuvialuit hunter Nuligak once followed the great journeys of caribou, polar bears, and whales. The island lays silently on the margins of geography, entrapped in the footnotes of history, a forgotten place frozen in time. And yet just over a century ago Herschel Island was a frontier boomtown, branded "the Sodom of the Arctic" by some visitors at the time. A place cohabited by whalers, Inuit, missionaries, and police; a place of contact and conflict; a place where worlds collided and lives were changed forever. It was on Herschel Island that a young Inucialuit boy, Nuligak (later named Bob Cockney by the missionaries) came of age - fascinated by Herschel, but equally repelled by the excess of so-called civilization. Through Nuligak's touching yet tragic life-story expressed through his writings and echoed by his grandchildren's poignant return to the Island - we are offered a unique view into an often troubling past and a potentially hopeful future.
    Type of Medium: Non-book medium
    Pages: 1 videodisc , round, color and black and white ; 4 3/4 in , 116 min. (70 min. + 46 min.)
    Language: English
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  • 177
    Call number: 9784887041400 (ebook)
    Description / Table of Contents: PREFACE The characteristics of natural disasters in modern mega-cities have been complicated and diversified since the end of 20th century and originated not only from geo-physical and global changes of natural hazards, such as earthquakes, tsunami, floods, storms, landslides, and drought, but also from the recent structural changes of our post-industrial societies. In fact, the Japanese urban area has become more and more vulnerable to newly emerging risks of low probability but high consequence type (LPHC type), which have been induced technologically and socially in modern society. For example, the estimated damage exposed by the floods has increased five times during the past 20 years in terms of unit-exposed space (inundated area in the case of flooding). This is due to the high concentration of both population and social infrastructures in residential districts, in spite of the success in decreasing the total number of human casualties of flood disasters, thanks to the tremendous amount of investment in constructing such physical structural facilities as dams, dikes, banks, etc. In return, we unfortunately face the soaring marginal cost of reducing disaster risk up to an acceptable level. In addition, we have such a new type of multi-disasters in modern mega-cities that a single small-scale hazard episode in an urban area might trigger a series of "catastrophic disasters" in a cascading manner under current interwoven and complicated urban water systems, such as from a small-scale river channel up to a large-scale river embankment. There seems to be many cases in which "natural disasters with totally different characteristics may happen before people forget about the previous disasters", in contrast with the famous expression "natural disasters occur when people are not thinking about them". Until very recently, people used to take precautionary steps against storms and/or inundation disasters at their homes in accordance with the amount of rainfall or the rise of water in adjacent rivers, and would listen to radio or TV news reports that predicted the routes of typhoons, and would standby at their homes or work places. Nowadays, such self-help practices to reduce possible damage of disasters have waned, reflecting a public relience on the remarkable improvements in basic social infrastructure to prevent disasters. Our country seems to have been transformed into a "hands-off society of leaving the management responsibility to regulatory authorities" in which people wait until they receive warning information or evacuation orders from the local government who are specialized in disaster prevention. However, when we face unexpected or surprise conditions, ordinary citizens become unable to understand the nature of risks, partly due to the complex processes of the regulatory management systems specialized in current disaster prevention schemes. They stop making their own choices regarding proactive responses to the emerging risks that have been so-called socio-technologically or socioculturally constructed in our post-industrial society. In fact, newcomers who have migrated and settled in newly developed lowland areas that used to be flood plains tend to be unable to inherit past disaster experiences. They tend to claim more and more "safety measures of intensified structural facilities" as well as an expansion of the "disaster relief measures" in cases where local residents become victims. But they prefer to leave management judgment regarding distinction between "safety and danger" to governmental institutions, as indicated in our recent case studies on a series of catastrophic flood disasters, such as the 2000 Tokai Floods in Nagoya and the 2004 Niigata-Fukui Floods. This also leads to another management issue of the increase in social costs to deal with the unexpected nature of risks, even by taking a proper combination of both structural and non-structural measures depending on which level of risks the community and residents may accept in long-term. Moreover, we are concerned about this kind of emerging disaster risks growing larger and continuing to increase, as suggested by the recent IPCC reports of global and regional climate changes. Here appears an integrated risk management approach to deal with natural disasters as social risk phenomena in terms of enhancing a variety of proactive or participatory ways that governmental institutions, communities, and residents could jointly carry out proper risk management against newly emerging disaster risks. To make our modern societies sustainable in terms of our lives, socio-cultural assets, and environmental resources in this risk society, it is vital to create a kind of societal governance system resilient to unexpected or surprise disasters not only by promoting a proper understanding of the nature of "risks" in their community but also by strengthening their preparedness to "risks" in the whole cycle of disaster prevention, from the normal, emergency, and recovery phases . Japan's National Research Institute for Earth Science and Disaster Prevention (NIED) has launched a five-year research project (2001-2005) with the aim of making modern societies resilient, not only to a traditional flood but also to possible catastrophic disasters of low probability but high consequence (LPHC). The approach that NIED has tried to explore is necessarily a new type of integrated risk management that should be tailored to the emerging disaster risks of the LPHC type. This includes (1) shifting the management strategy from "disaster prevention with zero risk" to "disaster reduction with an acceptable risk", (2) integrating both structure and non-structure measures (hard and soft measures), and (3) creating a social platform to call for a wide range of stakeholders (governments, communities, residents, corporations, local groups, and NPOs) in planning, designing and implementing an integrated risk management plan resilient to LPHC disasters in both short- and long-term perspectives. In order to tackle these urgent tasks, a new team was formed on the basis of social and human sciences by adding fellows and guest researchers, unlike the conventional team of disaster scientists at the NIED. Then, the team began operations through close cooperation with outside research institutions such as the Disaster Prevention Research Institute of Kyoto University. Our research group has been developing such a participatory platform of disaster risk communication, called the Participatory Flood Risk Communication Support System (Pafrics), that can facilitate community-based participation in planning, designing and implementing processes for a better integrated flood risk management. Pafrics has been particularly developed by taking a number of research outcomes based on the social scientific studies concerning local people's flood risk perception and disaster prevention activities in their community through questionnaire surveys conducted by NIED. Currently, we believe that Pafrics has been developed to such a sufficient level as to be released on the Web, but it is still being repeatedly modified through trials and experiences with new aspects and episodes in new areas. This book intends to provide outcomes of those studies in three parts. The first part expresses some of the important conceptual and methodological issues associated with the "integrated approach of disaster risk management" toward resilient society to emerging disaster risks in mega-cities in Japan. Four types of "integration" are taken into consideration in most of the papers. They are (1) integration of hard (structural control facilities) and soft (institutions and information) measures for shifting the concept of "zero risk" to "an acceptable level of risk", (2) integration of precaution and emergency relief measures, (3) integration of governmental and local community activities toward residents' informed choice of disaster risks, and (4) integration of individual risk management programs towards handling multiple sources of hazards. All papers focus on both the natural and socio-cultural factors of integrated risk management and their uncertainties involved in our modern society, reflecting the recent inter disciplinary development in "risk analysis", "disaster sciences", "resource economics", and "public policy analysis". In the second part, all contributed papers are more or less associated with outcomes of case studies or the social surveys which NIED conducted since the start of the project. Those involved include the 2000 Tokai flood disaster, 2004 Fukui, Niigata Typhoon 23 disasters in Japan, as well as the 2005 Hurricane Catrena in the USA. Many important research topics are addressed in terms of public understanding or perception of disaster risks, public preparedness for reducing risks, attitude of local government officers engaging in disaster prevention, the role of volunteers in disaster prevention or relief activities, based on social scientific disciplines in relation to social psychology, disaster sociology, and disaster insurance and economics, etc. Those contributions are particularly important for the NIED project to look forward to making modern societies resilient to disasters of LPHC type by facilitating residents' participation to risk governance in local communities towards the informed choice of disaster risks. The final part presents a set of papers which illustrate the development of "Pafrics", and some of the lessons we learned from several trials of using Pafrics in workshops, meetings, and lectures. In order to disseminate our model of "Pafrics", several internet-accessible versions are already open on theWeb (http://www.pafrics.org), which is in Japanese for local residents, but a short English version is also available at the same Web site. Finally, we should stress again that all contributions in this book are, more or less, the outcome of joint efforts conducted by all members of the project. However, final responsibility of the views expressed in these chapters lies with the individual authors themselves. We are very grateful for a number of invaluable comments and suggestions provided by the members of advisory body to our project; Dr. Sachio Kubo (Pasco Corporation), Mr. Nobuyuki Kurita (NPO: Rescue Stock Yard), Dr. Kimio Meguro (Tokyo University), Mr. Yukiji Nishida (NPO: Rescue Stock Yard), Dr. Norio Okada (Kyoto University), Dr. Yugo Ono (Hokkaido University), Dr. Isao Takagi (Keio University), and Dr. Kentaro Yoshida (Tsukuba University). We also express our deep gratitude forMs. Reiko Shibakami, Ms. Reiko Kawamura, and other assistants for their sincere and endless effort to support our studies and preparation of these manuscripts during period of the project. We should be very pleased if this book could make a valuable contribution towards a new perspective of "integrated disaster risk management" and "disaster risk governance" in the future.
    Type of Medium: 12
    Pages: Online-Ressource (XIV, 227 Seiten) , Diagramme
    ISBN: 9784887041400
    URL: Cover
    Language: English
    Note: Part I: An integrated framework of disaster risk management --- An Integrated Risk Analysis Framework for Emerging Disaster Risks: Toward a better risk management of flood disaster in urban communities / S. Ikeda / pp. 1-21 --- Fundamental Characteristics of Flood Risk in Japan's Urban Areas / T. Sato / pp. 23-40 --- Integration Framework of Flood Risk Management: What should be integrated? / K. Seo / pp. 41-56 --- Public Preference and Willingness to Pay for Flood Risk Reduction / G. Zhai / pp. 57-87 --- New Mode of Risk Governance Enhanced by an e-community Platform / T. Nagasaka / pp. 89-107 --- Part II: Interdisciplinary studies of flood risk --- Uncertainty in Flood Risks and Public Understanding of Probable Rainfall / S. Shimokawa and Y. Takeuchi / pp. 109-119 --- Public Perception of Flood Risk and Community-based Disaster Preparedness / T. Motoyoshi / pp. 121-134 --- Residents' Perception about Disaster Prevention and Action for Risk Mitigation: The case of the Tokai flood in 2000 / K. Takao / pp. 135-151 --- Roles of Volunteers in Disaster Prevention: Implications of questionnaire and interview surveys / I. Suzuki / pp. 153-163 --- Issues and Attitudes of Local Government Officials for Flood Risk Management / K. Terumoto / pp. 165-176 --- The Niigata Flood in 2004 as a Flood Risk of "Low Probability but High Consequence" / T. Sato, T. Fukuzono, and S. Ikeda / pp. 177-192 --- Insurance Issues of Catastrophic Disasters in Japan: Lessons from the 2005 Hurricane Katrina Disaster / H. Tsubokawa / pp. 193-198 --- Part III: Pilot studies of implementing social platform of risk management in local community: Participatory flood risk communication support system (Pafrics) --- Participatory Flood Risk Communication Support System (Pafrics) / T. Fukuzono, T. Sato, Y. Takeuchi, K. Takao, S. Shimokawa, I. Suzuki, G. Zhai, K. Terumoto, T. Nagasaga, K. Seo, and S. Ikeda / pp. 199-211 --- Flood Risk Communication with Pafrics / Y. Takeuchi and I. Suzuki / pp. 213-224
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  • 178
    Call number: M 19.92942
    Type of Medium: Dissertations
    Pages: XVI, 190 Seiten , Illustrationen
    ISBN: 88-902361-0-8
    Language: English
    Branch Library: GFZ Library
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  • 179
    Call number: AWI G3-22-94800
    Type of Medium: Dissertations
    Pages: ix, 85 Seiten , Illustrationen
    Language: English
    Note: Dissertation, Universität Potsdam, 2006
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  • 180
    Call number: AWI G3-16-90175
    Type of Medium: Dissertations
    Pages: XIV, 162 S , Ill., graph. Darst , 25 cm
    ISBN: 3832250085 (kart.) , 9783832250089
    Series Statement: Berichte aus der Geowissenschaft
    Language: English
    Note: Zugl.: Helsinki, Univ., Diss., 2006
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  • 181
    Monograph available for loan
    Monograph available for loan
    Cambridge [u.a.] : Cambridge Univ. Press
    Call number: PIK E 719-16-90179
    Type of Medium: Monograph available for loan
    Pages: XVI, 260 Seiten , Diagramme , 23 cm
    ISBN: 0521573726 (hardcover) , 9780521573726 (hardcover) , 0521574900 (pbk.) , 9780521574907 (pbk.)
    Language: English
    Note: Contents: 1. The rule we live by ; 2. Habits of the mind ; 3. A taste for fairness ; 4. Covenants without sword ; 5. Informational cascades and unpopular norms ; 6. The evolution of a fairness norm
    Location: A 18 - must be ordered
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  • 182
    Call number: AWI G2-18-91973
    Type of Medium: Monograph available for loan
    Pages: 49 Seiten , Illustrationen
    Language: English
    Note: Table of Contents: Introduction. - Contact information. - List of participants. - Guidelines for presenters. - Registration. - Workshop program. - Hotel and workshop venues. - Travel information. - Abstracts. - Public lecture.
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  • 183
    Call number: ZSP-994
    Type of Medium: Series available for loan
    Pages: 21 x 21 cm
    ISSN: 1618-3703
    Former Title: Vorgänger: Zweijahresbericht / Stiftung Alfred-Wegener-Institut für Polar- und Meeresforschung
    Subsequent Title: Fortsetzung Zweijahresbericht ... / AWI, Alfred-Wegener-Institut für Polar- und Meeresforschung in der Helmholtz-Gemeinschaft
    Language: German , English
    Note: Erscheint alle 2 Jahre , Text in deutscher und englischer Sprache
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  • 184
    Monograph available for loan
    Monograph available for loan
    New York [u.a.] : Oxford University Press
    Type of Medium: Monograph available for loan
    Pages: XIV, 354 S , Ill., graph. Darst., Kt.
    ISBN: 0195154312 , 9780195154313
    Series Statement: Long-Term Ecological Research Network series
    Language: English
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  • 185
    Monograph available for loan
    Monograph available for loan
    Durham : Duke University Press
    Call number: RIFS 23.95610
    Type of Medium: Monograph available for loan
    Pages: 223 Seiten , 24 cm
    ISBN: 0822338610 , 0822339145 , 9780822338611 , 9780822339144
    Language: English
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  • 186
    Monograph available for loan
    Monograph available for loan
    Boca Raton, Fla. [u.a.] : Chapman & Hall/CRC
    Call number: IASS 16.90422
    Type of Medium: Monograph available for loan
    Pages: XVII, 392 Seiten , graph. Darst., Kt.
    ISBN: 1584884746 (hbk) , 9781584884743 (hbk)
    Series Statement: Texts in statistical science
    Language: English
    Branch Library: RIFS Library
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  • 187
    Call number: 9/M 07.0421(467)
    In: Geological Society Special Publication
    Description / Table of Contents: Gullies on Mars resemble terrestrial gullies involved in the transport of abundant material down steep slopes by liquid water. However, liquid water should not be stable at the Martian surface. The articles in this volume present the two main opposing theories for Martian gully formation: climate-driven melting of surficial water-ice deposits and seasonal dry-ice sublimation. The evidence presented ranges from remote-sensing observations, to experimental simulations, to comparison with Earth analogues. The opposing hypotheses imply either that Mars has been unusually wet in the last few million years or that it has remained a cold dry desert – both with profound implications for understanding the water budget of Mars and its habitability. The debate questions the limits of remote-sensing data and how we interpret active processes on extra-terrestrial planetary surfaces, even beyond those on Mars, as summarized by the review paper at the beginning of the book.
    Type of Medium: Monograph available for loan
    Pages: vi, 434 Seiten , Illustrationen
    ISBN: 978-1-78620-360-1
    Series Statement: Geological Society Special Publication 467
    Language: English
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  • 188
    Call number: 9/M 07.0421(471)
    In: Geological Society Special Publication
    Description / Table of Contents: Despite successful production from Carboniferous and Permian reservoirs in the southern North Sea and onshore Netherlands and Germany, Paleozoic hydrocarbon plays across parts of NW Europe remain relatively under-explored both onshore and offshore. This volume brings together new and previously unpublished knowledge about the Paleozoic plays of NW Europe to describe significant additional exploration opportunities outside and below existing plays. The volume contains papers on Paleozoic plays in the North Sea, Irish Sea, onshore UK, France and Switzerland. They highlight how improvements in seismic data quality and the availability of previously unpublished well datasets form the basis for improved understanding of local to regional interpretations that move forward from generalized basin development models. The improved structural trap and source rock basin definition feeds to better constrained, locally variable burial, uplift, maturation and migration models. Particularly notable are the significant mapped extents and thickness of Paleozoic source, reservoir and seal rocks in areas previously dismissed as regional highs and platforms.
    Type of Medium: Monograph available for loan
    Pages: vii, 398 Seiten , Illustrationen
    ISBN: 978-1-78620-395-3
    Series Statement: Geological Society Special Publication 471
    Language: English
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  • 189
    Monograph available for loan
    Monograph available for loan
    Boca Raton : Taylor & Francis
    Call number: AWI G8-22-95025
    Type of Medium: Monograph available for loan
    Pages: 575 Seiten , Illustrationen , 1 CD-ROM
    Edition: Second edition
    ISBN: 0-4152-6340-9
    Language: English
    Note: Contents Chapter 1 Introduction 1.1 Goals of this Book 1.2 Current Status of Resources 1.2.1 Ozone Hole 1.2.2 Water-Borne Soil Erosion 1.2.3 Loss of Biodiversity 1.3 Impact of Resource Degradation 1.4 Nature of Resource ;Degradation 1.5 Nature of Resource Management 1.5.1 Strategic Management 1.5.2 Process or Regional Management 1.5.3 Operational Management 1.5.4 Relationship between These Levels of Management 1.6 Nature of Regional Resource Management Information Systems 1.7 Geographic Information in Resource Management 1.8 Structure of this Book Reference Chapter2 Physical Principles of Remote Sensing 2.1 Introduction 2.2 Electromagnetic Radiation 2.2.1 Nature of Electromagnetic Radiation 2.2.2 Radiometric Terms and Definitions 2.2.3 Energy Radiated by the Sun and the Earth 2.2.4 Effects of the Atmosphere 2.2.5 Correction of Remotely Sensed Data for Attenuation through the Atmosphere 2.2.5 .1 Atmospheric Correction Using Field Data 2.2.5.2 Atmospheric Correction Using Numerical Atmospheric Models 2.2.6 Measurement of Radiance and Irradiance 2.2.6.1 Collecting Optics 2.2.6.2 Filter Unit 2.2.6.3 Detectors 2.2.6.4 Output Device 2.3 Interaction of Radiation with Matter 2.3.1 Nature of Reflectance 2.3.1.1 Reflectance within the Boundary Layer 2.3.2 Reflectance of Water Surfaces 2.3.3 Reflectance Characteristics of Soils 2.3.4 Reflectance of Vegetation 2.3.5 Reflectance Characteristics of Green Leaves 2.3.6 Reflectance Characteristics of Dead Leaves 2.3.7 Vegetative Canopy Reflectance 2.3.8 Bi-Directional Reflectance Distribution Function of Surfaces 2.4 Passive Sensing Systems 2.4.1 The Camera 2.4.1.1 Lens Cone 2.4.1.2 Magazine or Digital Back 2.4.1.3 Camera Body 2.4.1.4 Suspension Mount 2.4.1.5 Light Sensitive Cell Arrays 2.4.1.6 Measurement of Resolution in Image Data 2.4.2 Acquisition of Aerial Photography with a Framing Camera 2.4.2.1 Effects of Height Differences on an Aerial Photograph 2.4.2.2 Types of Lens Cones 2.4.3 The Scanner 2.4.4 The Moving Mirror Scanner 2.4.4.1 Resolution of Scanner Data 2.4.4.2 Thermal Scanner Data 2.4.4.3 Sources of Error in Oscillating Mirror Scanner Imagery 2.4.5 Push broom Scanners 2.5 Active Sensing Systems 2.5 .1 Introduction 2.5.2 The Geometry of Radar Systems 2.5 .2.1 Resolution of Radar Data 2.5.2.2 Effect of Height Displacements 2.5.3 The Attenuation and Scattering of Radar in the Atmosphere 2.5 .4 The Information Content of Radar Imagery 2.5.4.1 Surface Roughness and Slope 2.5.4.2 Inhomogeneity 2.5.4.3 Dielectric Properties 2.5.4.4 Resonance-Sized Objects 2.5.4.5 Wavelength 2.5.4.6 Polarisation 2.5.5 Radar Interferometry 2.5.6 Summary 2.6 Hyperspectral Image Data 2.6.1 Definition 2.6.2 Applications of Hyperspectral Image Data 2.7 Hypertemporal Image Data 2.7.1 Introduction 2.8 Platforms 2.8.1 Terrestrial Platforms 2.8.2 Balloon 2.8.3 Helicopter or Boat 2.8.4 Manned and Unmanned Aircraft 2.8.4.1 Hot Spots 2.8.5 Planning an Aerial Sortie 2.8.6 Satellite Platform 2.9 Satellite Sensor Systems Additional Reading References Chapter 3 Visual Interpretation and Map Reading 3.1 Overview 3.1.1 Remotely Sensed Data and Visual Interpretation 3.1.2 Effects of Height Differences on Remotely Sensed Images 3.2 Stereoscopy 3.2.1 Introduction 3.2.2 Monocular Vision 3.2.3 Binocular Vision 3.2.4 Binocular Perception of Colour 3.2.5 General Principles of Stereoscopic Vision 3.2.6 Methods of Stereoscopic Viewing 3.2.7 Physical Methods of Separation Using Stereoscopes 3.2.8 Viewing with a Stereoscope 3.2.9 Optical Methods of Separation 3.2.9.1 Coloured Anaglyph 3.2.9.2 Polarising Filters 3.2.10 Construction of a Stereo-Triplet 3.3 Measuring Height Differences in a Stereoscopic Pair of Photographs 3.3.1 Principle of the Floating Mark 3.3.2 Parallax Bar 3.3.3 Vertical Exaggeration 3.3.4 Displacements due to Height Differences man Aenal Photograph 3.3.5 Derivation of the Parallax Bar Formulae 3.3.6 Characteristics of the Parallax Bar Equation 3.4 Planimetric Measurements on Aerial Photographs 3.4.1 Introduction 3.4.2 Determination of Scale 3.4.3 Measurement of Distances 3.4.3.1 Graduated Rule or Scale 3.4.3.2 Paper Strip 3.4.3.3 Length of String 3.4.3.4 Odometer 3.4.4 Measurement of Areas 3.4.4.1 Dot Grid 3.4.4.2 Digitiser 3.4.5 Transfer of Planimetric Detail by the Use of the Anharmoruc Ratio 3.4.5.1 Paper Strip Method 3.4.5.2 Projective Nets 3.4.6 Proportional Dividers 3.5 Perception of Colour 3.6 Principles of Photographic Interpretation 3.6.1 Introduction 3.6.2 Levels of Interpretation 3.6.2.1 Image Reading 3.6.2.2 Image Analysis 3.6.2.3 Image Interpretation 3.6.3 Principles of Object Recognition 3.6.3.1 Size 3.6.3.2 Shape 3.6.3.3 Shadow 3.6.3.4 Colour or Tone 3.6.3 .5 Pattern and Texture 3.6.4 Interpretation Strategies 3.6.4.1 Location and Association 3.6.4.2 Temporal Change 3.6.4.3 Convergence of Evidence 3.6.5 Interpretation Procedure 3.7 Visual Interpretation of lmages 3.7.1 Visual Interpretation of Thermal Image Data 3.7.2 Visual Interpretation of Radar Image Data 3.8 Maps and Map Reading 3.8.1 Map Projections 3.8.1.1 Definition of the Mathematical Shape of the Portion of the Earth 3.8.1.2 Specify How the Curved Surface of the Earth is to be Unfolded onto a Flat Sheet 3.8.2 Mapping Systems and Map Types 3.8.3 Map Co-ordinates and Bearings 3.8.4 Establishing One's Location on a Map 3.8.5 Map Reading on a Topographic.Map 3.8.6 Terrain Classification Further Reading References Chapter4 Image Processing 4.1 Overview 4.1.1 Pre-Processing 4.1.2 Enhancement 4.1.3 Classification 4.1.4 Estimation 4.1.5 Temporal Analysis 4.2 Statistical Considerations 4.2.1 Probability Density Functions 4.2.1.1 Binomial Distribution 4.2.1.2 Normal Distribution 4.2.2 Correlation 4.2.3 Statistical Characteristics of Satellite Scanner Data 4.2.4 Measures of Distance 4.2.5 Shannon's Sampling Theorem 4.2.6 Autocorrelation and Variograms 4.2.7 Frequency Domain 4.2.7.1 Scaling 4.2.7.2 Shifting 4.2.7.3 Convolution 4.2.8 Least Squares Method of Fitting 4.3 Pre-Processing of Image Data 4.3.1 Introduction 4.3.2 Rectification 4.3.2.1 Theoretical Basis for Rectification 4.3.2.2 Correction for Systematic Errors 4.3.2.3 Fitting Image Data to Ground Control 4.3.2.4 Resampling the Image Data 4.3.2.5 Windowing and Mosaicing 4.3.2.6 Rectification in Practice 4.3 .3 Radiometric Calibration 4.3.4 Atmospheric Correction 4.3.4.1 Use of a Linear Model for Atmospheric Correction 4.3.4.2 Atmospheric Correction Using Atmospheric Models 4.4 The Enhancement of Image Data 4.4.1 Radiometric Enhancement 4.4.1.1 Display of an Image 4.4.1.2 Pseudo-Colour Density Slice 4.4.1.3 Linear Enhancement 4.4.1.4 Non-Linear Enhancements 4.4.1.5 Piecewise Linear Stretch 4.4.1.6 Histogram Equalisation 4.4.2 Spectral Enhancements 4.4.2.1 Ratioing 4.4.2.2 Orthogonal Transformations 4.4.2.3 Vegetation Indices 4.4.2.4 Fourier Transformation 4.4.3 Spatial Transformations of Image Data 4.4.3.1 Measurement of Texture 4.4.3.2 Edge Detection 4.4.3.3 Removal of Regular Noise in Image Data 4.4.3.4 Analysis of Spatial Correlation: The Variogram 4.4.3.5 Image Segmentation 4.4.3 .6 Object Patterns and Object Sizes: The ALV Function 4.4.4 Temporal Enhancements 4.4.4.1 Temporal Enhancement 4.4.4.2 Principal Components 4.4.4.3 Temporal Distance Images 4.4.4.4 Fourier Analysis of Hypertemporal Data 4.5 Analysis of Mixtures or End Member Analysis 4.5.1 Linear End Member Model 4.5.2 Characteristics of the Linear End Member Model 4.5.3 Identification of End Members 4.5.4 Implementation of the Linear End Member Algorithm 4.6 Image Classification 4.6.1 Principles of Classification 4.6.2 Discriminant Function Classifiers 4.6.2.1 Development of the Maximum Likelihood Classifier 4.6.2.2 Summary 4.6.2.3 Characteristics of the Discriminant Function Family of Classifiers 4.6.2.4 Implementation of the Maximum Likelihood Classifier 4.6.3 Fuzzy Classifiers 4.6.4 Neural Network Classifiers 4.6.5 Hierarchical Classifiers 4.6.6 Classification Strategies 4.6.6.1 Types of Classes 4.6.6.2 Selecting Classes and Classifiers 4.6.6.3 Im
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  • 190
    Call number: AWI G1-23-95188
    Description / Table of Contents: This book provides a sound introduction to the basic physical processes that dominate the workings of the Earth, its atmosphere and hydrosphere. It systematically introduces the physical processes involved in the Earth's systems without assuming an advanced physics or mathematical background.
    Type of Medium: Monograph available for loan
    Pages: XI, 321 Seiten , Illustrationen
    Edition: First published
    ISBN: 1405101733 , 1-4051-0173-3 , 9781405101738
    Language: English
    Note: Contents Preface Acknowledgments Chapter 1 Planet Earth and Earth systems 1.1 Comparative planetology 1.2 Unique Earth 1.3 Earth systems snapshots 1.4 Measuring Earth 1.5 Whole Earth 1.6 Subtle, interactive Earth Further reading Chapter 2 Matters of state and motion 2.1 Matters of state 2.2 Thermal matters 2.3 Quantity of matter 2.4 Motion matters: kinematics 2.5 Continuity: mass conservation of fluids Further reading Chapter 3 Forces and dynamics 3.1 Quantity of motion: momentum 3.2 Acceleration 3.3 Force, work, energy, and power 3.4 Thermal energy and mechanical work 3.5 Hydrostatic pressure 3.6 Buoyancy force 3.7 Inward acceleration 3.8 Rotation, vorticity, and Coriolis force 3.9 Viscosity 3.10 Viscous force 3.11 Turbulent force 3.12 Overall forces of fluid motion 3.13 Solid stress 3.14 Solid strain 3.15 Rheology Further reading Chapter 4 Flow, deformation, and transport 4.1 The origin of large-scale fluid flow 4.2 Fluid flow types 4.3 Fluid boundary layers 4.4 Laminar flow 4.5 Turbulent flow 4.6 Stratified flow 4.7 Particle settling 4.8 Particle transport by flows 4.9 Waves and liquids 4.10 Transport by waves 4.11 Granular gravity flow 4.12 Turbidity flows 4.13 Flow through porous and granular solids 4.14 Fractures 4.15 Faults 4.16 Solid bending, buckling, and folds 4.17 Seismic waves 4.18 Molecules in motion: kinetic theory, heat conduction, and diffusion 4.19 Heat transport by radiation 4.20 Heat transport by convection Further reading Chapter 5 Inner Earth processes and systems 5.1 Melting, magmas, and volcanoes 5.2 Plate tectonics Further reading Chapter 6 Outer Earth processes and systems 6.1 Atmosphere 6.2 Atmosphere-ocean interface 6.3 Atmosphere-land interface 6.4 Deep ocean 6.5 Shallow ocean 6.6 Ocean-land interface: coasts 6.7 Land surface Further reading Appendix Brief mathematical refresher or study guide Cookies Index
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  • 191
    Monograph available for loan
    Monograph available for loan
    New York, NY [u.a.] : Elsevier
    Call number: AWI G2-17-90655
    Type of Medium: Monograph available for loan
    Pages: S. 123-477 , Ill., graph. Darst., Kt
    ISSN: 0079-6611
    Series Statement: Progress in oceanography Vol. 71, No. 2-4
    Language: English
    Note: Contents: Structure and function of contemporary food webs on Arctic shelves: an introduction / P. Wassmann. - Past glacial and interglacial conditions in the Arctic Ocean and marginal seas - a review / D. A. Darby, L. Polyak and H. A. Bauch. - Climate variability and physical forcing of the food webs and the carbon budget on panarctic shelves / E. Carmack, D. Barber, J. Christensen, R. Macdonald, B. Rudels and E. Sakshaug. - Physical and biological characteristics of the pelagic system across Fram Strait to Kongsfjorden / H. Hop, S. Falk-Petersen, H. Svendsen, S. Kwasniewski, V. Pavlov, O. Pavlova and J. E. Søreide. - Food webs and carbon flux in the Barents Sea / P. Wassmann, M. Reigstad, T. Haug, B. Rudels, M. L. Carroll, H. Hop, G. W. Gabrielsen, S. Falk-Petersen, S. G. Denisenko, E. Arashkevich, D. Slagstad and O. Pavlova.
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  • 192
    Monograph available for loan
    Monograph available for loan
    Cambridge [u.a.] : Cambridge Univ. Press
    Call number: IASS 16.90617
    Type of Medium: Monograph available for loan
    Pages: XVII, 213 S.
    Edition: Digital pr., 1. paperback version
    ISBN: 0521030803 (pbk) , 9780521030809 (pbk) , 0521653185 (hbk) , 9780521653183 (hbk)
    Language: English
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  • 193
    Monograph available for loan
    Monograph available for loan
    Oxford [u.a.] : Oxford Univ. Press
    Call number: IASS 17.91071
    Type of Medium: Monograph available for loan
    Pages: 296 S , Ill., Kt , 24 cm
    ISBN: 0195183681 , 9780195183689
    Language: English
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  • 194
    Map available for loan
    Map available for loan
    Lower Hutt : Institute of Geological and Nuclear Sciences
    Associated volumes
    Call number: K 18.92018 / R7
    In: Institute of Geological & Nuclear Sciences 1:250.000 geological map, 13
    Type of Medium: Map available for loan
    Pages: 1 Karte , mehrfarbig , Expl. (vi, 70 Seiten) , 79 x 60 cm, gefaltet
    ISBN: 0-478-09925-8
    Series Statement: Institute of Geological and Nuclear Sciences 1:250.000 geological map 13
    Language: English
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  • 195
    Non-book medium
    Non-book medium
    [Herstellungsort nicht ermittelbar] : AMBERNET Ltd.
    Call number: AWI NBM-19-92576
    Type of Medium: Non-book medium
    Pages: 1 CD-ROM (circa 25 min) , farbig , 002500 , 12 cm
    Language: English
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  • 196
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    Monograph available for loan
    New York : Oxford Univ. Press
    Call number: IASS 20.94162
    Type of Medium: Monograph available for loan
    Pages: XII, 278 S , Ill , 24 cm
    ISBN: 9780195187434 , 0195187431 , 019518744X , 9780195187441
    Series Statement: Studies in feminist philosophy
    Language: English
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  • 197
    Monograph available for loan
    Monograph available for loan
    Amsterdam : Academic Press
    Call number: AWI Bio-21-94358
    Type of Medium: Monograph available for loan
    Pages: XV, 542 Seiten , Illustrationen
    Edition: second Edition
    ISBN: 0124555217 , 9780124555211
    Language: English
    Note: CONTENTS Preface Acknowledgments 1 Toward an Ecological Geography of the Sea The Progressive Exploration of Oceanic and Shelf Ecosystems The Availability of Timely Global Oceanographic Data from Satellites Internal Dynamics of Satellite-Observed Algal Blooms Our New Understanding of the Role of Very Small Organisms 2 Biogeographic Partition of the Ocean Taxonomic Diversity: The Shifting Baseline of Biogeography The Useful Results from 150 Years of Marine Biogeography Biogeographic Regions of the Pelagos Geographic Component of Benthic-Pelagic Coupling From Pristine to Modified Ecosystems 3 Fronts and Pycnoclines: Ecological Discontinuities Fronts and Frontal Systems Oceanic Fronts and Eddy Streets Shelf-Edge and Upwelling Fronts Tidal Fronts and River Plumes of the Shelf Seas The Ubiquitous "Horizontal Front" at the Shallow Pycnocline 4 Physical Control of Ecological Processes Ecological Consequences of Mesoscale Eddies and Planetary Waves Stratification and Irradiance: The Consequences of Latitude Regional and Latitudinal Resistance to Mixing in the Open Oceans Rule-Based Models of Ecological Response to External Forcing Case 1—Polar Irradiance-Mediated Production Peak Case 2—Nutrient-Limited Spring Production Peak Case 3—Winter-Spring Production with Nutrient Limitation Case 4—Small-Amplitude Response to Trade Wind Seasonality Case 5—Large-Amplitude Response to Monsoon-like Reversal of Trade Winds Case 6—Intermittent Production at Coastal Divergences Coastal Asymmetry, Geomorphology, and Tidal Forcing 5 Nutrient Limitation: The Example of Iron Nutrient Distribution and the Consequences of Differing Supply Ratios Regional Anomalies in Nutrient Limitation Models of Regional Nutrient Flux and Limitation 6 Biomes: The Primary Partition The Four Primary Biomes of the Upper Ocean Polar Biome Westerlies Biome Trades Biome Coastal Biome 7 Provinces: The Secondary Compartments Ecological Provinces in the Open Ocean Ways of Testing Static Province Boundaries in the Open Ocean A Statistical Test Analytical Tests Biogeographic Tests Practicable and Useful Partitions in Coastal Seas 8 Longer Term Responses: From Seasons to Centuries Scales of External Forcing Recurrent, ENSO-Scale Changes of State Multidecadal Trends and Changes Conclusion: Stable Partitions in a Varying Ocean? 9 The Atlantic Ocean Atlantic Polar Biome Boreal Polar Province (BPLR) Atlantic Arctic Province (ARCT) Atlantic Subarctic Province (SARC) Atlantic Westerly Winds Biome North Atlantic Drift Province (NADR) Gulf Stream Province (GFST) North Atlantic Subtropical Gyral Province (NAST-E, NAST-W) Mediterranean Sea, Black Sea Province (MEDI) Atlantic Trade Wind Biome North Atlantic Tropical Gyral Province (NATR) Caribbean Province (CARB) Western Tropical Atlantic Province (WTRA) Eastern Tropical Atlantic Province (ETRA) South Atlantic Gyral Province (SATL) Atlantic Coastal Biome Northeast Atlantic Shelves Province (NECS) Canary Current Coastal Province (CNRY) Guinea Current Coastal Province (GUIN) Benguela Current Coastal Province (BENG) Northwest Atlantic Shelves Province (NWCS) Guianas Coastal Province (GUIA) Brazil Current Coastal Province (BRAZ) Southwest Atlantic Shelves Province (FKLD) 10 The Indian Ocean Indian Ocean Trade Wind Biome Indian Monsoon Gyres Province (MONS) Indian South Subtropical Gyre Province (ISSG) Indian Ocean Coastal Biome Red Sea, Arabian Gulf Province (REDS) Northwest Arabian Sea Upwelling Province (ARAB) Western India Coastal Province (INDW) Eastern India Coastal Province (INDE) Eastern Africa Coastal Province (EAFR) Australia-Indonesia Coastal Province (AUSW) 11 The Pacific Ocean Pacific Polar Biome North Pacific Epicontinental Sea Province (BERS) Pacific Westerly Winds Biome Pacific Subarctic Gyres Province, East and West (PSAG) Kuroshio Current Province (KURO) North Pacific Subtropical and Polar Front Provinces (NPST and NPPF) Tasman Sea Province (TASM) Pacific Trade Winds Biome North Pacific Tropical Gyre Province (NPTG) North Pacific Equatorial Countercurrent Province (PNEC) Pacific Equatorial Divergence Province (PEQD) Western Pacific Warm Pool Province (WARM) Archipelagic Deep Basins Province (ARCH) South Pacific Subtropical Gyre Province, North and South (SPSG) Pacific Coastal Biome Alaska Coastal Downwelling Province (ALSK) California Current Province (CALC) Central American Coastal Province (CAMR) Humboldt Current Coastal Province (HUMB) China Sea Coastal Province (CHIN) Sunda-Arafura Shelves Province (SUND) East Australian Coastal Province (AUSE) New Zealand Coastal Province (NEWZ) 12 The Southern Ocean Antarctic Westerly Winds Biome South Subtropical Convergence Province (SSTC) Subantarctic Water Ring Province (SANT) Antarctic Polar Biome Antarctic Province (ANTA) Austral Polar Province (APLR) References Index
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  • 198
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    Monograph available for loan
    New York : Columbia University Press
    Call number: M 11.0335
    Description / Table of Contents: Contents: Part 1. Water in the Universe: From the Big Bang to the Appearance of Man 1. Beginnings2. The Churning of the Earth3. Origin and Evolution of Life4. Cosmic Catastrophes5. Ice, Moon, and PlanetsPart 2: Water in Today's World 6. Water and Energy Cycles7. Winds, waves, and currents8. Water's deep memories9. Clouds, rain, and angry skies10. Earth's water, between sky and seaPart 3: Water in Human History: Past and Future 11. Water and Man's Rise to Civilization12. Problems for the 21st Century13. Butterflies and humans in a warming greenhouse14. Back to the ice age?15. The end of the story
    Type of Medium: Monograph available for loan
    Pages: XIII, 312 S. , ill., maps , 24 cm
    ISBN: 9780231122450
    Uniform Title: Eaux du ciel.
    Classification:
    Hydrology
    Language: English
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  • 199
    Series available for loan
    Series available for loan
    Silver Spring, MD : U.S. Department of Commerce, National Oceanic and Atmospheric Administration, National Environmental Satellite, Data, and Information Service
    Associated volumes
    Call number: ZSP-582-59
    In: NOAA atlas NESDIS
    In: International ocean atlas and information series
    Description / Table of Contents: This Atlas and accompanying CD-ROM contains oceanographic data collected by the scientific specialists of the Academy of Sciences, Ministery of Fisheries, and the Hydrometeorological Service of Russia in the Sea of Azov and the adjacent part of the Black Sea during 1913 - 2004. Monthly data distribution plots are provided for each year. Monthly climatic maps of temperature and salinity at the sea surface and depth levels of 5 and 10 meters are computed using opjective analysis. Intra-annual variability of temperature and salinity of the Sea of Azov is discussed with respect to the quality control of the primary data. The Atlas also includes, in electronic format, selected copies of rare books and articles about the history of the Sea of Azov exploration and climate studies as well as photos, which provide information about the people and environment of this region.
    Type of Medium: Series available for loan
    Pages: 105 S. : graph. Darst., Kt. + 1 CD-ROM
    Series Statement: NOAA atlas NESDIS 59
    Language: English
    Note: Text. engl. und russ. - Teilw. in kyrill. Schr.
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  • 200
    Call number: AWI A12-13-0137
    Description / Table of Contents: The second edition of this internationally acclaimed text presents the latest developments in atmospheric science. It continues to be the premier text for both a rigorous and a complete treatment of the chemistry of the atmosphere, covering such pivotal topics as: chemistry of the stratosphere and troposphere; formation, growth, dynamics, and properties of aerosols; meteorology of air pollution; transport, diffusion, and removal of species in the atmosphere; formation and chemistry of clouds; interaction of atmospheric chemistry and climate; radiative and climatic effects of gases and particles; formulation of mathematical chemical/transport models of the atmosphere. All chapters develop results based on fundamental principles, enabling the reader to build a solid understanding of the science underlying atmospheric processes. Among the new material are three new chapters: Atmospheric radiation and photochemistry, gernal circulation of the atmosphere, and global cycles. In addition, the chapters Stratospheric chemistry, tropospheric chemistry, and organic atmospheric aerosols have been rewritten to reflect the latest findings. Readers familiar with the first edition will discover a text with new structures and new features that greatly aid learning. Many examples are set off in the text to help readers work through the application of concepts. Advanced material has been moved to appendices. Finally, many new problems, coded by degree of difficulty, have been added. A solutions manual is available. Throughly updated and restructured, the second edition of Atmospheric chemistry and physics is an ideal textbook for upper-level undergraduate and graduate students, as well as a reference for researchers in environmental engineering, meteorology, chemistry, and the atmospheric sciences.
    Type of Medium: Monograph available for loan
    Pages: xxviii, 1203 Seiten , Illustrationen
    Edition: Second edition
    ISBN: 9780471720188
    Series Statement: A Wiley-Interscience publication
    Language: English
    Note: CONTENTS: Preface to the Second Edition. - Preface to the First Edition. - 1 The Atmosphere. - 1.1 History and Evolution of the Earth's Atmosphere. - 1.2 Climate. - 1.3 The Layers of the Atmosphere. - 1.4 Pressure in the Atmosphere. - 1.4.1 Units of Pressure. - 1.4.2 Variation of Pressure with Height in the Atmosphere. - 1.5 Temperature in the Atmosphere. - 1.6 Expressing the Amount of a Substance in the Atmosphere. - 1.7 Spatial and Temporal Scales of Atmospheric Processes. - Problems. - References. - 2 Atmospheric Trace Constituents. - 2.1 Atmospheric Lifetime. - 2.2 Sulfur-Containing Compounds. - 2.2.1 Dimethyl Sulfide (CH3SCH3). - 2.2.2 Carbonyl Sulfide (OCS). - 2.2.3 Sulfur Dioxide (SO2). - 2.3 Nitrogen-Containing Compounds. - 2.3.1 Nitrous Oxide (N2O). - 2.3.2 Nitrogen Oxides (NO* = NO + NO2). - 2.3.3 Reactive Odd Nitrogen (NOy). - 2.3.4 Ammonia (NH3). - 2.4 Carbon-Containing Compounds. - 2.4.1 Classification of Hydrocarbons. - 2.4.2 Methane. - 2.4.3 Volatile Organic Compounds. - 2.4.4 Biogenic Hydrocarbons. - 2.4.5 Carbon Monoxide. - 2.4.6 Carbon Dioxide. - 2.5 Halogen-Containing Compounds. - 2.5.1 Methyl Chloride (CH3C1). - 2.5.2 Methyl Bromide (CH3Br). - 2.6 Atmospheric Ozone. - 2.7 Particulate Matter (Aerosols). - 2.7.1 Stratospheric Aerosol. - 2.7.2 Chemical Components of Tropospheric Aerosol. - 2.7.3 Cloud Condensation Nuclei (CCN). - 2.7.4 Sizes of Atmospheric Particles. - 2.7.5 Sources of Atmospheric Paniculate. - 2.7.6 Carbonaceous Particles. - 2.7.7 Mineral Dust. - 2.8 Emission Inventories. - 2.9 Biomass Burning. - Appendix 2.1 Air Pollution Legislation. - Appendix 2.2 Hazardous Air Pollutants (Air Toxics). - Problems. - References. - 3 Chemical Kinetics. - 3.1 Order of Reaction. - 3.2 Theories of Chemical Kinetics. - 3.2.1 Collision Theory. - 3.2.2 Transition State Theory. - 3.2.3 Potential Energy Surface for a Bimolecular Reaction. - 3.3 The Pseudo-Steady-State Approximation. - 3.4 Reactions of Excited Species. - 3.5 Termolecular Reactions. - 3.6 Chemical Families. - 3.7 Gas-Surface Reactions. - Appendix 3 Free Radicals. - Problems. - References. - 4 Atmospheric Radiation and Photochemistry. - 4.1 Radiation. - 4.1.1 Solar and Terrestrial Radiation. - 4.1.2 Energy Balance for Earth and Atmosphere. - 4.1.3 Solar Variability. - 4.2 Radiative Flux in the Atmosphere. - 4.3 Beer-Lambert Law and Optical Depth. - 4.4 Actinic Flux. - 4.5 Atmospheric Photochemistry. - 4.6 Absorption of Radiation by Atmospheric Gases. - 4.7 Absorption by O2 and O3 122. - 4.8 Photolysis Rate as a Function of Altitude. - 4.9 Photodissociation of O3 to Produce O and O(1D). - 4.10 Photodissociation of NO2. - Problems. - References. - 5 Chemistry of the Stratosphere. - 5.1 Overview of Stratospheric Chemistry. - 5.2 Chapman Mechanism. - 5.3 Nitrogen Oxide Cycles. - 5.3.1 Stratospheric Source of NO* from N2O. - 5.3.2 NO* Cycles. - 5.4 HO* Cycles. - 5.5 Halogen Cycles. - 5.5.1 Chlorine Cycles. - 5.5.2 Bromine Cycles. - 5.6 Reservoir Species and Coupling of the Cycles. - 5.7 Ozone Hole. - 5.7.1 Polar Stratospheric Clouds. - 5.7.2 PSCs and the Ozone Hole. - 5.7.3 Arctic Ozone Hole. - 5.8 Heterogeneous (Nonpolar) Stratospheric Chemistry. - 5.8.1 The Stratospheric Aerosol Layer. - 5.8.2 Heterogeneous Hydrolysis of N2O5. - 5.8.3 Effect of Volcanoes on Stratospheric Ozone. - 5.9 Summary of Stratospheric Ozone Depletion. - 5.10 Transport and Mixing in the Stratosphere. - 5.11 Ozone Depletion Potential. - Problems. - References. - 6 Chemistry of the Troposphere. - 6.1 Production of Hydroxyl Radicals in the Troposphere. - 6.2 Basic Photochemical Cycle of NO2, NO, and O3. - 6.3 Atmospheric Chemistry of Carbon Monoxide. - 6.3.1 Low NO* Limit. - 6.3.2 High NO* Limit. - 6.3.3 Ozone Production Efficiency. - 6.3.4 Theoretical Maximum Yield of Ozone from CO Oxidation. - 6.4 Atmospheric Chemistry of Methane. - 6.5 The NO* and NOy, Families. - 6.5.1 Daytime Behavior. - 6.5.2 Nighttime Behavior. - 6.6 Ozone Budget of the Troposphere and Role of NO*. - 6.6.1 Ozone Budget of the Troposphere. - 6.6.2 Role of NO*. - 6.7 Tropospheric Reservoir Molecules. - 6.7.1 H2O2, CH3OOH, and HONO. - 6.7.2 Peroxyacyl Nitrates (PANs). - 6.8 Relative Roles of VOC and NOx in Ozone Formation. - 6.8.1 Importance of the VOC/NOx Ratio. - 6.8.2 Ozone Isopleth Plot. - 6.9 Simplified Organic/NOx Chemistry. - 6.10 Chemistry of Nonmethane Organic Compounds in the Troposphere. - 6.10.1 Alkanes. - 6.10.2 Alkenes. - 6.10.3 Aromatics. - 6.10.4 Aldehydes. - 6.10.5 Ketones. - 6.10.6 α, β-Unsaturated Carbonyls. - 6.10.7 Ethers. - 6.10.8 Alcohols. - 6.11 Atmospheric Chemistry of Biogenic Hydrocarbons. - 6.12 Atmospheric Chemistry of Reduced Nitrogen Compounds. - 6.12.1 Amines. - 6.12.2 Nitriles. - 6.12.3 Nitrites. - 6.13 Atmospheric Chemistry (Gas Phase) of Sulfur Compounds. - 6.13.1 Sulfur Oxides. - 6.13.2 Reduced Sulfur Compounds (Dimethyl Sulfide). - 6.14 Tropospheric Chemistry of Halogen Compounds. - 6.14.1 Chemical Cycles of Halogen Species. - 6.14.2 Tropospheric Chemistry of CFC Replacements: Hydrofluorocarbons (HFCs) and Hydrochlorofluorocarbons (HCFCs). - Problems. - References. - 7 Chemistry of the Atmospheric Aqueous Phase. - 7.1 Liquid Water in the Atmosphere. - 7.2 Absorption Equilibria and Henry's Law. - 7.3 Aqueous-Phase Chemical Equilibria. - 7.3.1 Water. - 7.3.2 Carbon Dioxide-Water Equilibrium. - 7.3.3 Sulfur Dioxide-Water Equilibrium. - 7.3.4 Ammonia-Water Equilibrium. - 7.3.5 Nitric Acid-Water Equilibrium. - 7.3.6 Equilibria of Other Important Atmospheric Gases. - 7.4 Aqueous-Phase Reaction Rates. - 7.5 S(IV)-S(VI) Transformation and Sulfur Chemistry. - 7.5.1 Oxidation of S(IV) by Dissolved O3. - 7.5.2 Oxidation of S(IV) by Hydrogen Peroxide. - 7.5.3 Oxidation of S(IV) by Organic Peroxides. - 7.5.4 Uncatalyzed Oxidation of S(IV) by O2. - 7.5.5 Oxidation of S(IV) by O2 Catalyzed by Iron and Manganese. - 7.5.6 Comparison of Aqueous-Phase S(IV) Oxidation Paths. - 7.6 Dynamic Behavior of Solutions with Aqueous-Phase Chemical Reactions. - 7.6.1 Closed System. - 7.6.2 Calculation of Concentration Changes in a Droplet with Aqueous-Phase Reactions. - Appendix 7.1 Thermodynamic and Kinetic Data. - Appendix 7.2 Additional Aqueous-Phase Sulfur Chemistry. - 7.A.1 S(IV) Oxidation by the OH Radical. - 7.A.2 Oxidation of S(IV) by Oxides of Nitrogen. - 7.A.3 Reaction of Dissolved SO2 with HCHO. - Appendix 7.3 Aqueous-Phase Nitrite and Nitrate Chemistry. - 7.A.4 NOx Oxidation. - 7.A.5 Nitrogen Radicals. - Appendix 7.4 Aqueous-Phase Organic Chemistry. - Appendix 7.5 Oxygen and Hydrogen Chemistry. - Problems. - References. - 8 Properties of the Atmospheric Aerosol. - 8.1 The Size Distribution Function. - 8.1.1 The Number Distribution nN(Dp). - 8.1.2 The Surface Area, Volume, and Mass Distributions. - 8.1.3 Distributions Based on In Dp and log Dp. - 8.1.4 Relating Size Distributions Based on Different Independent Variables. - 8.1.5 Properties of Size Distributions. - 8.1.6 The Lognormal Distribution. - 8.1.7 Plotting the Lognormal Distribution. - 8.1.8 Properties of the Lognormal Distribution. - 8.2 Ambient Aerosol Size Distributions. - 8.2.1 Urban Aerosols. - 8.2.2 Marine Aerosols. - 8.2.3 Rural Continental Aerosols. - 8.2.4 Remote Continental Aerosols. - 8.2.5 Free Tropospheric Aerosols. - 8.2.6 Polar Aerosols. - 8.2.7 Desert Aerosols. - 8.3 Aerosol Chemical Composition. - 8.4 Spatial and Temporal Variation. - 8.5 Vertical Variation. - Problems. - References. - 9 Dynamics of Single Aerosol Particles. - 9.1 Continuum and Noncontinuum Dynamics: The Mean Free Path. - 9.2 The Drag on a Single Particle: Stokes' Law. - 9.2.1 Corrections to Stokes' Law: The Drag Coefficient. - 9.2.2 Stokes' Law and Noncontinuum Effects: Slip Correction Factor. - 9.3 Gravitational Settling of an Aerosol Particle. - 9.4 Motion of an Aerosol Particle in an External Force Field. - 9.5 Brownian Motion of Aerosol Particles. - 9.5.1 Particle Diffusion. - 9.5.2 Aerosol Mobility and Drift Velocity. - 9.5.3 Mean Free Path of an Aerosol Particle. - 9.6 Aer
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