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  • 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis  (15)
  • INGV  (12)
  • Wiley  (3)
  • Periodicals Archive Online (PAO)
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  • 1
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    Caratteristiche del Rumore Sismico nei pressi del Rilevatore di Onde Gravitazionali VIRGO (Cascina, Pisa) (2012)
    INGV
    Details
    Publication Date: 2021-05-12
    Description: In questo lavoro si presentano i risultati di uno studio sulle caratteristiche del rumore sismico in prossimità del rilevatore di onde gravitazionali VIRGO (Cascina, Pisa), con particolare riferimento alle vibrazioni associate all’azione di un vicino parco eolico. La valutazione delle componenti spettrali del rumore verosimilmente indotte dagli aerogeneratori è stata effettuata mediante (i) Misure dirette alla base di una turbina, (ii) Correlazione fra le ampiezze spettrali del rumore e la velocità del vento; (iii) Determinazione delle proprietà direzionali da misure multicanale, (iv) Misura dell’attenuazione del segnale con la distanza dal parco eolico. Il disturbo provocato dagli aerogeneratori è particolarmente energetico alla frequenza di 1.7 Hz e, in particolari condizioni, è stato osservato fino a distanze di 11 km dal Parco Eolico. Il decadimento spaziale delle ampiezze ha un andamento complesso, che può essere interpretato in termini di una combinazione fra onde superficiali e onde di volume rifratte ad un’interfaccia profonda (~800 m) fra i sedimenti plio-pleistocenici ed i calcari Miocenici. La risposta locale nei dintorni dell’interferometro è stata investigata utilizzando la tecnica dei rapporti spettrali H/V. Si sono così evidenziate due bande di amplificazione imputabili ad effetti di risonanza legati alla geologia a scala locale: il primo intorno alla frequenza di 0.35 Hz, il secondo fra 0.7 e 2.0 Hz. Entrambi i picchi risultano essere essenzialmente omogenei in tutta l’area di studio, a conferma della sostanziale uniformità della struttura geologica.
    Description: Published
    Description: 1-30
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: N/A or not JCR
    Description: open
    Keywords: Seismic Noise ; Array Seismology ; Gravity Waves ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 2
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    Rupture history of the 1997 Umbria-Marche (Central Italy) main shocks from the inversion of GPS, DInSAR and near field strong motion data (2006)
    INGV
    Details
    Publication Date: 2021-01-05
    Description: We investigate the rupture history of the three largest magnitude earthquakes of the 1997 Umbria-Marche sequence by inverting GPS, DInSAR and near-source strong motion waveforms. We use the frequency domain inversion procedure proposed by Cotton and Campillo (1995) and calculate the Green s functions for a layered halfspace using the discrete wavenumber and reflectivity methods. We first invert GPS measurements and DInSAR interferograms to image the coseismic slip distribution on the fault planes in a layered half space for the two earthquakes that occurred on September 26, 1997 at 00:33 UTC (Mw = 5.7) and 09:40 UTC (Mw = 6.0) near Colfiorito. We also invert DInSAR interferograms to infer the slip distribution during the subsequent earthquake that occurred on October 14, 1997 at 15:23 UTC (Mw = 5.6) in the SE section of the seismogenic zone near Sellano. We also explore the set of acceptable solutions using a genetic algorithm to have information on the available resolution of geodetic data. The slip models obtained by geodetic data inversion are used to perform a forward modeling of strong motion waveforms for all three events. We adopt a constant rupture velocity of 2.6 km/s and a constant rise time of 1 s. Our results show that these rupture models provide an acceptable fit to recorded waveforms. Finally, we invert the recorded ground displacements, collected during the September 26th 09:40 main shock and the October 14th Sellano earthquake, to constrain the rupture history. We use the geodetic slip distribution as starting model for the iterative inversion procedure. The retrieved rupture models are consistent with those inferred from geodetic data and yield a good fit to recorded seismograms. These rupture models are characterized by a heterogeneous slip distribution and an evident rupture directivity in agreement with previous observations.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: slip history ; waveform inversion ; geodetic data modeling ; Colfiorito earthquakes ; kinematic source models ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques ; 05. General::05.01. Computational geophysics::05.01.03. Inverse methods ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 3
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    Time reverse location of seismic long-period events recorded on Mt Etna (2012)
    Wiley
    Details
    Publication Date: 2017-04-04
    Description: We present the first application of a time reverse location method in a volcanic setting, for a family of long-period (LP) events recorded on Mt Etna. Results are compared with locations determined using a full moment tensor grid search inversion and cross-correlation method. From 2008 June 18 to July 3, 50 broad-band seismic stations were deployed on Mt Etna, Italy, in close proximity to the summit. Two families of LP events were detected with dominant spectral peaks around 0.9 Hz. The large number of stations close to the summit allowed us to locate all events in both families using a time reversal location method. The method involves taking the seismic signal, reversing it in time, and using it as a seismic source in a numerical seismic wave simulator where the reversed signals propagate through the numerical model, interfere constructively and destructively, and focus on the original source location. The source location is the computational cell with the largest displacement magnitude at the time of maximum energy current density inside the grid. Before we located the two LP families we first applied the method to two synthetic data sets and found a good fit between the time reverse location and true synthetic location for a known velocity model. The time reverse location results of the two families show a shallow seismic region close to the summit in agreement with the locations using a moment tensor full waveform inversion method and a cross-correlation location method.
    Description: Published
    Description: 452-462
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: JCR Journal
    Description: reserved
    Keywords: Volcano seismology ; Computational seismology ; Wave propagation ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 4
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    Bollettino Sismico Italiano 2009 (2012)
    INGV
    Details
    Publication Date: 2017-04-04
    Description: Questo lavoro illustra lo stato della Rete Sismica Nazionale Italiana e descrive la sismicità italiana nell’anno 2009. Vengono evidenziate le principali sequenze sismiche occorse durante l’anno, con particolare riguardo alla sequenza sismica dell’aquilano-reatino. Nel 2009 la Rete Sismica Nazionale dell’INGV ha registrato circa 26000 terremoti avvenuti sul territorio nazionale e nelle aree limitrofe, che sono stati analizzati e localizzati dal gruppo di analisti sismologi che si occupano della redazione del Bollettino Sismico Italiano (BSI). La magnitudo minima di completezza Mc del BSI 2009, ovvero la soglia di magnitudo minima media calcolata su tutto il territorio nazionale, è risultata pari a ML 1.6 (il dato del BSI 2008 si attestava sul valore di ML 2.1). Il numero di stazioni sismiche attive (Rete Nazionale e reti locali) nel corso del 2009 è stato di 305 (279 nel 2008). Viene fornita infine una stima del numero e della magnitudo di eventi di origine antropica (esplosioni) presenti nel BSI 2009. This paper describes the status of the Italian National Seismic Network and the Italian seismicity in year 2009. We outline the main seismic sequences that occurred during the year, with particular emphasis on the L’Aquila-Rieti seismic period. The INGV National Seismic Network recorded about 26000 earthquakes in Italy and neighboring areas during 2009, which were analyzed and localized by the seismology group of analysts involved in the publication of the Italian Seismic Bulletin (BSI). The minimum magnitude of completeness Mc of the BSI 2009 is ML 1.6 (ML 2.1 in the BSI 2008). The number of active seismic stations during 2009 was 305 (279 in 2008). We provide an estimate of the number and magnitude of anthropic events (quarry-blasts) included in the BSI 2009.
    Description: Published
    Description: 1-52
    Description: 5.2. TTC - Banche dati di sismologia strumentale
    Description: N/A or not JCR
    Description: open
    Keywords: earthquake ; terremoto ; waves ; esplosion ; sequences ; l'aquila ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 5
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    Seismic rotation waves: basic elements of theory and recording (2006)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: Returning to the old problem of observed rotation effects, we present the recording system and basic elements of the theory related to the rotation fi eld and its association with seismic waves. There can be many different causes leading to observed/recorded rotation effects; we can group them as follows: generation of micro-displacement motion due to asymmetry of source processes and/or due to interaction between seismic body/surface waves and medium structure; interaction between incident seismic waves and objects situated on the ground surface. New recording techniques and advanced theory of deformation in media with defects and internal (e.g., granular) structure make it possible to focus our attention on the fi rst group, related to microdisplacement motion recording, which includes both rotation and twist motions. Surface rotations and twists caused directly by the action of emerging seismic waves on some objects situated on the ground surface are considered here only in the historical aspects of the problem. We present some examples of experimental results related to recording of rotation and twist components at the Ojcow Observatory, Poland, and L'Aquila Observatory, Italy, and we discuss some prospects for further research.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: rotation seismograph ; asymmetric stresses ; defect density ; self-rotation nuclei ; rotation and twist motions ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 6
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    La sismicità del Montefeltro (Appennino settentrionale, Italia centrale) nel periodo 2005-2017 (2019)
    INGV
    Details
    Publication Date: 2019-12-16
    Description: In questo articolo viene esaminata la sismicità del Montefeltro, una regione storica dell’Appennino settentrionale, nell’Italia centrale. L’analisi si concentra sull’attività sismica avvenuta nel periodo 20052017, periodo durante il quale la Rete Sismica Nazionale (RSN) ha avuto nella regione un sostanziale miglioramento. Il data set selezionato consiste di 402 eventi per un totale di circa 7000 tempi di arrivo di fasi P e S. Gli eventi sono stati integrati con nuove letture e rilocalizzati con il programma Hypoellipse. I risultati mostrano una sismicità di fondo sporadica, sebbene piuttosto diffusa nell’area, contrassegnata da tre piccole sequenze fortemente clusterizzate nel tempo e nello spazio. Le più importanti sono avvenute nel settembreottobre 2005 (magnitudo massima ML=3.2) e nell’agostosettembre 2006 (magnitudo massima ML=3.7), rispettivamente nei dintorni dei comuni di Macerata Feltria e Casteldelci. L’evoluzione spaziotemporale di questi due episodi evidenzia un rilascio di energia tipico degli sciami sismici. Un’altra peculiare caratteristica del pattern di sismicità è rappresentata dall’occorrenza di eventi anche nella crosta inferiore e nel mantello superiore fino a profondità di almeno 50 km.
    Description: Published
    Description: 1-26
    Description: 4IT. Banche dati
    Description: JCR Journal
    Keywords: Montefeltro ; Appennino settentrionale ; Analisi delle sequenze ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 7
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    Depth-dependent intrinsic and scattering seismic attenuation in north central Italy (2011)
    Wiley
    Details
    Publication Date: 2017-04-04
    Description: In this study the attenuation mechanism of seismic wave energy in north central Italy is estimated using low-magnitude earthquake local data recorded at six stations managed by INGV. Most of the analysed events are located along the Alpine chain in the zone of Iseo and Garda lakes, while a minor part in the Po valley. The zone investigated is characterized by the occurrence of significantly intense earthquakes (magnitude up to 6.6) the most recent occurred in 2004 close to the city of Sal`o on the coast of the Garda lake (Mw = 5.0). Due to the high population density and presence of industrial activity the investigated area is characterized by a high seismic risk. First, the ordinary Multiple Lapse Time Window Analysis (MLTWA) method is applied in the assumption of uniformvelocity and scattering and the couple of B0, the seismic albedo and Le−1, the extinction length inverse (corresponding to the total attenuation coefficient) is calculated in the frequency bands of 1.5, 3, 6 and 12 Hz. To retrieve more realistic estimates, the obtained values of B0 and Le−1 are corrected taking into account the effects of a depth-dependent earth model, consisting of an earth structure characterized by a transparent upper mantle and a heterogeneous crust. We find that the corrected intrinsic and scattering attenuation parameters (which are proportional to the inverse of the intrinsic/scattering quality factors, QI−1 and Qs−1) are strongly frequency dependent, with a prevalence of scattering attenuation over the intrinsic dissipation. The corrected and uncorrected values of total Q are in agreement with the total Q values obtained with different approaches for the same area.
    Description: Published
    Description: 3.1. Fisica dei terremoti
    Description: JCR Journal
    Description: reserved
    Keywords: Seismic Attenuation ; Coda Waves ; Wave Scattering and Diffraction ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 8
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    Bollettino Sismico Italiano 2010 (2013)
    INGV
    Details
    Publication Date: 2017-04-04
    Description: This paper describes the status of the Italian National Seismic Network and the main feautures of the Italian seismicity in 2010. In that year the network counted 313 velocimeters and 107 accelerometers. More than 14500 earthquakes were located in Italy and surrounding areas and seas, with an average minimum magnitude of completeness MC = 1.6. Most of that seismicity appears in cluster (a spatio-temporal concentration of seismic events): in 2010 more than 70% of the located Italian earthquakes belongs to about 430 cluster. We selected all the cluster with at least 20 events of any magnitudes, and all the cluster with at least 10 events and at least one event of magnitude 2.5 or greater, and cluster with at least two events and one of magnitude 3.5 or greater, ending up with a list of 48 significant cluster. The Italian Seismic Bulletin contains also seismic events originated by anthropic activities (quarry explosions). Through the analysis of the last 7 years of data from the bulletin, we pinpointed 16 areas with extended extractive activities. Nevertheless the presence of quarries in Italy is so widespread that our list can be considered by no means complete. Extraction areas frequently coincide with regions affected by high seismicity rate. Records due to explosion quakes can show distinguishing characteristics (compressive first onset and a low frequency secondary phase). However, these markers are not present in all the artificial events, and are not sufficient to exclude the totality of the explosions from the bulletin. Nowadays the BSI incorporates, together with true tectonic earthquakes, a significant portion of low magnitude events due to explosions, evaluated about 5% in 2010.
    Description: Published
    Description: 1-52
    Description: 5.2. TTC - Banche dati di sismologia strumentale
    Description: N/A or not JCR
    Description: open
    Keywords: earthquake ; terremoto ; waves ; esplosion ; sequences ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 9
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    Caratterizzazione del noise sismico nell'area vulcanica dei Campi Flegrei: l'esperimento "UNREST" (2010)
    INGV
    Details
    Publication Date: 2017-04-04
    Description: A seismic noise recording experiment has been carried out in the Campi Flegrei volcanic area from March 9 to 26, 2009 in the framework of the INGV-DPC 2007-2009 agreement (Project V1 – UNREST). The project aimed at the realization of an integrated method for the definition of the unrest phases at Campi Flegrei. 21 digital three-component seismic stations equipped with broad band seismometers have been added to the existing 11 digital stations already deployed in the area. The preliminary results show a correlation between the seismic noise level and the anthropic activity, whereas the meteorological conditions seem affecting the low frequency seismic noise. These results are important to define the detection thresholds of the seismic signals generated during a possible renewal phase of the volcanic activity.
    Description: Published
    Description: 1-21
    Description: N/A or not JCR
    Description: open
    Keywords: Campi Flegrei ; seismic noise ; spectral analysis ; wave polarization ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis ; 04. Solid Earth::04.06. Seismology::04.06.10. Instruments and techniques ; 04. Solid Earth::04.06. Seismology::04.06.11. Seismic risk
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 10
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    Source characteristics of a moderate earthquake (M 4.9)using empirical Green s function technique (2006)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: The rupture process of a moderate earthquake (M 4.9)on 28th January 1999 was analyzed using velocity records at local distances less than 80 km.The characterization of the rupture process was obtained from studying aftershocks distribution,azimuthal variations of Relative Source Time Functions (RSTFs),and a set of spatio-temporal slip models.RSTFs were retrieved by deconvolution of small aftershock records from those of the mainshock.In addition,velocity P -wave records of the respective event were inverted to recover slip distribution on the fault plane using the records of aftershocks as Empirical Green Functions (EGFs).The waveform inversion was adopted using three EGFs.In the inversion,the rupture propagation velocity was fixed and assumed to be eight-tenths of the local shear wave velocity.The total seismic moment was estimated to range from 0.011 E +18 Nm (Mw =4.6) to 0.017 E +18 Nm (Mw =4.8).The hypocentral distribution of the aftershocks,azimuthal variations of RSTFs, and the set of slip distribution models were exhibited bilateral rupture propagation along the strike and dip of the fault plane.The presence of two to three high slip patches on the fault plane suggested that a complex rupture pattern is detectable for a moderate size earthquake.However,the so-called nucleation phase was invisible in the present analysis.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: empirical Green's function ; aftershocks distribution ; relative source time function ; spatio-temporal slip models ; 04. Solid Earth::04.06. Seismology::04.06.04. Ground motion ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 11
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    Bollettino Sismico Italiano 2011 (2016)
    INGV
    Details
    Publication Date: 2017-04-04
    Description: Questo lavoro illustra lo stato della Rete Sismica Nazionale Italiana (RSNI) e le principali caratteristiche della sismicità in Italia nell’anno 2011. In tale anno, tramite i dati raccolti dalla RSNI, sono stati localizzati 16499 eventi registrati da 359 stazioni appartenenti sia all’INGV, sia ad altre reti locali e regionali connesse in tempo reale al Centro Nazionale Terremoti (CNT) di Roma. La magnitudo minima di completezza del Bollettino Sismico Italiano (BSI) è ML 1.5. La magnitudo massima è stata registrata per un evento localizzato nella pianura padano veneta (ML 4.8). Nella sismicità italiana del 2011 sono state individuate 46 sequenze sismiche rilevanti; tra esse riveste particolare interesse la sequenza nel Montefeltro: iniziata a fine maggio e durata diversi mesi, essa comprende due eventi di magnitudo ML 4.0. La sequenza del Pollino, iniziata nel 2009 e proseguita a più riprese fino al 25 ottobre 2012 con un evento di magnitudo MW 5.2, presenta a inizio 2011 un aumento della sismicità che è culminato con l’evento maggiore di quell’anno (ML 3.6). L’analisi del BSI ha inoltre permesso di individuare una nuova area caratterizzata da eventi di origine antropica (esplosioni in cava) che si aggiunge alle 16 già rilevate negli anni precedenti. In questo lavoro vengono analizzati anche i segnali prodotti da frane di crollo, molto diffuse nel nostro paese lungo gli archi montani alpini e appenninici.
    Description: Published
    Description: 1-56
    Description: 4IT. Banche dati
    Description: N/A or not JCR
    Description: open
    Keywords: earthquake ; terremoto ; waves ; esplosion ; sequences ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 12
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    Bollettino Sismico Italiano 2012 (2017)
    INGV
    Details
    Publication Date: 2018-03-23
    Description: In questo lavoro viene presentato lo stato della Rete Sismica Nazionale Italiana (RSNI) e viene analizzata la sismicità in Italia nel corso del 2012. In questo anno la RSNI risulta costituita da 413 stazioni sismiche, appartenenti all’INGV e ad altre reti locali e regionali, una parte delle quali fornisce il segnale in tempo reale al Centro Nazionale Terremoti (CNT) di Roma. Il Bollettino Sismico Italiano (BSI) del 2012 è costituito da 18221 terremoti localizzati; una parte rilevante di questa sismicità appartiene alla grande sequenza sismica emiliana che ha colpito principalmente le province di Modena, Ferrara, Reggio Emilia, Bologna, Mantova e Rovigo, causando vittime, centinaia di feriti e danni gravissimi al patrimonio artistico, all’edilizia rurale e industriale, oltre che a quella di uso civile (Fig. 1). Il 20 Maggio alle ore 02:03 UTC un terremoto di ML 5.9 (MW 5.8), preceduto alcune ore prima da uno di ML 4.1, diede inizio alla sequenza sismica. Il 29 Maggio alle ore 07:00 UTC, un altro forte terremoto (ML 5.8, MW 5.6) colpì il settore occidentale dell’area interessata dalla prima parte della sequenza sismica. Nel corso del 2012 la sequenza ha fatto registrare circa 3100 eventi sismici. Nel 2012 sono state individuate altre 27 sequenze sismiche oltre a quella emiliana. Tra di esse riveste particolare importanza quella che ha interessato la zona del Pollino, iniziata già nel 2009, e proseguita per tutto il 2012: l’evento più forte è del 25 ottobre 2012 con magnitudo ML pari a 5.0 (MW 5.2). La magnitudo minima di completezza media del BSI 2012 risulta essere MC 1.4. Il BSI 2012 contiene circa 350 eventi di origine antropica, per la massima parte esplosioni in cava, registrati in aree già note in base all’analisi della sismicità degli anni precedenti e in due nuove aree individuate. Vengono inoltre analizzate le registrazioni prodotte da una frana di crollo, fenomeno erosivo e gravitativo molto diffuso nel nostro paese, specialmente nell’arco alpino.
    Description: Published
    Description: 1-64
    Description: 4IT. Banche dati
    Description: JCR Journal
    Description: open
    Keywords: earthquake ; terremoto ; waves ; sequences ; explosion ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 13
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    Seismic reflection data processing in active volcanic areas: an application to Campi Flegrei and Somma Vesuvius offshore (Southern Italy) (2006)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: The Campanian volcanism develops near the sea. Therefore, the geophysical study of the marine environment is a key to a better understanding of the tectonic evolution and the origin of volcanism in the area. An abundance of high quality seismic data in the marine sector, where little direct information is available, is critical to the study of Campanian volcanism. This paper concerns the reprocessing of a seismic reflection dataset acquired in Naples Bay and processed during 1973. Even though the overall data quality was high for that time, of course their acquisition technological limits have been overcome by the new processing. Our reprocessing aimed at: 1) reduction of random noise in the data; 2) removal of unwanted coherent events; 3) reduction of spatial aliasing by means of trace interpolation on Commod Shot Point (CSP) gathering; 4) improvement of resolution of the seismic wavelet with spiking deconvolution algorithms and finally 5) reposition of reflectors in their correct locations in the space-TWT domain by means of dip moveout and post-stack time migration. A comparison between the new and old data shows that the new sections are characterized by a much higher S/N ratio. Diffraction hyperbole has been collapsed. Reverberations, ghosts and multiples have been removed or greatly attenuated, especially between the reflectors of interest, allowing us to follow them with more detail and with greater continuity. Furthermore, data resolution has been boosted by the reprocessing, allowing the interpreter to evaluate reflector position and continuity in greater detail. The reinterpretation phase of such lines, that is already in an advanced stage, will therefore allow us to gain new insights into the structural setting of the bay, with the aim of exploring the connection between tectonics and volcanism.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: marine geophysics ; seismic reflection ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
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  • 14
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    Time reverse location of seismic long-period events recorded on Mt Etna (2011)
    Wiley
    Details
    Publication Date: 2017-04-04
    Description: We present the first application of a time reverse location method in a volcanic setting, for a family of long-period (LP) events recorded on Mt Etna. Results are compared with locations determined using a full moment tensor grid search inversion and cross-correlation method. From 2008 June 18 to July 3, 50 broad-band seismic stations were deployed on Mt Etna, Italy, in close proximity to the summit. Two families of LP events were detected with dominant spectral peaks around 0.9 Hz. The large number of stations close to the summit allowed us to locate all events in both families using a time reversal location method. The method involves taking the seismic signal, reversing it in time, and using it as a seismic source in a numerical seismic wave simulator where the reversed signals propagate through the numerical model, interfere constructively and destructively, and focus on the original source location. The source location is the computational cell with the largest displacement magnitude at the time of maximum energy current density inside the grid. Before we located the two LP families we first applied the method to two synthetic data sets and found a good fit between the time reverse location and true synthetic location for a known velocity model. The time reverse location results of the two families show a shallow seismic region close to the summit in agreement with the locations using a moment tensor full waveform inversion method and a cross-correlation location method.
    Description: In press
    Description: (11)
    Description: 1.4. TTC - Sorveglianza sismologica delle aree vulcaniche attive
    Description: JCR Journal
    Description: reserved
    Keywords: Volcano seismology ; Computational seismology ; Wave propagation ; 04. Solid Earth::04.06. Seismology::04.06.08. Volcano seismology ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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    On the excitation of magnetic signals by Love waves (2006)
    INGV
    Details
    Publication Date: 2019-11-04
    Description: The polarization method for recognition of seismomagnetic waves against a noise background is presented. The method is applied to detection of magnetic oscillations accompanying the propagation of surface Love wave after a strong earthquake. A specific property of the Love waves is that theoretically the Tolman-Stewart effect is alone responsible for the magnetic field that penetrates into the Earth's surface. Data from the Mondy Magnetic Observatory and the Talaya Seismic Station suggest that the arrival time, duration, period,and polarization of magnetic signals conform with the idea of generation of alternating electric currents due to fluid vibrations in pores and fractures of rocks under the action of the inertial force associated with the Love wave propagation.
    Description: Published
    Description: JCR Journal
    Description: open
    Keywords: Earth crust ; Tolman-Stewart effect ; 04. Solid Earth::04.06. Seismology::04.06.09. Waves and wave analysis
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 555996 bytes
    Format: application/pdf
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