简介：AnM=6.0earthquakeoccurredonFebruary23,2001inthewesternSichuanProvince,China.Themacroseismicepicentersituatedinthehighmountain-narrowvalleyregionbetweenYajiangandKangdingcounties.Accordingtofieldinvestigationintheregion,theintensityofepicentralareareachedVIIIandtheareaswithintensityVIII,VIIandVIare180km2,1472km2and3998km2,respectively.TheisoseismalsaregenerallyinellipticshapewithmajoraxistrendingnearN-Sdirection.TheearthquakedestroyedmanybuildingsandproducedsomephenomenaofgroundfailureandmountainousdisastersintheareawithintensityVIII.Thiseventmayberesultedfromlong-termactivitiesoftheLitangfaultandYunongxifault,twomainfaultsinthewesternSichuan.Themovementsbetweenthemainfaultsmadethecruststressadjustedandconcentrated,andfinallytheearthquakeonasecondaryfaultintheblockreleasedaquitelargeenergy.