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  • 1
    Electronic Resource
    Electronic Resource
    Regional coda Q variations in the western Alps (northern Italy)
    Amsterdam : Elsevier
    Physics of the Earth and Planetary Interiors 67 (1991), S. 76-86 
    Details
    ISSN: 0031-9201
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Geosciences , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0031-9201(91)90061-L
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    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    The 1997 Umbria-Marche (Italy) earthquake sequence: analysis of the data recorded by the local and temporary networks (2000)
    Springer
    Journal of seismology 4 (2000), S. 401-414 
    Details
    ISSN: 1573-157X
    Keywords: Aftershocks distribution ; Apennines ; earthquake location ; propagation models ; seismic sequences
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences , Physics
    Notes: Abstract We present some preliminary results obtained from thejoined analysis of the data collected by the permanentand the temporary networks operating in the area ofthe earthquake sequence that followed (andanticipated) the 26 September, Central Italy, mainshocks. In particular, these earthquake data haveallowed us to determine a well constrainedwave-velocity model (both P and S) with stationcorrections which demonstrated to produce robusthypocentral locations. These velocity modelswith station corrections have been used forre-locating the whole September 1997–July 1998subset of data of the permanent network, and theprevious background seismicity, starting from May1996. The focal mechanisms of the largest events werealso obtained from an analysis of the first-motionpolarities.Our results indicate that 1) the seismic activityaligns on a SE-NW trend for a total length of about50 km of extension; 2) the focal depth of theseevents is restricted to the range 0–9 km; 3) mostevents can be related to sub-parallel SW dipping faultplanes; 4) focal mechanisms of the largest shocks(ML 〉 4) show a coherent behaviour, withnormal fault solution on SSE-NNW striking, SW dippingplanes; 5) the space-time evolution of the activitydisplays a discontinuous mode of energy release, withdifferent episodes of activation and an apparentclustering of aftershocks at the edges of the areaswhich presumably ruptured in the main shocks.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1026511209166
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A Waveform Similarity Approach to Investigate Seismicity Patterns (1999)
    Springer
    Natural hazards 19 (1999), S. 123-138 
    Details
    ISSN: 1573-0840
    Keywords: cross-correlation ; similarity ; cluster ; earthquake family ; doublet ; multiplet ; western alps
    Source: Springer Online Journal Archives 1860-2000
    Topics: Energy, Environment Protection, Nuclear Power Engineering , Geography , Geosciences
    Notes: Abstract the temporal and spatial evolution of seismicity, a simple cross-correlation technique was applied to a waveform data set of western Alps earthquakes. A selection of events recorded by a reference station of the regional seismic network of North-Western Italy (IGG network) within a particular S-P range was used. The adopted method was tested on 380 events recorded in 1995, allowing for the definition of the critical parameters for an optimal identification of earthquake families. The comparison of the individuated families definition with the relevant epicentres map confirms that, on small scales, the epicentre positions of microearthquakes located by a regional network could be strongly influenced by location errors. The analysis was extended to a more complete data set of 2653 events; 1171 of them were grouped in families. The results demonstrated that our single station method is able to discriminate between closely spaced families on the basis of the position and of the radiation properties.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1023/A:1008099705858
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    Paper (German National Licenses)
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  • 4
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    Teleseisms as Estimators of Experimental Long-Period Site Amplification: Application to the Po Plain (Italy) for the 2011 Mw 9.0 Tohoku-Oki (Japan) Earthquake (2013)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2013-10-01
    Description: This study focuses on the evaluation of teleseisms as estimators of long-period seismic site amplification in correspondence to large alluvial basins. Using the recordings of the 11 March 2011 M w  9.0 Tohoku-Oki, Japan, earthquake, the site response at low frequency of the Po Plain, Italy, was investigated. The interdistances among the analyzed sites, compared to the travel paths of the Tohoku-Oki waveforms with respect to the target area, allowed us to investigate the reliability of the standard spectral ratio (SSR) technique applied to teleseismic recordings. The results are presented as directional SSRs calculated considering 2 min of P , S , and Rayleigh ( LR ) waves, filtered from 0.025 to 1.0 Hz. Considering the horizontal components, at frequency from 0.04 to 0.3 Hz, the Po Plain stations show amplification factors up to 20 and 16, detected for the S and LR phases, respectively. In some cases, the amplified ground motion appeared to be affected by polarization phenomena, in particular in the north–south direction. Moving from the center to the edge of the basin, the LR -wave amplification remarkably decreases, in particular for frequencies between 0.1 and 0.3 Hz; this was not observed for the S wave. Amplification factors 〉10 were also detected for the vertical component, with increasing resonance periods moving from P to LR waves. Comparing SSRs with the single-station horizontal-to-vertical spectral ratios, the latter case shows that the vertical amplifications lead to the partial masking of the actual response of a site, in particular for frequencies 〉0.15 Hz. Finally, the relative P -wave amplitudes were also investigated. The results of the spectral analysis and the correlation between the relative P -wave amplitudes and the geometry of the bedrock suggest that the proposed approach is appropriate for the investigation of long-period seismic site response in similar settings.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 5
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    Moho Reflection Effects in the Po Plain (Northern Italy) Observed from Instrumental and Intensity Data (2011)
    Seismological Society of America (SSA)
    Details
    Publication Date: 2011-10-01
    Description: Recent moderate-sized earthquakes (ML[≤]5.2) that occurred in northern Italy demonstrate that the currently available ground-motion prediction equations (GMPEs) largely underestimate shaking in the Po Plain region at hypocentral distances greater than 70 km. In order to investigate this phenomenon, we collected a set of peak ground acceleration (PGA) observations for weak and moderate earthquakes in the area. Nonparametric regression analysis of PGA observations as a function of magnitude and hypocentral distance shows that PGA is systematically enhanced for distances between 70 and 200 km. An indirect estimation through the analysis of the attenuation of macroseismic intensities suggests that the effect also applies to strong earthquakes (ML〉5.5). We performed numerical modeling experiments to investigate the cause of the phenomenon. The characteristics of the computed synthetic seismograms indicate that the enhancement of ground motion is mainly an effect of the reflection of S waves at the Moho (SmS phase). The analysis of both real and synthetic data shows that the Moho reflection effect is maximized at hypocentral distances between 90 and 150 km, where the PGA increases by a factor larger than 2.4.
    Print ISSN: 0037-1106
    Electronic ISSN: 1943-3573
    Topics: Geosciences , Physics
    Published by Seismological Society of America (SSA)
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  • 6
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    Task 4 - Garda - Deliverables D14-D15: Stima degli effetti di sito (2007)
    Details
    Publication Date: 2021-01-27
    Description: Nell’area del Garda, gli effetti di sito sono stati valutati in modo speditivo, utilizzando le informazioni geologiche e geomorfologiche di superficie insieme a misure di rumore ambientale. Dove possibile, sono stati utilizzati anche dati e informazioni disponibili dagli studi di rischio sismico della Regione Lombardia-CNR (1996). Le misure di rumore sono state effettuate nei quattro comuni prescelti: Vobarno, Salò, Toscolano Maderno e Gardone Riviera. Inoltre è stata condotta una campagna di misure lungo la Val Sabbia, dove sono stati rilevati i maggiori danni. Nel comune di Gardone Riviera è stata selezionata un’area rappresentativa dell’intero versante che va da questo comune fino a Gargnano, caratterizzato da depositi eluviali sovrastanti calcari stratificati. Come area rappresentativa dei conoidi detritici, presenti in vari comuni del lago, deposti lungo il fronte del sovrascorrimento e immergenti nel lago di Garda, è stato selezionato l’abitato di Toscolano Maderno. L’area di Vobarno si trova su depositi alluvionali recenti e terrazzati del fiume Chiese, mentre Salò è ubicatosu depositi morenici di spessore significativo (massimo un centinaio di metri) su cui poggiano depositi alluvioniali recenti. Lo scopo di questo studio è la classificazione dei suoli secondo la normativa italiana (Ordinanza PCM 3274; 2003 e Norme tecniche per le costruzioni; D.M. 14/09/05) attraverso l’utilizzo congiunto delle informazioni geologiche e della frequenza di risonanza dei depositi, calcolata attraverso i rapporti spettrali della componente orizzontale e verticale del rumore ambientale. Inoltre si è verificato se esistesse una correlazione fra dati di intensità risentita durante l’evento del 24 Novembre 2004 e le condizioni di sito, individuate utlizzando informazioni geologiche.
    Description: Progetto INGV-DPC S3 “Scenari di scuotimento in aree di interesse prioritario e/o strategico” (coord. F.Pacor e M.Mucciarelli).
    Description: Published
    Description: 4.1. Metodologie sismologiche per l'ingegneria sismica
    Description: open
    Keywords: site effects ; microtremor analysis ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: report
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  • 7
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    Terremoto in Emilia Romagna: le attività del Pronto Intervento Sismico durante il primo mese di emergenza. Modalità e tempistica (2013)
    Details
    Publication Date: 2021-04-20
    Description: Alle ore 02.03 UTC di domenica 20 maggio 2012, la Rete Sismica Nazionale (RSN [Amato and Mele, 2008; Delladio, 2011]) dell’Istituto Nazionale di Geofisica e Vulcanologia (INGV) ha registrato un evento simico di magnitudo locale 5.9 che è stato avvertito in gran parte dell’Italia centro-settentrionale; l’evento è stato localizzato sotto la valle del Po in Emilia (44.89° N, 11.23° E e 6.3 km di profondità). Subito dopo la scossa principale, è stato attivato il Pronto Intervento Sismico dell’INGV al fine di installare una rete sismica temporanea ad integrazione delle stazioni permanenti già presenti in area epicentrale. Grazie alla collaborazione fra le sedi INGV di Ancona, Arezzo, Bologna, Irpinia (Grottaminarda), Milano, Pisa e Roma sono state installate 44 stazioni temporanee, di cui 10 in trasmissione real-time con la sala di sorveglianza simica della sede di Roma. Contemporaneamente altre 38 stazioni sismiche temporanee sono state inoltre installate dal Dipartimento della Protezione Civile – DPC (16 stazioni strong motion), dall’Istituto Nazionale di Oceanografia e di Geofisica Sperimentale – OGS (8 stazioni stand-alone) e da enti francesi (14 stazioni stand-alone). In una seconda fase, l’8 giugno 2012, è stato attivato anche il Centro Operativo Emergenza Sismica (COES [Moretti et al., 2010a]), all’interno della Direzione di Comando e Controllo (Di.Coma.C.) del DPC predisposto presso l’Agenzia della Protezione Civile Regionale dell’Emilia Romagna (Bologna). L’allestimento e il coordinamento della struttura sono stati realizzati grazie alla collaborazione tra il Centro Nazionale Terremoti (CNT) e la Sezione di Bologna. Il COES ha garantito la comunicazione costante e diretta con i funzionari DPC presenti nell'area epicentrale. Allo stesso tempo, la struttura è stata proposta come supporto logistico per tutti i colleghi dell’INGV impegnati in attività nella zona epicentrale (reti sismiche Mobili, EMERSITO, GPS, EMERGEO, QUEST) e per sostenere il servizio dedicato alla “Comunicazione e Informazione” promosso a favore delle popolazioni colpite, degli operatori della protezione civile e dei volontari di soccorso. In questo lavoro saranno descritte le attività svolte nel primo mese di emergenza, le modalità e le tempistiche dell’intervento, le strutture coinvolte.
    Description: Published
    Description: 1-43
    Description: 1.1. TTC - Monitoraggio sismico del territorio nazionale
    Description: N/A or not JCR
    Description: open
    Keywords: Emilia 2012 sequence ; Seismic networks ; Seismological data ; 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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  • 8
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    The May 20 (M W 6.1) and 29 (M W 6.0), 2012, Emilia (Po Plain, northern Italy) earthquakes: New seismotectonic implications from subsurface geology and high-quality hypocenter location (2015)
    Elsevier Science Limited
    Details
    Publication Date: 2021-03-02
    Description: This study presents new geological and seismological data that are used to assess the seismic hazard of a sector of the Po Plain (northern Italy), a large alluvial basin hit by two strong earthquakes on May 20 (Mw 6.1) and May 29 (Mw 6.0), 2012. The proposed interpretation is based on high-quality relocation of 5,369 earthquakes ( 'Emilia sequence‘) and a dense grid of seismic profiles and exploration wells. The analysed seismicity was recorded by 44 seismic stations, and initially used to calibrate new one-dimensional and three- dimensional local Vp and Vs velocity models for the area. Considering these new models, the initial sparse hypocenters were then relocated in absolute mode and adjusted using the double-difference relative location algorithm. These data define a seismicity that is elongated in the W-NW to E-SE directions. The aftershocks of the May 20 mainshock appear to be distributed on a rupture surface that dips ~45° SSW, and the surface projection indicates an area ~10 km wide and 23 km long. The aftershocks of the May 29 mainshock followed a steep rupture surface that is well constrained within the investigated volume, whereby the surface projection of the blind source indicates an area ~6 km wide and 33 km long. Multichannel seismic profiles highlight the presence of relevant lateral variations in the structural style of the Ferrara folds that developed during the Pliocene and Pleistocene. There is also evidence of a Mesozoic extensional fault system in the Ferrara arc, with faults that in places have been seismically reactivated. These geological and seismological observations suggest that the 2012 Emilia earthquakes were related to ruptures along blind fault surfaces that are not part of the Pliocene-Pleistocene structural system, but are instead related to a deeper system that is itself closely related to re-activation of a Mesozoic extensional fault system.
    Description: Published
    Description: 107–123
    Description: 5T. Sorveglianza sismica e operatività post-terremoto
    Description: JCR Journal
    Description: restricted
    Keywords: velocity model ; relocated hypocenters ; double-difference locations ; Po Plain ; May 2012 Emilia earthquakes ; reactivated extensional faults ; 04. Solid Earth::04.06. Seismology::04.06.01. Earthquake faults: properties and evolution
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: article
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  • 9
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    Un array lineare fra Sansepolcro e Anghiari (Alta Valtiberina): acquisizione dati e prime analisi da terremoti e microtremore (2007)
    Details
    Publication Date: 2017-04-04
    Description: La Valtiberina è da alcuni anni una delle principali aree dell'Appennino Centro-Settentrionale sottoposta ad indagini mirate alla definizione della geometria del bacino e alla descrizione in termini di geometria e meccanismo della faglia AltoTiberina, principale responsabile dell'attività sismica dell'area. Al fine di contribuire con dati sismometrici alla ricostruzione della risposta sismica del bacino, nella seconda metà del 2005 è stato realizzato un esperimento temporaneo consistito nell'installazione di un array lineare di 8 stazioni sismiche fra Sansepolcro e Anghiari. L'array era disposto lungo una direzione NE-SW, approssimativamente ortogonale all'asse della valle per una lunghezza di circa 8 km con una spaziatura fra le stazioni di circa 1 km. Le stazioni sismiche, equipaggiate con sismometri Lennartz LE3D-5s e Guralp CMG40T accoppiati a sistemi di acquisizione Reftek 130 e Reftek 72A/07, hanno acquisito in continua per circa 5 mesi (da Maggio 2005 a Novembre 2005), registrando alcune centinaia di eventi sismici locali, regionali e telesismi.
    Description: Published
    Description: Roma, 28-30 novembre
    Description: open
    Keywords: date ; earthquake ; 04. Solid Earth::04.06. Seismology::04.06.06. Surveys, measurements, and monitoring
    Repository Name: Istituto Nazionale di Geofisica e Vulcanologia (INGV)
    Type: Poster session
    Format: 147214 bytes
    Format: application/pdf
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  • 10
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    Compression along the northern Apenninines? Evidence from the Mw 5.3 Monghidoro earthquake (2007)
    Blackwell
    Details
    Publication Date: 2017-04-04
    Description: In this paper, we present the seismological data recorded during the deployment of a dense three-component seismic network installed a few hours after the 2003 Mw 5.3 Monghidoro earthquake, in northern Apennines. The main shock focal solutions derived from polarities distribution and body wave modelling of regional broadband data show a NE–SW striking reverse mechanism. Accurate relative locations of aftershocks and the inversion of focal mechanisms show that earthquakes occurred on a NW-dipping backthrust within the Adria lithosphere under a NW-trending horizontal compression. The observed compression is a secondary process possibly explained by differential motion within the Adriatic lithosphere. Fault geometry and kinematics is controlled by pre-existing structures.
    Description: Published
    Description: 89-94
    Description: JCR Journal
    Description: reserved
    Keywords: seismological data ; 04. Solid Earth::04.06. Seismology::04.06.03. Earthquake source and dynamics ; 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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