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Publications (68)
During May 2022, a short-lived seismic swarm affected a small area of the Chianti fiorentino region about 15 km south of Florence. The two strongest earthquakes of the swarm reached MW 3.7; nonetheless, they were distinctly felt up to distances of several tens of kilometers, causing residents’ concern. Moreover, the presence of a huge artistic heri...
An accurate survey of old and new datasets allowed us to probe the nature and role of fluids in the seismogenic processes of the Apennines mountain range in Italy. New datasets include the 1985–2021 instrumented seismicity catalog, the computed seismogenic thickness, and geodetic velocities and strains, whereas data from the literature comprise foc...
Moment tensor inversions of broadband velocity data are usually managed by adopting Green's functions for 1D layered seismic wave speed models. This assumption can impact on source parameter estimates in regions with complex 3D heterogeneous structures and discontinuities in rock properties. In this work, we present a new centroid moment tensor (CM...
On 18 January 2017, the 2016-2017 Amatrice-Visso-Norcia earthquakes sequence in Central Italy reached the Campotosto area with four M>5 events occurring in three hours. This fault remained as the last, 2009-2016 unruptured part of the central Apennines fault system from L’Aquila to Visso. On-going debate is focused on the vertical continuity of the...
Numerical simulations of earthquake ground motions are used both to anticipate the effects of hypothetical earthquakes by forward simulation and to infer the behaviour of the real earthquake source ruptures by the inversion of recorded ground motions. In either application it is necessary to assume some Earth structure that is necessarily inaccurat...
La sequenza sismica Amatrice-Visso-Norcia (AVN s.s. nel seguito) include il terremoto
più forte avvenuto negli ultimi 30 anni in Italia ed è caratterizzata da molteplici eventi di
magnitudo superiore a 5.0. La sequenza sismica è iniziata il 24 agosto 2016 con due
terremoti di Mw 6.0 e Mw 5.4 nella zona di Amatrice (RI) ed è proseguita con altri due...
Nel primo quadrimestre 2018 si sono verificati in Italia cinque eventi di magnitudo superiore o uguale a 4.0, di cui nessuno di magnitudo superiore a 5.0. Due di essi, avvenuti il 4 (MW 4.0) e il 10 aprile (MW 4.6), hanno interessato la zona della sequenza dell’Italia centrale, in provincia di Macerata. Un terremoto di magnitudo MW 4.3 è avvenuto i...
Nel secondo quadrimestre 2018 si sono verificati in Italia cinque eventi di magnitudo superiore o uguale a 4.0, di cui uno di magnitudo superiore a 5.0. Tre di essi, avvenuti il 14 (MW 4.6) e il 16 agosto (MW 5.1 e MW 4.4), hanno interessato la provincia di Campobasso, ad una profondità di circa 20 km. Due terremoti profondi, avvenuti il 14 luglio...
On 18 January 2017, the 2016–2017 central Italy seismic sequence reached the Campotosto area with four events with magnitude larger than 5 in three hours (major event Mw 5.5). To study the slip behavior on the causative fault/faults we followed two different methodologies: (1) we use Interferometric Synthetic Aperture Radar (InSAR) interferograms (...
Nel secondo quadrimestre 2017si sono verificati cinqueeventi di magnitudo superioreo uguale a 4.0,dei quali nessuno di magnitudo superiore a 5.0. Uno di questi, avvenuto il 21 agosto,pur essendo di magnitudo Md=4.0 (Mw=3.9) ha causato gravi danni nell’isola di Ischia.L’evento più forte del quadrimestre è un terremotoprofondo (ipocentro a profondità...
Nel terzoquadrimestre 2017si sono verificati dueeventi di magnitudo superioreo uguale a 4.0,dei qualinessuno di magnitudo superiore a 5.0. L’evento più forte,verificatosi il 19 novembre in provincia di Parma,è stato dimagnitudo MW=4.4eparametri ipocentralicon coordinate geografiche (44.66N,10.03E)eprofondità di22 km. Unsolo evento di magnitudo MW=4...
La sequenza sismica Amatrice-Visso-Norcia (AVN s.s. nel seguito) include il terremoto più
forte avvenuto negli ultimi 30 anni in Italia ed è caratterizzata da molteplici eventi di
magnitudo superiore a 5.0. La sequenza sismica è iniziata il 24 agosto 2016 con due
terremoti di Mw 6.0 e Mw 5.4 nella zona di Amatrice (RI) ed è proseguita con altri due...
La sequenza sismica Amatrice-Visso-Norcia (AVN.s.s nel seguito) include il terremoto più forte avvenuto negli ultimi 30 anni in Italia. La sequenza sismica è iniziata il 24 agosto 2016 con due terremoti di Mw 6.0 e Mw 5.4 che hanno provocato ingenti danni e 294 morti; questi eventi sono stati seguiti da migliaia di aftershocks. Altri due terremoti...
I parametri dei terremoti registrati dalla Rete Sismica Nazionale Italiana, localizzati nella sala di monitoraggio di Roma, sono immediatamente disponibili sul web alla pagina http://cnt.rm.ingv.it/ e nell’Italian Seismological Instrumental and parametricData-base (ISIDe working group (2016) version 1.0, DOI: 10.13127/ISIDe). Gli analisti del Bolle...
The Amatrice-Visso-Norcia seismic sequence is the most important of the last 30 years in Italy. The seismic sequence started on 24 August, 2016 and still is ongoing in central Apennines. At the end of February 2017 more than 57,000 events were located, 80,000 events up to the end of September 2017 (Fig. 1). The mainshocks of the sequence occurred o...
We study the October 30th 2016 Norcia earthquake (MW 6.5) to retrieve the rupture history by jointly inverting seismograms and coseismic GPS displacements obtained by dense local networks. The adopted fault geometry consists of a main normal fault striking N155°and dipping 47° belonging to the Mt. Vettore-Mt. Bove fault system (VBFS) and a secondar...
The 2016 central Italy seismic sequence consists so far of a series of moderate-to-large earthquakes activating within a fewmonths along a 60-km-long and Apenninic-trending normal-fault system. Regrettably, the high vulnerability of the local infrastructure and the shallowness of the largest events (depth around 8 km) resulted in 299 casualties and...
Alle 18.55 UTC del 16 gennaio 2016 è stato registrato dalla Rete Sismica Nazionale1 (RSN, http://doi.org/10.13127/SD/X0FXNH7QFY) dell’Istituto Nazionale di Geofisica e Vulcanologia (INGV) un terremoto di magnitudo locale (M ) 4.1 (magnitudo momento M 4.3) ben risentito in gran parte delle province di Campobasso e di Isernia e in alcune zone delle p...
The central Italy seismic sequence, started with the Mw = 6.0 Amatrice earthquake on August 24th 2016, is
the first significant one after the Italian Seismic Bulletin (BSI) changed its analysis strategies in 2015.
These new strategies consist on the release of the BSI every four months, the review of the events with ML ≥
1.5 and the priority on the...
The physical mechanisms governing slow earthquakes remain unknown, as does the relationship between slow and regular earthquakes. To investigate the mechanism(s) of slow earthquakes and related quasi-dynamic modes of fault slip we performed laboratory experiments on simulated fault gouge in the double direct shear configuration. We reproduced the f...
We present the revised Time Domain Moment Tensor (TDMT) catalogue for earthquakes with ML larger than 3.6 of the first month of the ongoing Amatrice seismic sequence (August 24th-September 25th). Most of the retrieved focal mechanisms show NNW-SSE striking normal faults in agreement with the main NE-SW extensional deformation of Central Apennines....
Nella Struttura Terremoti dell’INGV la Linea di Attività T5 “Sorveglianza sismica ed operatività post- terremoto” si occupa delle attività di sviluppo di strumenti e procedure per la valutazione in tempo reale degli effetti di terremoti e tsunami e della gestione delle emergenze sismiche. Uno dei suoi obiettivi del 2015 era la formalizzazione dei p...
The Istituto Nazionale di Geofisica e Vulcanologia (INGV) is an Italian research institution, with focus on Earth Sciences. INGV runs the Italian National Seismic Network (Rete Sismica Nazionale, RSN) and other networks at national scale for monitoring earthquakes and tsunami as a part of the National Civil Protection System coordinated by the Ital...
In the framework of INGV Earthquake Department organization, the Research Activity named "Sorveglianza sismica ed operatività post-terremoto" (Seismic survey and post-earthquake operativity" (T5) takes care of the development of tools and procedures for the real time evaluation of earthquake effects and the management of seismic emergency. One of m...
La sequenza sismica che ha seguito il terremoto di magnitudo momento M W = 6.0 di Amatrice del 24 agosto 2016 è la prima sequenza rilevante che avviene da quando, all'inizio del 2015, le modalità di analisi del Bollettino Sismico Italiano (BSI) sono state aggiornate (Nardi et al., 2015). Queste modalità prevedono la pubblicazione del BSI ogni quatt...
Citare come: Bollettino Sismico Italiano gruppo di lavoro Amatrice (2016). Rapporto preliminare sulle attività svolte dal gruppo Bollettino Sismico Italiano a seguito del terremoto di Amatrice Mw 6.0 (24 agosto 2016, Italia centrale).
On 24th August 2016 a magnitude ML 6.0 occurred in the central Apennines (Italy) between Amatrice and Norcia causing nearly 300 fatalities. The mainshock ruptured a NNW-SSE striking, WSW dipping normal fault. We invert waveforms from 26 three components strong motion accelerometers, filtered between 0.02-0.5 Hz, within 45 km from the fault. The inf...
Seismic moment tensor is one of the most important source parameters defining the earthquake dimension and style of the activated fault. Geoscientists ordinarily use moment tensor catalogues, however, few attempts have been done to assess possible impacts of moment magnitude uncertainties upon their analysis. The 2012 May 20 Emilia main shock is a...
I parametri dei terremoti registrati dalla Rete Sismica Nazionale Italiana, localizzati nella sala di sorveglianza sismica dell’INGV, sono immediatamente disponibili sul web alla pagina http://cnt.rm.ingv.it/ e nell’Italian Seismological Instrumental and parametric Data-base (ISIDe; Mele et al. 2007) http://iside.rm.ingv.it/iside/standard/index.jsp...
A seguito della sequenza sismica iniziata il 29 dicembre 2013 con il terremoto di magnitudo (ML) 4.9 alle 16.08 UTC, localizzato tra le province di Caserta e di Benevento dai sismologi in turno presso la sala di sorveglianza sismica [Basili, 2011] dell’Istituto Nazionale di Geofisica e Vulcanologia (INGV), sono stati predisposti diversi interventi...
In this study we have investigated the directivity associated with the initial up-dip rupture propagation during the 2009 April 6 (Mw 6.1) L'Aquila normal-faulting earthquake. The objective is the understanding of how the peculiar initial behaviour of rupture history during the main shock has affected the near-source recorded ground motions in the...
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...
On May 4, 2012, a new system, known as the AIDA (Advanced Information and Data Acquisition) system for seismology, became operational as the primary tool to monitor, analyze, store and distribute seismograms from the Italian National Seismic Network. Only 16 days later, on May 20, 2012, northern Italy was struck by a Ml 5.9 earthquake that caused s...
p>On May 20, 2012 (02:03:53 UTC), an Mw 5.86 (Ml 5.9) earthquake struck the Pianura Padana Emiliana region (northern Italy), causing five deaths and damage to several villages and to the towns of Ferrara and Modena. The mainshock was preceded, three hours earlier, by a Mw 3.98 (Ml 4.1) foreshock, which almost co-located with the main event. After t...
In this study we have investigated the directivity associated with the initial up-dip rupture propagation during the 2009 April 6 (Mw 6.1) L’Aquila normal-faulting earthquake. The ob- jective is the understanding of how the peculiar initial behaviour of rupture history during the main shock has affected the near-source recorded ground motions in th...
The Pollino region and the whole Calabria-Lucania border are known for the
absence of destructive (M>6) historical earthquakes. This lack of historical seismicity is noticeable
in the analysis of Southern Apennines and Calabria earthquake history (Rovida et al., 2011). At the
same time, paleoseismological studies found evidence for significant acti...
On 6 April 2009, a magnitude Mw = 6.1 earthquake struck the Abruzzi region in central Italy. Despite its moderate size, the earthquake caused more than 300 fatalities and partially destroyed the city of L’Aquila and many surrounding villages. In this study we present a retrospective analysis of the rapid source parameters determination procedure de...
Earthworm is one of the most widespread tools, in the seismological community, for real time processing of regional network data. Thanks are due to Carl Johnson who gave the first set of principia Earthworm development is based on, as scalability, flexibility, easy real-time data exchange, modularity and support [Johnson et al., 1995]. Although its...
On April 6th 2009, a magnitude Mw=6.3 earthquake occurred in L'Aquila, Central Italy, causing wide damages and killing almost 300 people. The mainshock was followed by thousands of aftershocks and occurred after some months of small but felt earthquakes. This important event, the largest since the 1980 Mw=6.9 Irpinia earthquake, and the huge amount...
On April 6th 2009, a magnitude Mw=6.3 earthquake struck the Abruzzi
region in central Italy. Despite its moderate size, the earthquake
caused 293 fatalities and partially destroyed the city of L’Aquila
and many villages in its surroundings. The main shock was preceded by an
earthquake swarm, which started at the end of 2008. The largest
earthquakes...
The 2009 L’Aquila earthquake (Mw 6.3) occurred in the Central
Apennines (Italy) on April 6th at the 01:32 UTC and caused nearly 300
fatalities and heavy damages in the L’Aquila town and in several
villages nearby. The main shock ruptured a normal fault striking along
the Apennine axis and dipping at nearly 50° to the SW. Most of the
aftershocks are...
We test the physically-based ground motion hazard prediction methodology of Hutchings et al. [Hutchings, L., Ioannidou, E., Kalogeras, I., Voulgaris, N., Savy, J., Foxall, W., Scognamiglio, L., and Stavrakakis, G., (2007). A physically-based strong ground motion prediction methodology; Application to PSHA and the 1999 M = 6.0 Athens Earthquake. Geo...
We describe the automatic (AUTO) and the reviewed (REV) seismic time-domain moment tensor (TDMT) procedures implemented recently at the Istituto Nazionale di Geofisica e Vulcanologia (INGV), Italy. The solutions are obtained from the high-quality data of the recently installed Italian broadband network and of the Mediterranean seismographic network...
We propose the generic site response for Mesozoic carbonate rocks outcropping in Abruzzo region (Central Italy). In order to determine the absolute site response at the twenty-one Abruzzo Regional network stations, we used 478 events with moment magnitudes ranged between 2.0 and 4.1. Absolute site effects are evaluated by deconvolving the detailed...
La rete sismica MedNet (Mediterranean Network) nasce alla fine degli anni ’80 con due obiettivi principali: migliorare la conoscenza della struttura tettonica del Mediterraneo attraverso lo studio della sorgente di terremoti forti e moderati e applicare queste conoscenze per la mitigazione del rischio sismico nella regione mediterranea. A questi ob...
The scaling of earthquakes of the Central Apennines (Italy) is investigated using broadband seismograms from the Colfiorito sequence (4 M W 6). Our results are not consistent with self-similar scaling, and can be described by the following relationship: M 0 / f c À(3 + e) , where e = 1.7 ± 0.3. We speculate that dynamic fault lubrication by fluid p...
1] The scaling of earthquakes of the Central Apennines (Italy) is investigated using broadband seismograms from the Colfiorito sequence (4 M W 6). Our results are not consistent with self-similar scaling, and can be described by the following relationship: M 0 / f c À(3 + e) , where e = 1.7 ± 0.3. We speculate that dynamic fault lubrication by flui...
UNESCO has committed the scientific community for the creation of the
North East Atlantic and Mediterranean Tsunami Warning System (NEAMTWS).
We wonder: "Is the European Seismological community ready for running a
Euro Mediterranean Tsunami Warning System?" In this study we use the
February 12, 2007 Ml=6.1 earthquake, occurred close to the epicente...
MedNet (Mediterranean Network) is a network of very broad band seismic stations installed in countries surrounding the Mediterranean Sea. The project started in 1987, with the aim of providing high quality real-time data to the comprehension of one of the most active seismic regions of the World. Its main objectives were mapping the structure of th...
We develop a new methodology to determine apparent attenuation for the regional seismic phases Pn, Pg, Sn, and Lg using coda-derived source spectra. The local-to-regional coda methodology (Mayeda, 1993; Mayeda and Walter, 1996; Mayeda et al., 2003) is a very stable way to obtain source spectra from sparse networks using as few as one station, even...
We present a physically based methodology to predict the range of
ground-motion hazard for earthquakes along specific faults or within
specific source volumes, and we demonstrate how to incorporate this
methodology into probabilistic seismic hazard analyses (PSHA). By
`physically based,' we refer to ground-motion syntheses derived from
physics and...
The Green's functions used in this procedure were computed with a frequency-wave number integration code (Saikia 1994). The model used to compute Green's functions is shown in Table 1. To reduce the time of the automatic procedure, the Green's functions for three fundamental faults (vertical strike-slip, vertical dip-slip and 45° dip-slip) are stor...
We analyze the usefulness of stochastic time series as Green's functions
in finite fault rupture modeling by modeling observed accelerograms from
the 1997 Colfiorito earthquake. We create synthetic high frequency
Green's functions (> 1.0 Hz) with Gaussian white noise shaped by an
envelope function, and modified by attenuation, geometrical spreading...
We describe the characteristics of crustal wave propagation in eastern Sicily by using the background seismicity of the area.
We follow the approach described by Malagnini, Hermann, and Di Bona (2000) and Malagnini et al. (2002). Our data set consists of 106 earthquakes recorded by nine three-component digital seismic stations between 1994 and 2001...
We test a methodology to "predict" ground-motion hazard for a fixed magnitude earthquake along a specific fault or within a specific source volume. In our test, we develope constraints on rupture parameters of the 1997 Colfiorito (Italy) earthquake based on previous studies. Then we develope a suite of 100 rupture scenarios for this fault, and synt...
A large data set of ground-velocity time histories from earthquakes that occurred in Friuli-Venezia Giulia (northeastern Italy) was used to define regional predictive relationships for ground motion, in the 0.25-to 14.0-Hz frequency band. The bulk of the data set was provided by the seismic network run by Centro Ricerche Sismologiche (CRS), a depar...
A large data set of ground-velocity time histories from earthquakes that occurred in Friuli-Venezia Giulia (northeastern Italy) was used to define regional predictive relationships for ground motion, in the 0.25- to 14.0-Hz frequency band. The bulk of the data set was provided by the seismic network run by Centro Ricerche Sismologiche (CRS), a depa...
Distance scaling of earthquake-induced ground motion is studied in the Erzincan region, located in the eastern part of the North Anatolian Fault zone. The data set used in this study consists of 170 aftershocks of the M S 6.8 Erzincan earthquake of 13 March 1992, with moment magnitudes between 1.5 and 4.0. In order to empirically obtain the scaling...
During the Umbria-Marche, central Italy seismic sequence a small-aperture (Ϸ200 m), four-station array was operating in the Colfiorito plain, a few kilometers away from the epicenters of the M L 5.6 and 5.8 mainshocks of 26 Sep-tember 1997. The array was deployed approximately 500 m from the eastern edge of the basin. We analyze the three-component...
Distance scaling of earthquake-induced ground motion is studied in the Erzincan region, located in the eastern part of the North Anatolian Fault zone. The data set used in this study consists of 170 aftershocks of the M S ס 6.8 Erzincan earthquake of 13 March 1992, with moment magnitudes between 1.5 and 4.0. In order to empirically obtain the sca...
Distance scaling of earthquake-induced ground motion is studied in the Erzincan region, located in the eastern part of the North Anatolian Fault zone. The data set used in this study consists of 170 aftershocks of the M S ס 6.8 Erzincan earthquake of 13 March 1992, with moment magnitudes between 1.5 and 4.0. In order to empirically obtain the sca...
We regressed a data-base of 2996 selected recordings from 264 events
with magnitude ranging from 1.0 to 4.3 from earthquakes occurred in
Eastern Sicily, and calibrated the regional predictive relationships for
the ground motion in the 0.5-16.0 Hz frequency band. Relationships
proposed here represent the average crustal response of the region; they...
Distance scaling of earthquake-induced ground motion is studied in the Erzincan region, located in the eastern part of the North Anatolian Fault zone. The data set used in this study consists of 170 aftershocks of the M S 6.8 Erzincan earthquake of 13 March 1992, with moment magnitudes between 1.5 and 4.0. In order to empirically obtain the scaling...
