Coseismic vertical deformation of the Ms8.0 Wenchuan earthquake from repeated levelings and its constraint on listric fault geometry-中国期刊网

摘要 ThedevastatingMS8.0WenchuanearthquakerupturedtwolargeparallelthrustfaultsalongthemiddlesegmentoftheLongmenshanthrustbelt.PreseismicandpostseismiclevelingdataindicatedthehangingwalloftheYingxiuBeichuan-NanbathrustfaultmainlypresentedcoseismicupliftwithrespecttothereferencepointatPingwucountytown,andtheobservedmaximumupliftof4.7mislocatedatBeichuancounty(Qushantown)whichisabout100mwestofthefaultscarp.ThefootwalloftheYingxiu-Beichuan-Nanbathrustfaultmainlyshowedsubsidencewithmaximumsubsidenceof0.6mneartherupture.Byemployingalistricdislocationmodel,wefoundthatthefaultgeometrymodelofexponentialdipangleδ=88°×[1-exp(-9/h)]withdepthof18kmanduniformthrust-slipof5.6mcouldfittheobservedcoseismicverticaldeformationverywell,whichverifiesthelistricthrustmodeloftheLongmenshanorogeniczone.

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Coseismic vertical deformation of the Ms8.0 Wenchuan earthquake from repeated levelings and its constraint on listric fault geometry

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Coseismic vertical deformation of the Ms8.0 Wenchuan earthquake from repeated levelings and its constraint on listric fault geometry

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