Alessio Piatanesi

Alessio Piatanesi
National Institute of Geophysics and Volcanology | INGV · Section of Seismology and Tectonophysics

About

114
Publications
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3,596
Citations
Citations since 2017
20 Research Items
1426 Citations
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2017201820192020202120222023050100150200250300
2017201820192020202120222023050100150200250300

Publications

Publications (114)
Article
The westernmost Mediterranean hosts part of the plate boundary between the European and African tectonic plates. Based on the scattered instrumental seismicity, this boundary has been traditionally interpreted as a wide zone of diffuse deformation. However, recent seismic images and seafloor mapping studies support that most of the plate convergenc...
Article
Full-text available
We present a source solution for the tsunami generated by the Mw 6.6 earthquake that occurred on 2 May 2020, about 80 km offshore south of Crete, in the Cretan Passage, on the shallow portion of the Hellenic Arc subduction zone (HASZ). The tide gauges recorded this local tsunami on the southern coast of Crete and Kasos island. We used Crete tsunami...
Article
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The SW Iberian margin is one of the most seismogenic and tsunamigenic areas in W‐Europe, where large historical and instrumental destructive events occurred. To evaluate the sensitivity of the tsunami impact on the coast of SW Iberia and NW Morocco to the fault geometry and slip distribution for local earthquakes, we carried out a set of tsunami si...
Article
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Tsunami warning centres face the challenging task of rapidly forecasting tsunami threat immediately after an earthquake, when there is high uncertainty due to data deficiency. Here we introduce Probabilistic Tsunami Forecasting (PTF) for tsunami early warning. PTF explicitly treats data- and forecast-uncertainties, enabling alert level definitions...
Article
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The tsunami source of the 2021 MW 8.1 Raoul Island earthquake in the Kermadec subduction zone was estimated by inverting the tsunami signals recorded by Deep‐ocean Assessment and Reporting of Tsunamis (DART) bottom pressure sensors and coastal tide‐gauges. The main asperity of up to 5 m of slip is located northeastward from the hypocenter, with fea...
Preprint
Full-text available
We present a source solution for the tsunami generated by the Mw 6.6 earthquake that occurred on May 2, 2020, about 807thinsp;km offshore south of Crete, in the Cretan Passage, on the shallow portion of the Hellenic Arc Subduction Zone (HASZ). The tide-gauges recorded this local tsunami on the southern coast of Crete island and Kasos island. We use...
Article
Full-text available
Destructive tsunamis are most often generated by large earthquakes occurring at subduction interfaces, but also other “atypical” sources—defined as crustal earthquakes and non-seismic sources altogether—may cause significant tsunami threats. Tsunamis may indeed be generated by different sources, such as earthquakes, submarine or coastal landslides,...
Article
The Italian Tsunami Alert Center based at the Istituto Nazionale di Geofisica e Vulcanologia (CAT-INGV) has been monitoring the Mediterranean seismicity in the past 8 yr to get fast and reliable information for seismically induced tsunami warnings. CAT-INGV is a tsunami service provider in charge of monitoring the seismicity of the Mediterranean Se...
Article
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Inundation maps are a fundamental tool for coastal risk management and in particular for designing evacuation maps and evacuation planning. These in turn are a necessary component of the tsunami warning systems’ last-mile. In Italy inundation maps are informed by a probabilistic tsunami hazard model. Based on a given level of acceptable risk, Itali...
Article
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Finite-fault models for the 2010 M w 8.8 Maule, Chile earthquake indicate bilateral rupture with large-slip patches located north and south of the epicenter. Previous studies also show that this event features significant slip in the shallow part of the megathrust, which is revealed through correction of the forward tsunami modeling scheme used in...
Article
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We investigated the kinematic rupture model of the 2018 Mw 6.8 Zakynthos, Ionian Sea (Greece), earthquake by using a non-linear joint inversion of strong motion data, high-rate GPS time series, and static co-seismic GPS displacements. We also tested inversion results against tide-gauge recordings of the small tsunami generated in the Ionian Sea. In...
Article
Full-text available
The complexity of coseismic slip distributions influences the tsunami hazard posed by local and, to a certain extent, distant tsunami sources. Large slip concentrated in shallow patches was observed in recent tsunamigenic earthquakes, possibly due to dynamic amplification near the free surface, variable frictional conditions or other factors. We pr...
Article
Full-text available
Il Bacino del Mediterraneo ha una ricca storia di terremoti ed eruzioni vulcaniche, che si può ritenere nota a tutti: non credo ci sia qualcuno in Italia, in Grecia o in Turchia che non sia consapevole della elevata sismicità della regione dove vive. Lo stesso discorso vale probabilmente per le eruzioni vulcaniche.Chi in Italia non ha sentito parla...
Article
We investigate the rupture process of the 2016, Mw6.1 Amatrice earthquake, the first shock of a seismic sequence characterized by three damaging earthquakes occurred in central Italy between August and October. We jointly invert strong motion, High-Rate GPS data, GPS, and DInSAR displacements and we adopt ad hoc velocity profiles of the crust below...
Article
Seismological, tsunami and geodetic observations have shown that subduction zones are complex systems where the properties of earthquake rupture vary with depth as a result of different pre-stress and frictional conditions. A wealth of earthquakes of different sizes and different source features (e.g. rupture duration) can be generated in subductio...
Article
Full-text available
The 2015/11/17 Lefkada (Greece) earthquake ruptured a segment of the Cephalonia Transform Fault (CTF) where probably the penultimate major event was in 1948. Using near-source strong motion and high sampling rate GPS data and Sentinel-1A SAR images on two tracks, we performed the inversion for the geometry, slip distribution and rupture history of...
Article
Full-text available
We present a database of pre-calculated tsunami waveforms for the entire Mediterranean Sea, obtained by numerical propagation of uniformly spaced Gaussian-shaped elementary sources for the sea level elevation. Based on any initial sea surface displacement, the database allows the fast calculation of full waveforms at coastal sites by linear superpo...
Article
Full-text available
We present a database of pre-calculated tsunami waveforms for the entire Mediterranean Sea, obtained by numerical propagation of uniformly spaced Gaussian-shaped elementary sources for the sea level elevation. Based on any initial sea surface displacement, the database allows the fast calculation of full waveforms at the 50 m isobath offshore of co...
Article
Tsunami waveform inversion is often used to retrieve information about the causative seismic tsunami source. Tide-gauges record tsunamis routinely; however, compared to deep-ocean sensor data, tide-gauge waveform modeling is more difficult due to coarse/inaccurate local bathymetric models resulting in a time mismatch between observed and predicted...
Article
We propose a procedure for uncertainty quantification in Probabilistic Tsunami Hazard Analysis (PTHA), with a special emphasis on the uncertainty related to statistical modelling of the earthquake source in Seismic PTHA (SPTHA), and on the separate treatment of subduction and crustal earthquakes (treated as background seismicity). An event tree app...
Article
Full-text available
In this paper we present and discuss the performance of the procedure for earthquake location and characterization implemented in the Italian Candidate Tsunami Service Provider at the Istituto Nazionale di Geofisica e Vulcanologia (INGV) in Rome. Following the ICG/NEAMTWS guidelines, the first tsunami warning messages are based only on seismic info...
Article
Full-text available
On 6 February 2013 an Mw = 8.0 subduction earthquake occurred close to Santa Cruz Islands at the transition between the Solomon and the New Hebrides Trench. The ensuing tsunami caused significant inundation on the closest Nendo Island. The seismic source was studied with teleseismic broadband P-wave inversion optimized with tsunami forward modellin...
Article
Full-text available
Abstract. In this paper we present the procedure for earthquake location and characterization implemented in the Italian candidate Tsunami Service Provider at INGV in Roma. Following the ICG/NEAMTWS guidelines, the first tsunami warning messages are based only on seismic information, i.e. epicenter location, hypocenter depth and magnitude, which ar...
Conference Paper
Full-text available
Tsunami Service Providers (TSP), providing tsunami warnings in the framework of the systems coordinated by IOC/UNESCO worldwide, and other national tsunami warning centers, are striving to complement, or replace, decision matrices and pre-calculated tsunami scenario databases with FTRT (Faster Than Real Time) tsunami simulations. The aim is to incr...
Article
Probabilistic tsunami hazard analysis (PTHA) relies on computationally demanding numerical simulations of tsunami generation, propagation, and non-linear inundation on high-resolution topo-bathymetric models. Here we focus on tsunamis generated by co-seismic sea floor displacement, that is, on Seismic PTHA (SPTHA). A very large number of tsunami si...
Conference Paper
Full-text available
The current state of the art for the propagation phase in TEWS (Tsunami Early Warning Systems) relies on databases of pre-computed elementary tsunami scenarios and on the linearity of the propagation of tsunami waves in deep waters. The inundation phase sometimes is computed in reduced coastal domains or estimated using empirical formulations, both...
Article
Full-text available
The 2011 Tohoku earthquake (Mw = 9.1) highlighted previously unobserved features for megathrust events, such as the large slip in a relatively limited area and the shallow rupture propagation. We use a Finite Element Model (FEM), taking into account the 3D geometrical and structural complexities up to the trench zone, and perform a joint inversion...
Article
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On March 11th, 2011 (at 05:46:23 UTC) a megaearthquake (M 9.0) occurred near the NE coast of Honshu island ( Japan), originated near the subduction plate boundary between the Pacific and the North America plates. The epicenter has been located at about 130 km East of Sendai city, at a depth of about 32 km. This seismic event has been followed by a...
Conference Paper
We investigated the rupture history of the 2009 April 6th (Mw 6.1) L’Aquila earthquake by using a non-linear inversion of strong motion, GPS and DInSAR data. The joint inversion solution reveals a heterogeneous slip distribution characterized by two main asperities, located up-dip from the hypocentre and south-east wards along strike direction resp...
Article
Full-text available
We present the realization of a fault-source data set designed to become the starting point in regional-scale tsunami hazard studies. Our approach focuses on the para-metric fault characterization in terms of geometry, kinemat-ics, and assessment of activity rates, and includes a system-atic classification in six justification levels of epistemic u...
Article
On 14 June 2008, UTC 23:43, the border of Iwate and Miyagi prefectures was hit by an Mw7 reverse-fault type crustal earthquake. The event is known to have the largest ground acceleration observed to date (~4g), which was recorded at station IWTH25. We analyze observed strong motion data with the objective to image the event rupture process and the...
Article
In this study, we investigate the rupture history of the 2009 April 6 (Mw 6.1) L’Aquila normal faulting earthquake by using a non-linear inversion of strong motion, GPS and DInSAR data. Both the separate and joint inversion solutions reveal a complex rupture process and a heterogeneous slip distribution. Slip is concentrated in two main asperities:...
Article
Full-text available
The 2011 Tohoku-oki (Mw 9.1) earthquake is so far the best-observed megathrust rupture, which allowed the collection of unprecedented offshore data. The joint inversion of tsunami waveforms (DART buoys, bottom pressure sensors, coastal wave gauges, and GPS-buoys) and static geodetic data (onshore GPS, seafloor displacements obtained by a GPS/acoust...
Article
In this study, we investigate the rupture history of the April 6th 2009 (Mw 6.1) L'Aquila normal faulting earthquake by using a nonlinear inversion of strong motion, GPS and DInSAR data. We use a two-stage non-linear inversion technique. During the first stage, an algorithm based on the heat-bath simulated annealing generates an ensemble of models...
Article
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...
Conference Paper
The accurate evaluation of a ground motion intensity measure for future earthquakes is necessary to inform earthquake-engineering decision. One widely adopted strategy is the probabilistic approach that uses the ground motion predictive equations to assess a ground motion intensity measure. Nevertheless at present the available empirical models are...
Article
Full-text available
The Giant 2011 Tohoku-oki (Mw 9.0) earthquake is the largest seismic event ever occurred in Japan during the instrumental era. Several seismological, geodetic and marine observational networks provided an unprecedented amount of high quality data. Here we perform a joint inversion of tsunami waveforms and static geodetic data to retrieve a robust p...
Article
A reliable Probabilistic Tsunami Hazard Assessment (PTHA) requires an enormous computational effort. We are developing an approach for limiting the computational burden while trying to preserve the variability of the tsunamigenic seismic sources. We split the PTHA into two stages: linear PTHA and nonlinear PTHA. In the first stage, we explore a lar...
Article
Full-text available
1] The 6 April 2009 M w 6.3 L'Aquila destructive earthquake was successfully recorded by closely spaced 10 Hz and 1 Hz recording GPS receivers and strong motion accelerometers located above or close to the 50° dipping activated fault. We retrieved both static and dynamic displacements from very high rate GPS (VHRGPS) recordings by using Precise Poi...
Article
Full-text available
The Mw 8.8 mega-thrust earthquake and tsunami that occurred on 27 February 2010 offshore the Maule region, Chile, was not unexpected. A clearly identified seismic gap existed in an area where tectonic loading has been accumulating since the great 1835 earthquake. Here we jointly invert tsunami and geodetic data to derive a robust model for the cose...
Article
The MW 8.8 mega-thrust earthquake and tsunami that occurred on February 27, 2010, offshore Maule region, Chile, didn't come unexpected. A clearly identified seismic gap existed in an area where tectonic loading was accumulating since the last Mw~8.5 earthquake in 1835. Did this earthquake fill the gap, decreasing the probability for a future shock?...
Article
Full-text available
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...
Article
Full-text available
We study the 2003 Mw 8.1 Tokachi-oki earthquake, a great interplate event that occurred along the southwestern Kuril Trench and generated a significant tsunami. To determine the earthquake slip distribution, we perform the first joint inversion of tsunami waveforms measured by tide gauges and of coseismic displacement measured both by GPS stations...
Article
In the framework of the agreement between Italian Civil Protection and INGV (DPC-S3 project), we are studying the feasibility of a Tsunami Early Warning System (TEWS) for the coasts of Italy. The underlying concept is borrowed, as a starting point, from the Japan Meteorological Agency's TEWS. Some differences arise, however, due to the specificity...
Article
We present preliminary results of a Probabilistic Tsunami Hazard Analysis (PTHA) for the coast of eastern Sicily. We only consider earthquake-generated tsunamis. We focus on important cities such as Messina, Catania, and Augusta. We consider different potentially tsunamigenic Source Zones (SZ) in the Mediterranean basin, basing on geological and se...
Article
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 casualties 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. The identification of the f...
Article
Full-text available
We have quantified the effects of a water mass redistribution associated with the propagation of a tsunami wave on the Earth’s pole path and on the Length-Of-Day (LOD) and applied our modeling results to the tsunami following the 2004 giant Sumatra earthquake. We compared the result of our simulations on the instantaneous rotational axis variations...
Article
In the framework of the agreement between Italian Civil Protection and INGV (DPC-S3 project), we are studying the feasibility of a Tsunami Early Warning System (TEWS) for the coasts of Italy. The performances of such a prototype TEWS have been evaluated. The underlying concept is borrowed from the Japan Meteorological Agency’s TEWS. This tsunami wa...
Article
Full-text available
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...
Article
Full-text available
High-frequency GPS data can be used for the study of an earthquake rupture process. If GPS stations are available, using epoch-by-epoch coordinate time series it is possible to determine the permanent co-seismic offset and the dynamic displacement with high accuracy. Although data collected at 1-Hz sampling rates can be enough to retrieve the ruptu...
Article
Full-text available
We image the rupture history of the 2009 L'Aquila (central Italy) earthquake using a nonlinear joint inversion of strong motion and GPS data. This earthquake ruptured a normal fault striking along the Apennines axis and dipping to the SW. The inferred slip distribution is heterogeneous and characterized by a small, shallow slip patch located up-dip...
Article
In this study, we aim to understand the dependence of the critical slip weakening distance (Dc) on the final slip (Dtot) during the propagation of a dynamic rupture and the consistency of their inferred correlation. To achieve this goal we have performed a series of numerical tests suitably designed to validate the adopted numerical procedure and t...
Article
After a whole century, the causative source of the tsunami remains one of the most discussed issues about the 1908 earthquake. Recently, two papers reached substantially opposite conclusions and have raised the debate again. The authors of the first paper hypothesize that the origin of the tsunami should be related to a large submarine landslide; c...
Article
We (re)analyzed the causative source of the 26 December 2004 Sumatra-Andaman earthquake and tsunami. We performed nonlinear joint inversion of an in-homogeneous dataset made up of tide-gages, satellite altimetry, and far-field GPS recordings. The purpose is two-fold: (1) the retrieval of the main kinematics rupture parameters (slip, rake, rupture v...
Article
Full-text available
We calculated the expected impact on the Italian coast of the Adriatic Sea of a large set of tsunamis resulting from potential earthquakes generated by major fault zones. Our approach merges updated knowledge on the regional tectonics and scenario-like calculations of expected tsunami impact. We selected six elongated potential source zones. For ea...
Article
Vertical coseismic displacements recorded in corals on the Sumatran forearc offer a unique opportunity to reconstruct past earthquakes on the Sunda megathrust. These observations not only constrain the time and magnitude of the 1797 event but also place some bounds on possible slip distributions for this great earthquake. Here we explore the range...
Article
We infer the slip distribution along the rupture zone of the September 25, 2003 Hokkaido Region (Japan) from tide-gages records of the tsunami, pressure gages, and GPS measured static coseismic displacements. According to USGS, this one has been the largest earthquake in 2003. We select waveforms from 16 stations, distributed along the east coast o...
Article
After a whole century, the causative source of the tsunami remains one of the most discussed issues about the 1908 earthquake. Recently, two papers reached substantially opposite conclusions and have raised the debate again. The authors of the first paper hypothesize that the origin of the tsunami should be related to a large submarine landslide; c...
Article
Full-text available
We image the rupture history of the 2007 Niigata-ken Chuestu-oki (Japan) earthquake by a nonlinear joint inversion of strong motion and GPS data, retrieving peak slip velocity, rupture time, rise time and slip direction. The inferred rupture model contains two asperities; a small patch near the nucleation and a larger one located 10 ÷ 15 km to the...
Article
The April 18, 1906 M8 California earthquake generated a small local tsunami that was 15 recorded in the near-field by the Presidio, San Francisco tide-gage, located near the Golden Gate. We investigate the causative, tsunamigenic seismic source by forward modeling and nonlinear inversion of the Presidio marigram. We use existing seismological and g...
Article
Full-text available
We infer the slip distribution and average rupture velocity of the magnitude MW 8.4 September 12, 2007, southern Sumatra earthquake from available tide-gauge records of the ensuing tsunami. We select 9 waveforms recorded along the west coast of Sumatra and in the Indian Ocean. Slip distribution and rupture velocity are determined simultaneously by...
Article
Full-text available
Several independent indicators imply a high probability of a great (M > 8) earthquake rupture of the subduction megathrust under the Mentawai Islands of West Sumatra. The human consequences of such an event depend crucially on its tsunamigenic potential, which in turn depends on unpredictable details of slip distribution on the megathrust and how r...