简介：Itisproposedthatsomepossiblemacroseismicepicenterscanbedeterminedquicklyfromtherelationshipthatthemicroseismicepicenterslocatedbyinstrumentsbearwithfaults.Basedontheseso-calledmacroseismicepicenters,wecanmakefastseismichazardestimationafterashockbyuseoftheempiricaldistributionmodelofseismicintensity.Incomparisonwiththemethodthatusesthemicroseismicepicentersdirectly,thisapproachcanincreasetheprecisionoffastseismichazardestimation.Statisticalanalysisof133mainearthquakesinChinawasmade.Theresultshowsthatthedeviationdistancebetweenthemicroseismicepicenterandmacroseismicepicenterfallswithintherangeof35kmfor88%earthquakesofthetotalandwithintherangeof35to75kmfortheremainingones.Then,wecantaketheareathathasthemicroseismicepicenterasitscenterandis35kminradiusastheareaforemphaticanalysis,andtaketheareawithin75kmaroundthemicroseismicepicenterastheareaforgeneralanalysis.Therelationbetweenthe66earthquakecasesontheN-SSeismicBeltinChinaandthespatialdistributioncharacteristicsoffaultsandtheresultsoffocalmechanismsolutionwereanalyzedindetail.Weknowfromtheanalysisthattheerrorofinstrumentalepicenterdeterminationisnottheonlyfactorthatgiveseffectstothedeviationofthemacroseismicepicenter.Inadditiontoit,thefaultsize,faultdistribution,faultactivity,faultintersectiontypes,earthquakemagnitude,etc.arealsomainaffectingfactors.Bysortingout,processingandanalyzingtheseaffectingfactors,theprincipleandproceduresforquicklydeterminingthepossiblepositionofthemacroseismicepicenterweresetup.Takingtheseasabasisandestablishinganationwidedatabaseoffaultsthatcontainsrelevantfactors,itispossibletoapplythismethodinpracticalfastestimationofseismichazard.