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1、Vol.46No.4SCIENCEINCHINA(SeriesD)April2003BasiccharacteristicsofactivetectonicsofChinaDENGQidong(邓起东),ZHANGPeizhen(张培震),RANYongkang(冉勇康),YANGXiaoping(杨晓平),MINWei(闵伟)&CHUQuanzhi(楚全芝)InstituteofGeology,ChinaSeismologicalBureau,Beijing100029,ChinaCorrespondenceshouldbeaddresse
2、dtoDengQidong(email:qddeng@yahoo.com.cn)ReceivedNovember14,2002AbstractDuringthelast20years,studiesonactivetectonicsinChinahaveenteredanewquan-titativeresearchstageandmadeagreatprogress.Summingupthequantitativeresults,aMapofActiveTectonicsofChinaonthescaleof1︰4millionhasbee
3、ncompiled.Inthemapalltypesofactivetectonicsandtheirkinematicparametersarereflectedinpossibledetail,suchasactivefaults,activefolds,activebasins,activeblocks,volcanoes,andearthquakes.Thispapersumma-rizesthebasiccharacteristicsofactivetectonicsofChina.TheHimalayaMountainsandTa
4、iwanIslandaremajorplateboundarieswheretheslipratesarelargerthan15mm/a.Tectonicactivityinthecontinentalintraplateregionischaracterizedbyblockmotion.Thecrustandlithosphereintheregionweredissectedintoblockswithdifferentorders.OfthemtheQinghai-Xizang(Tibet),Xin-jiang,andNorthCh
5、inablockregionsexhibitthemostrecenttectonicactivity.Thekinematicchar-acteristicsofmorethan200activetectoniczonesindicatethattheintraplatetectonicactivityrepresentsablockmotionatalimitedlowrate.Horizontalslipratealongthetectonicboundarybeltsbetweentheblocksisgenerallylesstha
6、n10mm/a,and10—15mm/ainmaximum,andhenceitdoesnotsupportthecontinentalescapetheoryofhighrateofslip.Keywords:activetectonics,faultblock,faultblockregion,blockmotion,sliprate.ActivetectonicsisinferredtoallthestructureswhichhavebeenactivesincethelatePleisto-cene,100—120kaB.P.,ar
7、estillactiverecently,andwillbeactiveinacertaintimeperiodinthefuture,suchasactivefaults,activefolds,activebasins,activevolcanoes,andthecrustal-litho-[1,2]sphericblocksconfinedbythem.Forthesakeofearthquakedisasterresearchandprevention,safetyofengineeringprojectsandurbanfacili
8、ties,andrecentgeodynamicresearch,activetectonicshasbeensignificantlystudiedsinceth
