Abstract A new seismic network (ISNet, Irpinia Seismic Network) is now operating in the Southern ... more Abstract A new seismic network (ISNet, Irpinia Seismic Network) is now operating in the Southern Italy. It is conceived as the core infrastructure for an Earthquake Early Warning System (EEWS) under development in Southern Italy. It is primarily aimed at providing an alert for moderate to large earthquakes (M> 4) to selected target sites in Campania Region and it also provides data for rapid computation of regional ground-shaking maps.
Abstract he Campi Flegrei (CF) alkali-trakitic caldera is an active volcanic system located 15 km... more Abstract he Campi Flegrei (CF) alkali-trakitic caldera is an active volcanic system located 15 km west of the city of Naples, southern Italy, covering an area of about 400 km2. It is located within a NE-SW trending large graben (Campanian Plain) formed, at eastern margin of the Tyrrhenian sea, in the Plio-Pleistocene that is bordered by mostly Mesozoic carbonaceous rocks. CF is the northernmost of a group of Pleistocene volcanoes three of which (Ischia, CF and Vesuvius) have erupted in historical times.
Abstract The great 11 March 2011 Off the Pacific Coast of Tohoku earthquake (Mw 9.1) ruptured a~ ... more Abstract The great 11 March 2011 Off the Pacific Coast of Tohoku earthquake (Mw 9.1) ruptured a~ 200 km wide mega-thrust fault, with average displacement of~ 15-20 m. The earthquake triggered a large devastating tsunami as well as strong ground motion along the east Honshu coastline.
Abstract The Campi Flegrei caldera is located 15 km west of the city of Naples (southern Italy), ... more Abstract The Campi Flegrei caldera is located 15 km west of the city of Naples (southern Italy), and has experienced in 1970-72 and 1982-84 two relevant ground uplift phenomena accompanied by an intense microseismic activity. Its structural features are still debated, as, in particular, the possible depth of the carbonatic basement beneath the caldera, the shape of the buried caldera rim at sea, the location and geometry of the magmatic feeding system.
Abstract A prototype system for earthquake early warning and rapid shake map evaluation is being ... more Abstract A prototype system for earthquake early warning and rapid shake map evaluation is being developed and tested in southern Italy based on a dense, wide dynamic-range seismic network (accelerometers+ seismometers) under installation in the Apenninic belt region (Irpinia Seismic Network). This system forms a regional Earthquake Early Warning System consisting of a seismic sensor network covering a portion of the expected epicentral area for large earrthquakes.
Abstract The ISNet (Irpinia Seismic Network) consists of 29 six-components seismic stations deplo... more Abstract The ISNet (Irpinia Seismic Network) consists of 29 six-components seismic stations deployed in a 100× 70 km2 area in Southern Italy, containing the fault system that generated the 1980, M= 6.9, Irpinia earthquake. The seismic stations, equipped with both accelerometers and seismometers, are able to follow both the strong and the weak motion.
Abstract In recent years a new approach to earthquake rupture imaging has emerged, based on the e... more Abstract In recent years a new approach to earthquake rupture imaging has emerged, based on the exploitation of the coherency of the seismic signal recorded at modern seismic networks. A dense station deployment can be used as an antenna to track the energy radiated by the propagating rupture along the fault. This energy, coherently recorded at the stations, is back propagated to its most likely position in the source region.
Abstract We investigated the rupture process of the 2010 Mw 8.8 Maule earthquake by back projecti... more Abstract We investigated the rupture process of the 2010 Mw 8.8 Maule earthquake by back projecting teleseismic body waves energy recorded at several worldwide seismic stations and arrays. This approach, being a signal-processing technique, does not require any a-priori knowledge or assumption on the source (hypocentral location, origin time, rupture velocity, fault extent and orientation), and is thus able to provide an independent picture of the rupture process, respect to classic inversion schemes.
Abstract The Irpinia Seismic Network is an high dynamics, high density seismographic network unde... more Abstract The Irpinia Seismic Network is an high dynamics, high density seismographic network under development in the Southern Apenninic chain. It is deployed in the area stroken by several destructive earthquakes during last centuries. In its final configuration the network will consist of more than fourty high dynamic seismic stations subdivided in physical subnetworks inter-connected by a robust data transmission system.
Abstract In recent years the seismic observation has made a huge leap forward in terms of coverag... more Abstract In recent years the seismic observation has made a huge leap forward in terms of coverage and density of recording stations. This instrumental effort has fostered the development of new approaches to the study of the seismic rupture, which can potentially support and complement the classical finite source kinematic modeling.
ABSTRACT A regional EEWS is based on a dense sensor network covering a part of or the entire seis... more ABSTRACT A regional EEWS is based on a dense sensor network covering a part of or the entire seismic source area. The relevant source parameters (event location and magnitude) are estimated from the early portion of the recorded signals and are used to predict, with a quantified confidence, a ground motion intensity measure at a distant location where a target site of interest is located.
The 11 April 2012 Mw 8.6 earthquake offshore Sumatra is the largest of the rare great intraplate ... more The 11 April 2012 Mw 8.6 earthquake offshore Sumatra is the largest of the rare great intraplate earthquakes of the instrumental era. This major strike-slip event occurred in the diffuse zone of deformation that accommodates differential rotation between Indian and Australian plates. We perform a back projection analysis – calibrated with well-located aftershocks – of short-period teleseismic P-waves recorded by the European array to image the rupture process during the mainshock. In complement, a Love wave analysis is conducted for tracking azimuthal change in the apparent global source duration due to the source spatio-temporal extent. The combined analysis reveals a complex rupture pattern, characterized by three main episodes of energy release, the latest being located 370 km west of the epicenter, on the Ninety East Ridge, with a delay of 120 s. We interpret the 11 April 2012 Mw 8.6 offshore Sumatra earthquake as a complex westward-propagating sequence of dynamically triggered strike-slip fault ruptures, associated to the reactivation of the inherited NNE–striking sea floor fabric. The dynamic triggering mechanism could result from the interaction between transient surface wave stress perturbations and fluids.
The Campi Flegrei caldera (southern Italy) is one of the most hazardous areas in the world becaus... more The Campi Flegrei caldera (southern Italy) is one of the most hazardous areas in the world because it is home to several hundred thousand people live there and an important center of socio-economic activities. The caldera includes the westernmost part of the city of Naples and extends into the Gulf of Pozzuoli (eastern Tyrrhenian basin; Figure 1).
The uplift crisis of the 1982-1984 in the Campi Flegrei area underlined the importance of seismic... more The uplift crisis of the 1982-1984 in the Campi Flegrei area underlined the importance of seismic surveillance for this volcanic caldera. One of the key elements for an effective seismic network is to make use of a reliable velocity model for earthquake location. In the present work we will discuss criteria for the construction and validation of a new 3D P-wave velocity model for earthquake location in the Campi Flegrei area built from the integration of two high-resolution 3D tomographic images of the region.
The moment tensor solution is determined by modelling the strong-motion waveforms using two diffe... more The moment tensor solution is determined by modelling the strong-motion waveforms using two different approaches. The former one uses the point source approximation and performs a grid search over a set of trial source positions and time shifts in order to identify the optimal centroid position, time and moment tensor through a minimization of the residual errors. In the second method the rupture is represented by a finite 1D source model. Source finiteness is approximated by a summation over point sources aligned along fault strike.
Abstract A new seismic network (ISNet, Irpinia Seismic Network) is now operating in the Southern ... more Abstract A new seismic network (ISNet, Irpinia Seismic Network) is now operating in the Southern Italy. It is conceived as the core infrastructure for an Earthquake Early Warning System (EEWS) under development in Southern Italy. It is primarily aimed at providing an alert for moderate to large earthquakes (M> 4) to selected target sites in Campania Region and it also provides data for rapid computation of regional ground-shaking maps.
Abstract he Campi Flegrei (CF) alkali-trakitic caldera is an active volcanic system located 15 km... more Abstract he Campi Flegrei (CF) alkali-trakitic caldera is an active volcanic system located 15 km west of the city of Naples, southern Italy, covering an area of about 400 km2. It is located within a NE-SW trending large graben (Campanian Plain) formed, at eastern margin of the Tyrrhenian sea, in the Plio-Pleistocene that is bordered by mostly Mesozoic carbonaceous rocks. CF is the northernmost of a group of Pleistocene volcanoes three of which (Ischia, CF and Vesuvius) have erupted in historical times.
Abstract The great 11 March 2011 Off the Pacific Coast of Tohoku earthquake (Mw 9.1) ruptured a~ ... more Abstract The great 11 March 2011 Off the Pacific Coast of Tohoku earthquake (Mw 9.1) ruptured a~ 200 km wide mega-thrust fault, with average displacement of~ 15-20 m. The earthquake triggered a large devastating tsunami as well as strong ground motion along the east Honshu coastline.
Abstract The Campi Flegrei caldera is located 15 km west of the city of Naples (southern Italy), ... more Abstract The Campi Flegrei caldera is located 15 km west of the city of Naples (southern Italy), and has experienced in 1970-72 and 1982-84 two relevant ground uplift phenomena accompanied by an intense microseismic activity. Its structural features are still debated, as, in particular, the possible depth of the carbonatic basement beneath the caldera, the shape of the buried caldera rim at sea, the location and geometry of the magmatic feeding system.
Abstract A prototype system for earthquake early warning and rapid shake map evaluation is being ... more Abstract A prototype system for earthquake early warning and rapid shake map evaluation is being developed and tested in southern Italy based on a dense, wide dynamic-range seismic network (accelerometers+ seismometers) under installation in the Apenninic belt region (Irpinia Seismic Network). This system forms a regional Earthquake Early Warning System consisting of a seismic sensor network covering a portion of the expected epicentral area for large earrthquakes.
Abstract The ISNet (Irpinia Seismic Network) consists of 29 six-components seismic stations deplo... more Abstract The ISNet (Irpinia Seismic Network) consists of 29 six-components seismic stations deployed in a 100× 70 km2 area in Southern Italy, containing the fault system that generated the 1980, M= 6.9, Irpinia earthquake. The seismic stations, equipped with both accelerometers and seismometers, are able to follow both the strong and the weak motion.
Abstract In recent years a new approach to earthquake rupture imaging has emerged, based on the e... more Abstract In recent years a new approach to earthquake rupture imaging has emerged, based on the exploitation of the coherency of the seismic signal recorded at modern seismic networks. A dense station deployment can be used as an antenna to track the energy radiated by the propagating rupture along the fault. This energy, coherently recorded at the stations, is back propagated to its most likely position in the source region.
Abstract We investigated the rupture process of the 2010 Mw 8.8 Maule earthquake by back projecti... more Abstract We investigated the rupture process of the 2010 Mw 8.8 Maule earthquake by back projecting teleseismic body waves energy recorded at several worldwide seismic stations and arrays. This approach, being a signal-processing technique, does not require any a-priori knowledge or assumption on the source (hypocentral location, origin time, rupture velocity, fault extent and orientation), and is thus able to provide an independent picture of the rupture process, respect to classic inversion schemes.
Abstract The Irpinia Seismic Network is an high dynamics, high density seismographic network unde... more Abstract The Irpinia Seismic Network is an high dynamics, high density seismographic network under development in the Southern Apenninic chain. It is deployed in the area stroken by several destructive earthquakes during last centuries. In its final configuration the network will consist of more than fourty high dynamic seismic stations subdivided in physical subnetworks inter-connected by a robust data transmission system.
Abstract In recent years the seismic observation has made a huge leap forward in terms of coverag... more Abstract In recent years the seismic observation has made a huge leap forward in terms of coverage and density of recording stations. This instrumental effort has fostered the development of new approaches to the study of the seismic rupture, which can potentially support and complement the classical finite source kinematic modeling.
ABSTRACT A regional EEWS is based on a dense sensor network covering a part of or the entire seis... more ABSTRACT A regional EEWS is based on a dense sensor network covering a part of or the entire seismic source area. The relevant source parameters (event location and magnitude) are estimated from the early portion of the recorded signals and are used to predict, with a quantified confidence, a ground motion intensity measure at a distant location where a target site of interest is located.
The 11 April 2012 Mw 8.6 earthquake offshore Sumatra is the largest of the rare great intraplate ... more The 11 April 2012 Mw 8.6 earthquake offshore Sumatra is the largest of the rare great intraplate earthquakes of the instrumental era. This major strike-slip event occurred in the diffuse zone of deformation that accommodates differential rotation between Indian and Australian plates. We perform a back projection analysis – calibrated with well-located aftershocks – of short-period teleseismic P-waves recorded by the European array to image the rupture process during the mainshock. In complement, a Love wave analysis is conducted for tracking azimuthal change in the apparent global source duration due to the source spatio-temporal extent. The combined analysis reveals a complex rupture pattern, characterized by three main episodes of energy release, the latest being located 370 km west of the epicenter, on the Ninety East Ridge, with a delay of 120 s. We interpret the 11 April 2012 Mw 8.6 offshore Sumatra earthquake as a complex westward-propagating sequence of dynamically triggered strike-slip fault ruptures, associated to the reactivation of the inherited NNE–striking sea floor fabric. The dynamic triggering mechanism could result from the interaction between transient surface wave stress perturbations and fluids.
The Campi Flegrei caldera (southern Italy) is one of the most hazardous areas in the world becaus... more The Campi Flegrei caldera (southern Italy) is one of the most hazardous areas in the world because it is home to several hundred thousand people live there and an important center of socio-economic activities. The caldera includes the westernmost part of the city of Naples and extends into the Gulf of Pozzuoli (eastern Tyrrhenian basin; Figure 1).
The uplift crisis of the 1982-1984 in the Campi Flegrei area underlined the importance of seismic... more The uplift crisis of the 1982-1984 in the Campi Flegrei area underlined the importance of seismic surveillance for this volcanic caldera. One of the key elements for an effective seismic network is to make use of a reliable velocity model for earthquake location. In the present work we will discuss criteria for the construction and validation of a new 3D P-wave velocity model for earthquake location in the Campi Flegrei area built from the integration of two high-resolution 3D tomographic images of the region.
The moment tensor solution is determined by modelling the strong-motion waveforms using two diffe... more The moment tensor solution is determined by modelling the strong-motion waveforms using two different approaches. The former one uses the point source approximation and performs a grid search over a set of trial source positions and time shifts in order to identify the optimal centroid position, time and moment tensor through a minimization of the residual errors. In the second method the rupture is represented by a finite 1D source model. Source finiteness is approximated by a summation over point sources aligned along fault strike.
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Papers by Claudio Satriano