1993 TheRelationshipBetweenTheEarthquakeMagnitudeAndTheAreaof EarthquakeIntensity,TheDepthOfEarthquakeOriginInSichuan YuGuozheng (Se/~rnologiealofffig~.fChongqingCity) Ahstraet Accordingtoseismogeologicalfebionandthinkinsaboutthespacedistributionfeatureofthe earthquakemorethan—magnitude7,wedividetheareaofSichuanintothreebelts—the Xianshuihe,theSongpan--LongmenmountainandtheMabian inthispaper-Weanalysedthedataof33earthquakessinceI900thatincludetheinstrumentdetemmingparametersand macrointensitysurveyVarameters-Wemadeastatisticanalysisandfitmanygroupsrelation formulabetweentheearthquakemagnitudeandtheareaofdifferentintensityregion,theinten Jty value´thedepthofearthquakeori inwiththeanalysismethodofmultivariatelinearregression.Thegeneralformulltisz =+k/—+l0g Allcorrelationcoefficientsareabout0-90+Wet~tedsomeearthquakeswithaboveformula. testingresultshowsthattheerrorfortheearthquakemagnitudeisusuallylessthan0.3andthe errorofthedepthofearthquakeoriginisusuallylessthean5kilometer.Wetestedthehis0rieal earthquakesoccurredbefore1900withtherelationformulaobtainedbyus.Therearem0retha 3isoseismalcurve~iintheea~hquakeare,8~-Thetestingresultsarealsoratisfactory.KeyWords~earthqtmkemagnitude~arPMIofintensityregiontdeptbofearthquakeorigin+