EARTHQUAKE FOCAL MECHANISM AND ITS TECTONIC SIGNIFICANCE ALONG THE TWO SIDES OF THE RED RIVER FAULT ZONE-中国期刊网

摘要 TheRedRiverFaultZoneisagiganticslide-slipfaultzoneextendingupto1000kmfromTibettoSouthChinaSea.Ithasbeendividedintothenorth,centralandsouthsegmentsaccordingtothedifferenceofthegeometry,kinetics,andseismicityontheland,butaccordingtothecontactedrelationshipbetweentheoldpre-CenozoicblockinIndochinaPeninsulaandtheSouthChinablock,theRedRiverFaultZonewasdividedintotwopartsextendingfromlandtoocean,thenorthandsouthsegments.SincetheTertiary,theRedRiverFaultZonesufferedfirstthesinistralmovementandthenthedextralmovement.Theactivitiesofthenorthandthesouthsegmentsweredifferent.Basedontheanalysisofearthquakesandfocalmechanismsolutions,earthquakeswiththefocusdepthsof0-33kmaredistributedoverthewholeregionandmoredeepearthquakesaredistributedonthenortheasternsidesoftheRedRiverfault.Typesoffaultingactivitiesarethethrustinthenorthwest,thenormalinthenorthandthestrike-slipinthesouth,withtheoddtype,viz.thetransitiontype,intheotherregion.TheseshowtheRedRiverFaultZoneanditsadjacentregionsufferedtheextrudingforceinNNWdirectionandthenormalstressinNEEdirectionanditmakesthefaultintheregionextrude-thrust,horizontalstrike-slipandextensionalnormalmovement.

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EARTHQUAKE FOCAL MECHANISM AND ITS TECTONIC SIGNIFICANCE ALONG THE TWO SIDES OF THE RED RIVER FAULT ZONE

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EARTHQUAKE FOCAL MECHANISM AND ITS TECTONIC SIGNIFICANCE ALONG THE TWO SIDES OF THE RED RIVER FAULT ZONE

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