0000000000126285

AUTHOR

Giorgio Mangano

showing 4 related works from this author

Waveforms clustering and single-station location of microearthquake multiplets recorded in the northern Sicilian offshore region

2013

In 2009 December, the OBSLab-INGV (Istituto Nazionale di Geofisica e Vulcanologia) deployed an Ocean Bottom Seismometer with Hydrophone (OBS/H) near the epicentral area of the main shock of the Palermo seismic sequence of 2002. The monitoring activity had a total duration of about 8 months. During this experiment, the OBS/H recorded 247 very local microearthquakes, whose local magnitude is between -0.5 and 2.5 and TS - TP delay time between 0.2 and 5 s, almost all ofwhichwere undetected by the Italian National Seismic Network. This local microseismicity has been analysed using an innovative clustering technique that exploits the similarity between the waveforms generated by different events…

Earthquake source observationSettore GEO/10 - Geofisica Della Terra SolidaSingle stationlanguage.human_languageComputational seismologySeismicity and tectonicGeophysicsGeochemistry and PetrologylanguageWaveformSubmarine tectonics and volcanismSubmarine pipelineSeismic monitoring and test-ban treaty verificationMicroearthquakeCluster analysisSicilianGeologySeismologyComputational seismologyGeophysical Journal International
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Simultaneous seismic wave clustering and registration

2012

In this paper we introduce a simple procedure to identify clusters of multivariate waveforms based on a simultaneous assignation and alignment procedure. This approach is aimed at the identification of clusters of earthquakes, assuming that similarities between seismic events with respect to hypocentral parameters and focal mechanism correspond to similarities between waveforms of events. Therefore we define a distance measure between seismic curves in R^d d>=1, in order to interpret and better understand the main features of the generating seismic process.

Focal mechanismMultivariate statisticsComputer sciencebusiness.industryFunctional clusteringCurve registration Waveform Palermo aftershocks sequenceProcess (computing)Pattern recognitionMeasure (mathematics)Seismic wavePhysics::GeophysicsIdentification (information)WaveformArtificial intelligenceComputers in Earth SciencesCluster analysisbusinessSettore SECS-S/01 - StatisticaSeismologyInformation Systems
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The INGV's new OBS/H: Analysis of the signals recorded at the Marsili submarine volcano

2009

Abstract The ocean bottom seismometer with hydrophone deployed on the flat top of the Marsili submarine volcano (790 m deep) by the Gibilmanna OBS Lab (CNT–INGV) from 12th to 21st July, 2006, recorded more than 1000 transient seismic signals. Nineteen of these signals were associated with tectonic earthquakes: 1 teleseismic, 8 regional (located by INGV) and 10 small local seismic events (non located earthquakes). The regional events were used to determine sensor orientation. By comparing the signals recorded with typical volcanic seismic activity, we were able to group all the other signals into three categories: 817 volcano–tectonic type B (VT-B) events, 159 occurrences of high frequency t…

Seismometergeographygeography.geographical_feature_categoryHydrophoneContinuous volcanic tremorFrequency bandPolarization analysiSpectral analysisMarsili SeamountTransient volcano–seismic signalSignalTectonicsGeophysicsVolcanoGeochemistry and PetrologyOBS/HTime domainSubmarine volcanoGeologySeismologyJournal of Volcanology and Geothermal Research
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Seismic Network Evaluation through Simulation: An Application to the Italian National Seismic Network

2011

Abstract A properly organized seismic network is a valuable tool for monitoring seismic zones and assessing seismic hazards. In this paper we propose a new method (seismic network evaluation through simulation, SNES) to evaluate the performance of hypocenter location of a seismic network. The SNES method gives, as a function of magnitude, hypocentral depth, and confidence level, the spatial distribution of the number of active stations in the location procedure and their relative azimuthal gaps, along with confidence intervals in hypocentral parameters. The application of the SNES method also permits evaluation of the magnitude of completeness ( M C ), the background noise levels at the sta…

HypocenterSettore GEO/10 - Geofisica Della Terra Solidaseismic network localization errorMagnitude (mathematics)Seismic noiseInduced seismicityBackground noisePlate tectonicsGeophysicsGeochemistry and PetrologyLithosphereEpicenterSeismologyGeologyBulletin of the Seismological Society of America
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