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  • 1
    Publication Date: 2015-09-11
    Print ISSN: 0895-0695
    Electronic ISSN: 1938-2057
    Topics: Geosciences
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  • 2
    Publication Date: 2019-11-04
    Description: A tomographic experiment was performed in the Italian region using local and regional arrivaI times of p and S seismological phases selected from the Italian National Bulletin in the time interval 1984-1991. We deter- mined a 3-D crustal P-wave velocity model using a simultaneous inversion method that iteratively re1ocates the hypocenters and computes the unknown model parameters. A fast two-point ray tracing algorithm was adopted to compute the ray paths and travel times of P", S", P g' Sg phases with good accuracy. Synthetic tests were performed using the "true" hypocenter and station distribution to rough1y evaluate the extension of the areas most densely spanned by the ray paths; the agreement between synthetic and computed models is more satisfactory at Moho depths than in the upper crust. The qua1ity of the model resulting from inversion of real data is examined by the ca1culation of the Spread Function (Toomey and Foulger, 1989). The 3-D crustal P-wave velocity mode1 of the Italian region shows remarkab1e trends at Moho depths: the areas east of the Apennines call for positive adjustments of the initial velocity va1ue, while the west region shows negative ad- justments. The correspondence among the main features of the velocity field, the map of Moho isobaths and the map of the gravity anoma1ies is also outlined.
    Description: JCR Journal
    Description: open
    Keywords: inversion algorithms ; seismic tomography ; Moho structure ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy ; 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: 6703271 bytes
    Format: application/pdf
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  • 3
    Publication Date: 2017-04-04
    Description: Nell’ambito delle commemorazioni per i 50 anni dalla frana del Vajont, il Dipartimento della Protezione Civile (DPC), la Regione Veneto e la Regione Autonoma Friuli Venezia Giulia con il coinvolgimento delle Province Autonome di Trento e Bolzano, hanno organizzato un’esercitazione sul rischio sismico denominata “Nord-Est 2013” svoltasi dal 13 al 15 settembre 2013. Obiettivo primario dell’iniziativa era verificare la capacità di risposta in situazioni di emergenza di tutte le componenti e le strutture operative della Protezione Civile, a livello centrale e periferico, e della rete di collaborazioni ad essa collegate. L’esercitazione prevedeva la simulazione di un terremoto di magnitudo Richter (ML) 5.8 alle ore 7.30 locali con epicentro nel Comune di Tambre, in Provincia di Belluno, i cui effetti, in termini di popolazione coinvolta in crolli, avrebbero interessato anche le Province di Treviso e Pordenone. Come terremoto di riferimento per l’iniziativa, è stato scelto l’evento sismico di Bosco Cansiglio avvenuto il 18 ottobre 1936 alle 3:10 UTC (MW 5.8) (Figura 1 [Barbano et al., 1986]). L’emergenza simulata era, ai fini dell’attività di protezione civile1, di tipo C ovvero di rilievo nazionale (il tipo A si riferisce alle emergenze locali, gestibili su scala comunale; quelle di tipo B alle emergenze che richiedono una risposta e risorse su scala provinciale o regionale). L’Istituto Nazionale di Geofisica e Vulcanologia (INGV) ha partecipato attivamente all’esercitazione “Nord-Est 2013” nella giornata di sabato 14 settembre (dalle 7.30 alle 17.30, ora locale), attivando le procedure che sono disposte in caso di evento sismico come previsto dall’Allegato A2 dell’Accordo Quadro 2012-2021 della Convenzione esistente fra l’INGV e il Dipartimento della Protezione Civile (DPC). Nel presente report sono descritte brevemente le azioni approntate dall’INGV sia nella fase di pianificazione che durante l’esercitazione stessa; sebbene il risultato conseguito si possa ritenere più che positivo, in questo lavoro si vogliono mettere in evidenza alcune criticità osservate per le quali sarà opportuno trovare delle soluzioni da adottare nella prossima emergenza.
    Description: Published
    Description: 1-88
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: N/A or not JCR
    Description: open
    Keywords: Exercise of civil protection ; Seismic monitoring ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 4
    Publication Date: 2017-04-04
    Description: N/A
    Description: Published
    Description: 159-162
    Description: 5T. Sorveglianza sismica e operatività post-terremoto
    Description: N/A or not JCR
    Description: restricted
    Keywords: centro allerta tsunami ; tsunami warning system ; Mediterraneo ; Mediterranean Sea ; 05. General::05.09. Miscellaneous::05.09.99. General or miscellaneous
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 5
    Publication Date: 2017-04-04
    Description: Some of the most significant advances in seismology have resulted from analysis performed on the seismic parameters reported in the Bulletins and disseminated by the seismological data centers. A large fraction of works on travel time residuals and tomography has relied upon arrival times published by the bulletins. A precise estimate of the onset time of seismic phases is needed to obtain accurate event locations necessary for seismological studies of spatial patterns of earthquake hypocenters. To obtain very precise onset times for all seismic signals, seismological data center mostly rely on the picks provided by their human analysts. However, the increase in the number of analysts and the quality of arrivals reported in bulletins has also been debated. We present the results of an analysis aimed to estimate the quality of phase arrivals. A comparison between the arrival times reported in the Istituto Nazionale di Geofisica (ING) bulletins and those retimed in an effort to obtain accurate pickings for a tomographic study is also presented.
    Description: Published
    Description: Birmingham, United Kingdom 19-30 July 1999
    Description: 4IT. Banche dati
    Description: open
    Keywords: Istituto Nazionale di Geofisica bulletins ; seismological data center ; 05. General::05.02. Data dissemination::05.02.02. Seismological data
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Abstract
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  • 6
    Publication Date: 2017-04-04
    Description: Even though the most reliable and physically consistent defi- nition of the size of an earthquake is the moment magnitude Mw, small earthquakes located in Italy and in other regions of the world are traditionally calculated using local magnitude ML. Because such magnitude was calibrated using a set of southern California earthquakes, a specific recalibration is required in regions with different attenuation properties. We determine the amplitude attenuation function for Italy using various datasets and different functional forms. We also esti- mate separate attenuation equations for a subdivision of the Italian area in two regions with different crustal properties.
    Description: Italian Presidenza del Consiglio dei Ministri–Dipartimento della Protezione Civile (DPC)
    Description: Published
    Description: 1383-1392
    Description: 3T. Pericolosità sismica e contributo alla definizione del rischio
    Description: JCR Journal
    Description: restricted
    Keywords: local magnitude, attenuation law ; 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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  • 7
    Publication Date: 2019-11-04
    Description: We present a tomographic view of the crust and uppermost mantle beneath the Central Mediterranean area obtained from P-wave arrival times of regional earthquakes selected from the ISC bulletin. The P-wave velocity anomalies are obtained using Thurber's algorithm that jointly relocates earthquakes and computes velocity adjustments with respect to a starting model. A specific algorithm has been applied to achieve a distribution of epicentres as even as possible. A data set of 1009 events and 49072 Pg and Pn phases was selected. We find a low velocity belt in the crust, evident in the map view at 25 km of depth, beneath the Hellenic arc. A low velocity anomaly extends at 40 km of depth under the Aegean back arc basin. High velocities are present at Moho depth beneath the Ionian sea close to the Calabrian and Aegean arcs. The tomographic images suggest a close relationship between P-wave velocity pattern and the subduction systems of the studied area.
    Description: JCR Journal
    Description: open
    Keywords: travel time inversion ; ray tracing ; subduction ; 04. Solid Earth::04.06. Seismology::04.06.07. Tomography and anisotropy
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
    Format: 3074209 bytes
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