Please use this identifier to cite or link to this item: http://hdl.handle.net/2122/9415
AuthorsChini, M.* 
Albano, M.* 
Saroli, M.* 
Pulvirenti, L.* 
Moro, M.* 
Bignami, C.* 
Falcucci, E.* 
Gori, S.* 
Modoni, G.* 
Pierdicca, N.* 
Stramondo, S.* 
TitleCoseismic liquefaction phenomenon analysis by COSMO-SkyMed : 2012 Emilia ( Italy ) earthquake
Issue Date2015
Series/Report no./39 (2015)
DOI10.1016/j.jag.2015.02.008
URIhttp://hdl.handle.net/2122/9415
Keywordsliquefaction, change detection, intensity correlation DInSAR
Subject Classification04. Solid Earth::04.06. Seismology::04.06.04. Ground motion 
AbstractThe 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:Papers Published / Papers in press

Show full item record

Page view(s)

73
Last Week
0
Last month
checked on Jun 26, 2017

Download(s)

24
checked on Jun 26, 2017

Google ScholarTM

Check

Altmetric