Heterogeneous strain regime in the eastern margin of Tibetan Plateau and its tectonic implications-中国期刊网

摘要 TheeasternmarginofTibetanPlateauisoneofthemostactivezonesoftectonicdeformationandseismicityinChina.Tomonitorstrainbuildupandbenefitseismicriskassessment,weconstructed14survey-modeglobalpositionsystem(GPS)stationsthroughoutthenorthwestofLongmenshanfault.AnewGPSfieldover1999–2011isderivedfrommeasurementsofthenewlybuiltandpre-existingstationsinthisregion.Sequentially,twostrainratefields,oneprecedingandtheotherfollowingthe2008MW7.9Wenchuanearthquake,areobtainedusingtheGausianweightingapproach.Strainfieldover1999–2007showsdistinctstrainpartitioningpriortothe2008MW7.9Wenchuanearthquake,withcompressionspreadingoveraroundLongmenshanarea.Strainfieldderivedfromthetwomeasurementsin2009and2011showsthattheareaaroundLongmenshancontinuestobeunderstrikingcompression,asthepatternprecedingtheWenchuanearthquake,implyingacausativefactorofthesequentof2013MW6.7Lushanearthquake.OurGPSderiveddilatationshowsthatboththeWenchuanandLushanearthquakesoccurredwithinthedomainofpronouncedcontraction.TheGPSvelocitiesdemonstratethattheLongribafaultunderwentslightmotionwiththefaultnormaland-parallelratesat1.0±2.5mmand0.3±2.2mm/a;theLongmenshanfaultdisplayedslowactivity,withafault-normalrateat0.8±2.5mm/a,andafault-parallelrateat1.8±1.7mm/a.LongribafaultisonaparwithLongmenshanfaultinstrainpartitioningtoaccommodatethesoutheastwardmotionofeasternmarginoftheTibetanPlateau.Integratedanalysisofprincipalstraintensors,meanprincipalstress,andfastdirectionsofmantleanisotropyshowsthatwestofSichuanischaracterizedasmechanicallystrongcrust-mantlecoupling.更多还原

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Heterogeneous strain regime in the eastern margin of Tibetan Plateau and its tectonic implications

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Heterogeneous strain regime in the eastern margin of Tibetan Plateau and its tectonic implications

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