Active source monitoring at the Wenchuan fault zone： coseismic velocity change associated with aftershock event and its implication-中国期刊网

摘要 Withtheimprovementofseismicobservationsystem,moreandmoreobservationsindicatethatearthquakesmaycauseseismicvelocitychange.However,theamplitudeandspatialdistributionofthevelocityvariationremainsacontroversialissue.RecentactivesourcemonitoringcarriedoutadjacenttoWenchuanFaultScientificDrilling(WFSD)revealedunambiguouscoseismicvelocitychangeassociatedwithalocalMs5.5earthquake.Here,wecarryoutforwardmodelingusingtwo-dimensionalspectralelementmethodtofurtherinvestigatetheamplitudeandspatialdistributionofobservedvelocitychange.ThemodeliswellconstrainedbyresultsfromseismicreflectionandWFSDcoring.Ourmodelstronglysuggeststhattheobservedcoseismicvelocitychangeislocalizedwithinthefaultzonewithwidthof*120mratherthandynamicstronggroundshaking.Andavelocitydecreaseof*2.0%withinthefaultzoneisrequiredtofittheobservedtraveltimedelaydistribution,whichcoincideswithrockmechanicalexperimentandtheoreticalmodeling.

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Active source monitoring at the Wenchuan fault zone： coseismic velocity change associated with aftershock event and its implication

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Active source monitoring at the Wenchuan fault zone： coseismic velocity change associated with aftershock event and its implication

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