简介：Accordingtotheconceptofthefaultmotioncoordinationratio(FCR),thispaperdiscussestheeffectofthestartingpointontheresultofFCRcalculationandputsforwardthecalculationmethodforFCRusingtheslidingwindowandtheindexforevaluatingthedispersion.EarthquakecasesanalysisshowsthatattheLijiangsiteacrossthefault:theFCRvaluevariedgreatlyanditsdistributionwasdispersivebeforetheMS7.0Lijiangearthquake,whilethevaluewasstableandlessdispersiveaftertheearthquake,whichreflectsthestrainaccumulationofthefaultduringtheseismogenicprocessandthepoormovementcoordinationbetweenthemotionofthethreecomponents.Aftertheearthquake,thefaultwasinafreeactivitystate,theaccumulatedstrainenergyreleased,andthemovementofthethreecomponentswascoordinatedmutually.Atpresent,FCRdispersionofLijiangisatalowvalue,andfaultstrainaccumulationisatalowlevel.

简介：Basedontheprincipleformulaforthefour-componentstrainmeters,wecandirectlyobtainthespecificplanestrain,shearstrainandazimuthalangleoftheprincipalstrain,andthemaximumandminimumprincipalstrainscalculatedafterwardsaretheindirectresult.TheproblemsofpracticalityofthesensitivitycoefficientsAandBofplanestrainandshearstrainarethendiscussed.Basedonthisidea,weanalyzedtheobservationdataofseveralfourcomponentboreholestrainmetersneartheepicenteroftheYiliangMS5.7earthquakein2012andtheLudianMS6.5earthquakein2014intheZhaotongarea,YunnanProvince.Theresultsshowthattheanalysisbasedontheperspectiveofplanestrainandshearstrainhasanobviouslybettereffectthanthatbasedonthecomponentreadings,andcandirectlypeelofftherespectiveabnormalityoftheplanestrainandshearstrain.Inaddition,thecorrelationcoefficientcurvesbetweenmeasureddataoftwoplanestrainsshowsignificantanomalieswhichoftenoccurseveraldaysbeforeandduringtheearthquake.