简介：Inordertostudythecharacteristicsofcrustaldeformationaroundtheepicenterbeforethe2016M_S6.4Menyuanearthquake,theGPScontinuousstationsoftheperiodfrom2010to2016wereselectedaccordingtotheobservationdataofthetectonicenvironmentmonitoringnetworkinChineseMainland.Thedeformationcharacteristicsofthecrustbeforetheearthquakewerediscussedthroughinter-stationbaselinetimeseriesanalysisandthestraintimeseriesanalysisintheepicentralregion.Theresultsshowthatatrendturnofthebaselinemovementstatearoundtheepicenterregionoccurredafter2014,andthemovementafter2014reflectsanobviousdecreasingtrendofcompressionaldeformation.Duringthisperiod,thestressfieldenergywasinacertainaccumulationstate.Sincethebeginningof2014,theEW-componentlinearstrainandsurfacestrainrateweakenedgraduallybeforetheearthquake.Itshowsthattherewasanobviousdeformationdeficitattheepicentralareainthepasttwoyears,whichindicatesthattheregionaccumulatedahighdegreeofstrainenergybeforetheearthquake.Therefore,therewasasignificantbackgroundchangeintheareabeforetheearthquake.Theresultsofthestudycanprovidebasicresearchdataforunderstandingtheseismogenicprocessandmechanismofthisearthquake.
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