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Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9415

Authors: Chini, M.*
Albano, M.*
Saroli, M.*
Pulvirenti, L.*
Moro, M.*
Bignami, C.*
Falcucci, E.*
Gori, S.*
Modoni, G.*
Pierdicca, N.*
Stramondo, S.*
Title: Coseismic liquefaction phenomenon analysis by COSMO-SkyMed : 2012 Emilia ( Italy ) earthquake
Title of journal: International Journal of Applied Earth Observation and Geoinformation
Series/Report no.: /39 (2015)
Publisher: Elsevier Science
Issue Date: 2015
DOI: 10.1016/j.jag.2015.02.008
Keywords: liquefaction, change detection, intensity correlation DInSAR
Abstract: The liquefaction phenomenon that occurred in the coseismic phase of th eMay 20,2012 Emilia(Italy) earthquake (ML5.9) is investigated. It was induced by the water pressure increase in the buried and confined sand layers.The level-ground liquefactionwastheresultofachaoticgroundoscillationcaused by theearthquakeshakingandtheobservedfailureswereduetotheupwardwaterflowcausedby the excessofporepressures.Weexploitedthecapabilityofthedifferentialsyntheticapertureradar interferometry (DInSAR)techniquetodetectsoilliquefactionsandestimatetheirsurfacedisplacements, as wellasthehighsensitivitytosurfacechangesofcomplexcoherence,SARbackscatteringandintensity correlation. Tothisaim,asetoffourCOSMO-SkyMedX-bandSARimages,coveringtheperiodApril 1–June 6,2012,wasused.Geological–geotechnicalanalysiswasalsoperformedinordertoascertainif the detectedSAR-basedsurfaceeffectscouldbeduetothecompactioninducedbyliquefactionofdeep sandy layers.Inthisregards,theresultsobtainedfrom13electricalconepenetrometertestsshowthe presence ofafinetomediumsandylayeratdepths,rangingbetween9and13m,whichprobablyliquefied during theearthquake,inducingverticaldisplacementsbetween3and16cm.Thequantitativeresults from geological–geotechnicalanalysisandthesurfacepunctualeffectsmeasuredbyDInSARareingood agreement, evenifsomedifferencesarepresent,probablyascribabletothelocalthicknessanddepth variability ofthesandylayer,ortolackofdeformationdetectionduetoDInSARdecorrelation.Theadopted approach permittedustodefinetheextentoftheareasthatunderwentliquefactionandtoquantifythe local subsidencerelatedtothesephenomena.Thelatterachievementprovidesusefulinformationthat must beconsideredinengineeringpractices,intermsofexpectedverticaldeformations.
Appears in Collections:04.06.04. Ground motion
Papers Published / Papers in press

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