A5065409672- Seismic Waves and Analysis
- earthquake and tectonic studies
- Seismic Performance and Analysis
- Seismic Imaging and Inversion Techniques
- Seismology and Earthquake Studies
- Structural Health Monitoring Techniques
- Earthquake Detection and Analysis
- Geophysics and Sensor Technology
- Advanced Fiber Optic Sensors
- High-pressure geophysics and materials
- Landslides and related hazards
- Geophysical Methods and Applications
- Geological and Geochemical Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Reservoir Engineering and Simulation Methods
- Medical Imaging Techniques and Applications
- Geological and Geophysical Studies Worldwide
- Geochemistry and Geologic Mapping
- Advanced Optical Sensing Technologies
- Advanced Fiber Laser Technologies
- Masonry and Concrete Structural Analysis
- Atomic and Subatomic Physics Research
- Geological and Tectonic Studies in Latin America
- Tree Root and Stability Studies
- Healthcare Decision-Making and Restraints
Istituto Nazionale di Geofisica e Vulcanologia
2013-2024
Radiotelevisione Italiana (Italy)
2024
University of Naples Federico II
1999-2002
Institut de physique du globe de Paris
1993-1996
Universidad Complutense de Madrid
1984
An application of full-waveform tomography to dense onshore wide-aperture seismic data recorded in a complex geological setting (thrust belt) is presented. The waveform modelling and are implemented the frequency domain. part solved with finite-difference method applied visco-acoustic wave equation. inversion based on local gradient method. Only P-wave velocity involved inversion. iteratively discrete components by proceeding from low high frequencies. This defines multiscale imaging sense...
The NEAM Tsunami Hazard Model 2018 (NEAMTHM18) is a probabilistic hazard model for tsunamis generated by earthquakes. It covers the coastlines of North-eastern Atlantic, Mediterranean, and connected seas (NEAM). NEAMTHM18 was designed as three-phase project. first two phases were dedicated to development calculations, following formalized decision-making process based on multiple-expert protocol. third phase documentation dissemination. assessment workflow structured in Steps Levels. There...
Abstract The basic assumption that the self-similarity and spectral law of seismic body-wave radiation (e.g., ω-square model) must find their origin in some simple self-similar process during rupture led us to construct a kinematic, model earthquakes. It is first assumed amplitude slip distribution high-pass filtered at high wavenumber does not depend on size ruptured fault. This leads following “k-square” for spectrum, k > 1/L: Δ~uL(k)=CΔσμLk2, where L fault dimension, radial...
ABSTRACT An integrated multiscale seismic imaging flow is applied to dense onshore wide‐aperture data recorded in a complex geological setting (thrust belt). initial P‐wave velocity macromodel first developed by first‐arrival traveltime tomography. This model used as an guess for subsequent full‐waveform tomography, which leads greatly improved spatial resolution of the model. However, application tomography high‐frequency part source bandwidth difficult, due non‐linearity this kind method....
Abstract The Italian Tsunami Alert Center based at the Istituto Nazionale di Geofisica e Vulcanologia (CAT-INGV) has been monitoring Mediterranean seismicity in past 8 yr to get fast and reliable information for seismically induced tsunami warnings. CAT-INGV is a service provider charge of Sea alerting Intergovernmental Oceanographic Commission (IOC)/UNESCO subscriber Member States Department Civil Protection potentially impending tsunami, framework Warning Mitigation System North-eastern...
Abstract The k-square broadband kinematic model of earthquake rupture proposed by Herrero and Bernard (1994) is reconsidered in order to relax the assumption an instantaneous slip. basic k−2 decay final slip spectrum preserved, as well constant velocity v. rise-time τmax finite, equal L0/v, where L0 width pulse propagating at v along fault (length L). not during slipping phase; otherwise, would produce ω-square-type radiation for frequencies below fp = 1/τmax ω3 higher frequencies. We...
The complexity of coseismic slip distributions influences the tsunami hazard posed by local and, to a certain extent, distant sources. Large concentrated in shallow patches was observed recent tsunamigenic earthquakes, possibly due dynamic amplification near free surface, variable frictional conditions or other factors. We propose method for incorporating enhanced subduction earthquakes while preventing systematic excess at depths over one more seismic cycles. uses classic k−2 stochastic...
The 2011 Tohoku earthquake produced an unexpected large amount of shallow slip greatly contributing to the ensuing tsunami. How frequent are such events? can they be efficiently modelled for tsunami hazard? Stochastic models, which computed rapidly, used explore natural variability; however, generally do not deal specifically with features. We study systematic depth-dependence along a thrust fault number 2D dynamic simulations using stochastic shear stress distributions and geometry based on...
A multi-2-D non linear traveltime tomography of the shallow (3–4 km deep) structure Mt Vesuvius volcano was performed. Data have been collected during two recent active seismic experiments using a total 17 on-land shots and about 140 three-component digital seismographs. newly developed technique for imaging velocity has applied, based on an adaptive model space investigation where number grid nodes is progressively increased (multi-scale approach). The optimal parametrization chosen...
SUMMARY On 24 August 2016 at 01:36 UTC a ML6.0 earthquake struck several villages in central Italy, among which Accumoli, Amatrice and Arquata del Tronto. The was recorded by about 350 seismic stations, causing 299 fatalities damage with macroseismic intensities up to 11. maximum acceleration observed station (AMT) reaching 916 cm s–2 on E–W component, epicentral distance of 15 km Joyner Boore the fault surface (RJB) less than kilometre. Motivated high levels ground motion damage, we...
<p>We used High-Rate sampling Global Positioning System (HRGPS) data from 52 permanent stations to retrieve the coseismic dynamic displacements related 2016 August 24 <em>M<sub>w</sub></em> 6.0 Amatrice earthquake. The HRGPS position time series (named hereinafter "GPSgrams") were obtained with two different analysis strategies of raw GPS measurements (Precise Point [PPP] and Double-Difference [DD] positioning approaches using Gipsy-Oasis II TRACK (GAMIT/GLOBK)...
Abstract The city of Istanbul is characterized by one the highest levels seismic risk in Mediterranean region. An important source such increased high probability large earthquake occurrence during coming years, which stands at about 65% likelihood owing to existing gap and post‐1999 stress transfer western portion North Anatolian fault zone. In this study, we simulated hybrid broadband time histories from selected earthquakes having magnitude M w >7.0 Sea Marmara within 10–20 km Istanbul,...
On May 20th, 2024, an earthquake of magnitude MD 4.4 nucleated at shallow depth (2.6 km) in the Campi Flegrei caldera (Southern Italy), a densely populated area where increase seismic activity has been observed since 2019 attributable to on-going unrest episode. While was moderate, event produced strong ground shaking with maximum peak acceleration 3.58 m s-2, and several buildings were damaged. Here, we characterize source using probabilistic joint source-propagation spectral inversion...
We have used a dense wide-angle data set to test two-step procedure for the separate inversion of first-arrival and reflection traveltimes. Data were collected in complex thrust belt environment (southern Italy) along 14-km line, with closely spaced sources (60 m) receivers (90 m). applied fully non-linear tomographic technique, specially designed image structures, over 6400 traveltimes order determine detailed velocity model. A bi-cubic spline model parametrization is used. The strategy...
Abstract Near-fault seismic recordings for recent earthquakes (Chi Chi earthquake, 1999, and Parkfield 2004) show the high spatial heterogeneity of ground motion. This variability is controlled by fault geometry, rupture complexity, also wave propagation site effects. Nowadays, number available records in near-source region still not enough to infer a robust parameterization motion retrieve multiparametric predictive equations valid at close distances from fault. The use synthetic approach...
Probabilistic seismic hazard analysis is currently the soundest basis for rational evaluation of ground-motion site-specific engineering design and assessment purposes. An increasing number building codes worldwide ac- knowledge uniform spectra as reference to determine actions on structures select input ground motions structural analysis. This case, example, in Italy where new code also requires nonlinear dynamic be selected dominating events, identified via disaggregation hazard. In...
<em>The 2016 August 24 Amatrice earthquake occurred at 03:36 local time in Central Apennines Italy with an epicentre 43.36<sup>°</sup>E, 38.76<sup>°</sup>N, Istituto Nazionale di Geofisica e Vulcanologia (INGV), few kilometers north of the city Amatrice. The ruptured a North-West (NW)–South-East (SE) oriented normal fault dipping toward South-West (SW) (Scognamiglio et al., 2016). High values peak ground acceleration (~0.45 g) were observed close to (3 stations...
A high‐resolution multi‐fold wide‐angle seismic survey carried out across the Irpinia fault, Southern Italy, yields new information about shallow structure of this normal fault that was reactivated in 1980. The zone is imaged to a depth 60 m by using non‐linear tomographic technique specially designed image strongly heterogeneous media. Results confirm location as previously inferred trench excavated soft soils, and clearly delineates 30–35 step bedrock. This single indicative narrow zone,...
An extension of probabilistic seismic hazard analysis is proposed to introduce a priori information about source parameters. In particular, faulting style taken into account with theoretical corrective coefficient applied the attenuation law. The validity this correction assessed through comparison observed data, law predictions corrected and not corrected, results laws containing nature maintained, introducing classical formulation 2D probability density function describing most probable...
Abstract In the present study, we improve probabilistic seismic‐hazard assessment (PSHA), taking into account fault rupture‐related parameters that sensibly affect azimuthal variability of ground motion. The study area is Marmara region (Turkey), characterized by one highest levels seismic risk in Europe and Mediterranean region. hazard city Istanbul mainly associated with two active segments having well‐defined geometry, focal mechanism, rate activity. Deterministic dynamic models are also...
In recent years, the possibility to use underwater telecommunication cables perform scientific measurements has been investigated, either by inserting custom instrumentation in optical repeaters [1] or using fibers present as a sensor [2,3]. this work we will focus on SOP (State Of Polarization) technique. Change SOP, transmitted through cable, originates when intrinsic externally induced birefringence fiber results different phase velocity for polarization states.&#160;Measurements of...
We present a broadband kinematic model based on self-similar k-square distribution of the coseismic slip, with an instantaneous rise-time and constant rupture velocity. The phase slip spectrum at high wave number is random. This generates ?-squared body-wave radiation, particular directivity factor C2d scaling amplitude spectra, where Cd standard factor. Considering source models propagating pulse finite rise-time, we assume that within slipping band, has some random character, small scale...