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ONPRESENTACTIVITYCHARACTERISTICS OFXIANSHUIHEFAULTZONE |
YangYonglin1,2;SuQin2 |
1)ChenduUniversityofTechnology,Chengdu 610059 2)SurveyEngineeringInstituteofEarthquakeAdministrationofSichuanProvince,Yaan 625000 |
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Abstract AlongthefaultsofXianshuiheseveralfaultcrossingmeasurementsitesweresetupandtheobservationshasbeencarriedoutformorethan20years,Combiningwiththespatialtemporalseismicfractureinformation alongthefaults,thepresenttectonicactivitycharacteristicsinthedifferensegmentsofthefaultarecomparedwith eachother.Itshowsthatthedifferentsegmentsofthefaultpresentthedifferentactivecharacteristics.Thenorth westernsegmentofthefaultisofleftlateralstrikeslip,themiddlesegmentisofleftlateralstrikeslipwiththe tendencyofreversefaultandthenortheasternsegmentisofleftlateralstrikeslipwiththetendencyofnormalfault. Alltheactiveamountsofeverysegmentsdecreasewiththetimeandthesecharacteristicsimplythatthefaultzone hereisgettinglocked.
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Key words:
Xianshuihefaultzone
faultcrossingdeformationmeasurement
segmentedfeatureoffaultactivity
strain accumulation
dangerousareaofstrongearthquake
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Received: 01 January 1900
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Corresponding Authors:
YangYongl
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