A5058826327- Seismology and Earthquake Studies
- Seismic Waves and Analysis
- earthquake and tectonic studies
- Earthquake Detection and Analysis
- Seismic Imaging and Inversion Techniques
- Seismic Performance and Analysis
- Structural Health Monitoring Techniques
- High-pressure geophysics and materials
- Landslides and related hazards
- Geophysical Methods and Applications
- Anomaly Detection Techniques and Applications
- Spreadsheets and End-User Computing
- Distributed and Parallel Computing Systems
- Service-Oriented Architecture and Web Services
- Geophysics and Sensor Technology
- Usability and User Interface Design
- Geological and Geophysical Studies
- Peer-to-Peer Network Technologies
- Scientific Computing and Data Management
- Context-Aware Activity Recognition Systems
- Geological and Geochemical Analysis
- Geological Modeling and Analysis
- Varied Academic Research Topics
- Recommender Systems and Techniques
- Geochemistry and Geologic Mapping
National Institute of Oceanography and Applied Geophysics
2023-2025
University of Naples Federico II
2015-2024
Federico II University Hospital
2018-2023
Research Institute for Geo-Hydrological Protection
2023
Stanford University
2022
Istituto Nazionale di Geofisica e Vulcanologia
2022
Analysis and Monitoring of Environmental Risk
2018
Politecnico di Milano
2010-2015
GFZ Helmholtz Centre for Geosciences
2007-2013
University of Potsdam
2011
ABSTRACT We present initial findings from the ongoing Community Stress Drop Validation Study to compare spectral stress-drop estimates for earthquakes in 2019 Ridgecrest, California, sequence. This study uses a unified dataset independently estimate earthquake source parameters through various methods. drop, which denotes change average shear stress along fault during rupture, is critical parameter science, impacting ground motion, rupture simulation, and physics. Spectral drop commonly...
Seismic noise contains information on the local S‐wave velocity structure, which can be obtained from phase dispersion curve by means of array measurements. The H/V ratio single stations also average and total thickness sedimentary cover. A joint inversion two data sets therefore might allow constraining final model well. We propose a scheme that does not require starting because usage genetic algorithm. Furthermore, we tested suitable cost functions for our set, using a‐priori driven...
To study the applicability of passive seismic interferometry technique to near-surface geological studies, noise recordings from a small scale 2-D array stations were performed in test site Nauen (Germany). Rayleigh wave Green's functions estimated for different frequencies. A tomographic inversion traveltimes each frequency is then performed, allowing laterally varying 3-D surface velocity structure below be retrieved at engineering–geotechnical scales. Furthermore, S-wave cross-section...
Abstract We propose a new real‐time approach to detect, locate, and estimate the volume of rockslides by analyzing waveforms acquired from broadband regional seismic networks. The identification signals generated other sources, such as natural and/or induced earthquakes, is accomplished exploiting ratio between local magnitudes ( M L ) duration D ). found that associated with have / < 0.8, while for earthquakes ≅ 1. In addition, we derived an empirical relationship rockslide volumes,...
Abstract As part of the community stress-drop validation study, we evaluate uncertainties seismic moment M0 and corner frequency fc for earthquakes 2019 Ridgecrest sequence. Source spectra were obtained in companion article by applying spectral decomposition approach with alternative processing model assumptions. The objective present study is twofold: first, to quantify impact different assumptions on source parameters; second, use distribution values estimate an epistemic contribution...
A joint inversion of phase velocity and H/V ratio curves, both obtained from seismic‐noise recordings, permits the retrieval shear‐wave structure local sedimentary cover. Our scheme uses a genetic algorithm considers influence higher modes on data sets. Encouraged by results published previously (Parolai et al., 2005) we went one step further. We found, using synthetic set, that impedance contrast at sediment‐bedrock interface has strong shape curve, which therefore allows bedrock S‐wave to...
Abstract Environmental noise measurements and borehole data were used for a preliminary seismic characterization of the Plio-Quaternary sedimentary basin underlying city Florence (Italy). An extensive survey ambient vibrations was conducted by using horizontal-to-vertical (H/V) spectral ratio technique (HVSR) to map fundamental resonance frequency cover. In order use this information infer main features subsurface geometry, an estimate S -wave velocity profile in sediment layer obtained from...
The joint inversion of Rayleigh wave dispersion and H/V curves from environmental noise measurements allows the retrieval S-wave velocity profiles for shallow subsoil. For this purpose, genetic linearized algorithm have been combined in a two-step procedure, that principal drawbacks typical application each separately to be overcome. In first step, procedure is used constrain subvolume parameter space where absolute minimum misfit function located. second algorithm, having as an initial...
Research Article| September 01, 2009 The Self-organizing Seismic Early Warning Information Network (SOSEWIN) K. Fleming; Fleming Helmholtz-Zentrum Potsdam Deutsches GeoForschungsZentrum Telegrafenberg 14473, Potsdam, Germany picoz@gfz-potsdam.de (M. P.) 1Helmholtz-Zentrum GeoForschungsZentrum, 4Department of Spatial Sciences, Curtin University Technology, Perth, Western Australia, Australia Search for other works by this author on: GSW Google Scholar M. Picozzi; Picozzi C. Milkereit;...
Abstract In this work the scaling of seismic moment (M 0 ) and radiated energy (E r is investigated for almost 800 earthquakes 2016–17 Amatrice-Norcia sequences in Italy, ranging magnitude w from 2.5 to 6.5. The analysis M -to-E highlights a breaking source self-similarity, with higher stress drops larger events. Our results show limitation using , turn capture variability high frequency ground motion. Since observed seismicity does not agree assumptions on drop definition we exploit...
Abstract As part of the community stress-drop validation study initiative, we apply a spectral decomposition approach to isolate source spectra 556 events occurred during 2019 Ridgecrest sequence (Southern California). We perform multiple decompositions by introducing alternative choices for some processing and model assumptions, namely: three different S-wave window durations (i.e., 5 s, 20 variable between s); two attenuation models that account differently depth dependencies; site...
This study is focused on fluids characterization and circulations through the crust of Irpinia region, an active seismic zone in Southern Italy, that has experienced several high-magnitude earthquakes, including a catastrophic one 1980 (M = 6.9 Ms). Using isotopic geochemistry carbon‑helium system free dissolved volatiles water, this aims to explore processes at depth can alter pristine chemistry these natural fluids. Gas-rock-water interactions their impact CO2 emissions composition are...
We determined a high-resolution 3-D S-wave velocity model for 26 km × 12 area in the northern part of basin Santiago de Chile. To reach this goal, we used microtremor recordings at 125 sites deriving horizontal-to-vertical (H/V) spectral ratios that inverted to retrieve local profiles. In inversion procedure, additional geological and geophysical constraints values thickness sedimentary cover already by gravimetric measurements, which were found vary substantially over short distances...
Abstract When accompanied by appropriate training and preparedness of a population, Earthquake Early Warning Systems (EEWS) are effective viable tools for the real‐time reduction societal exposure to seismic events in metropolitan areas. The Italian Accelerometric Network, RAN, which consists about 500 stations installed over all active zones, as well many cities strategic infrastructures Italy, has potential serve nationwide early warning system. In this work, we present feasibility study...
Abstract An earthquake early warning (EEW) system is a real‐time seismic monitoring infrastructure that has the capability to provide warnings target cities before arrival of strongest shaking waves. In order rapid alert when targets are very close epicenter events, we developed an on‐site EEW approach and evaluated its performance at Italian national scale. The P wave‐based method measures in real time two parameters: initial peak displacement ( Pd ) average period τ c ). As output,...
Abstract Deep fluids play active roles during the preparatory phases of large earthquakes and, through their chemical signature, carry information about deep processes within seismogenic crust. Due to its inertness and isotopic helium (the lightest noble gas) is a useful tracer for investigating storage transfer crust, including those prior hazardous earthquakes. Here we analyse 12-year earthquake catalogue from Irpinia Fault Zone, Italy, compute 4 He outputs seismogenetic fault zones (from...
3-D shear wave velocity images are of particular interest for engineering seismology. To obtain information about the local subsoil structure, we present a one-step inversion procedure based on computation high-frequency correlation functions between stations small-scale array deployed recording ambient seismic noise. The calculation Rayleigh phase velocities is frequency-domain SPatial AutoCorrelation technique. Constitutively, tomographic traveltimes estimated each frequency performed,...
Research Article| November 22, 2017 Performance of Earthquake Early Warning Systems during the 2016–2017 Mw 5–6.5 Central Italy Sequence Gaetano Festa; Festa aDipartimento di Fisica Ettore Pancini, Università Napoli Federico II, Complesso Univ. Monte S. Angelo, via Cinthia, 80126 Naples, Italy, gaetano.festa@unina.it Search for other works by this author on: GSW Google Scholar Matteo Picozzi; Picozzi Alessandro Caruso; Caruso Simona Colombelli; Colombelli Marco Cattaneo; Cattaneo bIstituto...