Research on the Source Parameters and Correlation Coefficients of Focal Mechanisms for the Yingjiang Earthquake Sequences in 2008-中国期刊网

摘要 ThesourceparametersoftheYingjiangearthquakesequencesin2008areobtainedbyapplyingspectralanalysisandBrunessourcemodel,basedonthedigitalwaveformdatarecordedbytheYunnanDigitalSeismicNetwork.Thecorrelationcoefficientsarecalculatedusingthelow-frequencyspectralamplitudesof2eventsrecordedbyasamestation,then,eventswithsimilarfocalmechanismaregroupedusingtheclusteringanalysismethod.Comparedtotheobtainedfocalmechanisms,itisfoundthattherearegoodcorrelationswiththeazimuthofPaxesineachclusteringgroup,andthelargerthecorrelationcoefficient,theclosertheazimuthsofPaxes.WedividetheYingjiangareainto3regionstoanalyzethestresslevelandstressdirectionbycombiningthesourceparametersandthemeanfocalmechanismofeachgroup.Theresultsshow:Thechangeandtransformationofthefocalmechanismtypesatdifferentstagescanrepresentthetemporalcharacteristicsoftheregionalstressfield.Iftheearthquakefocalmechanismtypesareconcentratedinatimeperiodandswitchtothedirectionofregionalstressfield,itmaybeasignofstrongearthquake.Thereissomerelationshipbetweenthestressdropandthetypeoffocalmechanism.Thoseearthquakeswithstressfieldsrevealedbyfocalmechanismtypesclosertotheregionaltectonicstressfieldwillhavehigherstressdrop,whilethosewiththefocalmechanism-revealedstressfieldsdifferingalotfromtheregionaltectonicstressfieldwillgenerallyhavealowerstressdrop.

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Research on the Source Parameters and Correlation Coefficients of Focal Mechanisms for the Yingjiang Earthquake Sequences in 2008

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Research on the Source Parameters and Correlation Coefficients of Focal Mechanisms for the Yingjiang Earthquake Sequences in 2008

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