Some evidences for earthquake occurrence in the shallow crust in some areas of North China and Southwest China-中国期刊网

摘要 Theparametersofhypocentrallocationareimportantfundamentaldataforthestudyofseismologyandtheearthinteriorphysics;amongthem,thefocaldepthisaveryimportantonebutcanhardlybemeasuredwithhigherprecision.Withtheincreaseofseismicstationsinnumber,theheighteningofobservationqualityandtheimprovementofdeterminationmethod,suchasituationhasbeenchangedmuch.Inthispaper,theresultsofhypocentrallocationandre-locationby7small-aperturedigitalseismicstationnetworksatTangshan,ZhangbeiandHuailaiofHebeiProvince,DatongofShanxiProvinceandJianchuan,LuquanandYao＇anofYunnanProvinceareused.Usingtheseresultstogetherwiththoseoffocaldepthinversionbyfar-fielddataofsomeindividuallargeshocksincorrespondingareasandthosere-determinedbytheLinfentelemeteredseismicnetworkofShanxiProvince,acomparisonwiththeresultsoffocaldepthdeterminationinthepastearthquakecataloguesismade.Itisfoundoutthatthefocaldepthsdeterminedbythesmall-apertureseismicnetworksarebasicallydistributedintherangefromtheearthsurfacetoten-oddkilometersunderground.Incontrast,thefocaldepthsdeterminedinthepastaremostlydistributedatthedepthrangefromtheearthsurfaceto30kmunderground.Besides,thereisadifferenceof50%to100%betweentheaveragevaluesofthetwocases,whichisquiteanobviousone.Fromtheresultofanalysis,itisconsideredthattheresultsdeterminedbythesmall-apertureseismicnetworksmaybeclosertotherealityoffocaldepthsdistribution.Thatistosay,earthquakesintheabove-mentionedareasshouldbedistributedintheshallowpartofthecrust.Thecausesthatleadtotheabovesituationarediscussedpreliminarily,andsomesuggestionsandmeasuresforimprovingtheprecisionoffocaldepthdeterminationareputforward.

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Some evidences for earthquake occurrence in the shallow crust in some areas of North China and Southwest China

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Some evidences for earthquake occurrence in the shallow crust in some areas of North China and Southwest China

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