简介：

简介：WesimulateGPShorizontalvelocityfieldintermsofrotationsofcrustalblockstodescribedeformationbehavioroftheChinesemainlandanditsneighboringareas.31crustalblocksareboundedprimarilyby~30Quaternaryfaultswithdistinctgeometriesandvariablelong-termratesof<20mm/a,and1683GPSvelocitiesweredeterminedfromdecade-longobservationsmostlywithanaverageduncertaintyof1?2mm/a.WedefineGPSvelocityatasitebythecombinationofmotionofrigidblockandelasticstraininducedbythefaultthatislockingduringaseismiccycle.ModelvelocitiespredictedfromthepreferableblockmodelmatchwellwiththeGPSvelocitiestoanuncertaintyof~1.7mm/a.Theslipratesinferredfromthismodelisinarangeof6?18mm/aforthemajorfaultsinTibetanditsmarginsand1?4mm/aineasternChina,consistentwithgeologicalobservations.Ournumericalsimulationsuggeststhatthecrustalblocksdeforminternallyatalevelof~10×10-9/a,quitesmallincomparisonwithsignificantdeformationlocalizedalongfaultzonesof50?100kmwide.Weconcludethatthepatternofcontinentaldeformationisnotcontinuous-likebutblock-like,andthetenetofplatetectonicsmaybeapplicabletocharacterizetheactivedeformationinAsia.

简介：在这篇论文，把粗野错误(空铅)的伪精确的察觉与不连续的变丑positive分析相结合的一个新想法，向前被带划分地区性的活跃的块。方法能为与观察数据缺乏的区域改进活跃的块的分界并且提供一列新火车直为活跃的块的地区性的变丑的完全的学习。另外，把四川云南区域用作例子，方法的实践过程简短被介绍。

简介：Basedonthedatafromrepeatedpreciselevelingandacross-faultdeformationmeasurementscarriedoutinrecent30yearsandtheanalyzedresultsfromGPSobservationsmadeinrecentyearsalongthenortheasternmarginofQinghai(Xizangblock,andcombinedwiththegeologicalstructuresandseismicactivities,somecharacteristicsinregionaltectonicdeformationandstrongearthquakedevelopmentarestudiedandapproachedpreliminarily.Theresultsshowthat:a)Thespace-timedistributionofcurrenttectonicdeformationinthisareaisinhomogeneouswithrelativelyintensivetectonicdeformationinthevicinityofmainboundaryfaultsandweakdeformationinthefartherareas.Theintensityofverticaldifferentialmovementandthedeformationstatusvarywithtime,andthehorizontalmovementanddeformationarecharacterizedbyapparentcompressionandstrike-slip.b)ThetectonicstressfieldgeneratedbytheNE-trendingcontinuouscompressivemovementofQinghai(XizangblockduetothenorthwardpressandcollisionofIndiaplateistheprincipalstressforthetectonicdeformationandearthquakedevelopmentinthisarea.Theevolutionofspace-timedistributionoftectonicdeformationandseismicityiscloselyrelatedtotheblockactivityanddynamicevolutionofregionaltectonicstressfield.c)Theverticaldeformationupliftandhigh-gradientdeformationzonesandtheobviousfaultdeformationanomalyappearedalongtheboundariesoftectonicblockscanbeconsideredastheindicatorsofhinderedblockmotionandintensifiedtectonicstressfieldforstrongearthquakedevelopment.Usually,theabove-mentionedphenomenawouldbefollowedbytheseismicityofM(6.0,buttheearthquakemightnotoccurintheplacewiththemaximummovement.Thezoneswiththefaultdeformationanomalycharacterizedby(tendenciousaccumulationaccelerationturning(andthesurroundingareasmightbethepositionsforaccumulationofstrainenergyanddevelopmentandoccurrenceofstrongearthquakes.

简介：UsingpureSwavefittingmethod,westudiedtheshearwavevelocitystructuresundertheOrdosblockanditseasternandsouthernmarginalareas.TheresultsshowthatthevelocitystructurebeneathYulinstationintheinteriorofOrdosblockisrelativelystable,wherenoapparentchangebetweenhighandlowvelocitylayersexistsandtheshearwavevelocityincreasessteadilywiththedepth.Thereisa12kmthicklayeratthedepthof25kmunderthisstation,withanSwavevelocity(Vs=3.90km/s)lowerthanthatatthesamedepthinitseasternandsouthernareas(Vs≥4.00km/s).ThecrustundertheeasternmarginofOrdosblockisthickerthanthatoftheYulinstation,andthevelocitystructuresalternatebetweenthehighandIowvelocitylayers,withmorelowvelocitylayers.Ithasthesamecharacteristicashavinga10km-thicklowvelocitylayer(Vs=3.80km/s)inthelowercrustbutburiedatadepthofabout35km.Moreover,westudiedtheVi/VsratioundereachstationincombinationwiththeresultofPwavevelocityinversion.Theresultsshowthat,theaveragevelocityratiooftheYulinstationattheinteriorofOrdosblockisonly1.68,withaverylowratio(about1.60)intheuppercrustandastableratioofabout1.73inthemidandlowercrust,whichindicatesthemediaunderthisstationishomogenousandstable,beinginastateofrigidity.ButatthestationsintheeasternandsouthernmarginsoftheOrdosblock,severallayersofhighvelocityratio(about1.80)havebeenfound,inwhichtheaveragevelocityratiounderKelanandLishistationsattheeasternmarginissystemicallyhigherthanthatofthegeneralelasticalbodywaves(1.732).Thisreflectsthatthecrustunderthemarginalareasismoreactiverelatively,andothermaterialsmayexistintheselayers.Finally,wediscussedtherelationshipamongearthquakes,velocitystructuresbeneathstationsandfaults.

简介：Inthispaper,thecorrespondingrelationoftheevolutionarycharacteristicsofgeodeticdeformationfieldswithseismicactivityformorethan20yearsintheNorth-SouthseismiczoneandEastofQinghai-XizangMesshasbeeninvestigated.Notonlyisgeodeticdeformationinnon-homogeneityforthespace-timedistributionbutalsodeformationfieldsareinmacroscopicsimilarityfortheidenticaltimeinterval.Theinheritedtectonicmovementisatotaltendencyofrecentcrustalmovement,andthemotionmodeisinundulations.Therearestagesofaccumulationandrelease-adjustingofstrainenergyincrustalmovementprocesses,whichmaybethedynamicmechanismofrelativelyquietandactiveseismicity.Theanalysisofthecrustalmovementtendencysince1991isofsomesignificanceforjudgingthestressstateandthelargeseismicsituationinthearea.

简介：自从其22相对独立于另外的中等强壮的地震的1980，有女士5.0的26地震在Qinghai-Xizang(西藏)块的东北边缘被记录了。关于在22中等强壮的地震前的小地震活动的增加的研究显示了那项小地震活动在17中等强壮的地震前被提高。尽管增加的seismicity是在Qinghai-Xizang(西藏)块的东北边缘的普通现象，我们在由这现象预言中等强壮的地震有困难。以便通过小地震的增加的seismicity预言中等强壮的地震，这篇论文试图建议一个新方法，它通过小地震的分发模式的变化计算小地震频率基于在东北Qinghai-Xizang(西藏)块的小地震活动的特征，然后做主要应用。结果证明我们能通过新方法在中等强烈地震前在小地震的频率获得明显的异例，与这个小地震频率异例的振幅上的小空间范围效果。我们能获得对为在Qinghai-Xizang(西藏)块的东北边缘的中等强壮的地震的短期的异例索引中间。

简介：Inthispaper,usingthe1999~2007GPSvelocityfielddata,andbychoosingtheoptimalblockmodel,weobtainedthedeformationmodelsapplicabletotheboundaryzonesofmajorblocksandtheslipratesofblockboundaryfaultsonthemid-southernsegmentoftheNorth-SouthSeismicBelt.Theresultsshowthat:ontheLongmenshanfaultzone,thetensionalandcompressivesliprateissmallontheBaoxing-Wenchuansegment,about0.5~1.8mm·a-1,andtherateisrelativelysignificantonthesegmentoftheWenchuan-Maoxian,as1.8~3.8mm·a-1;ontheXianshuihefaultbelt,thereisacertaindifferenceinspatialdistributionbetweenthetensionalsliprateandstrike-sliprate:thetensionalsliprate(8.1mm·a-1)isbiggerthanthesinistralstrike-sliprate(4.8mm·a-1)atthenorthoftheLuhuoregion;thetensionandcompressionsliprateisbasicallythesameasthestrike-sliprateatLuhuo-Dawu;theDawu-Kangdingsectionpresentsatrendofdecreasedstrike-sliprateandincreasedtensionalsliprate;theKangding-Shimiansegmentshowsastrike-slipnature;thestrike-sliprateissignificantlygreaterthanthetension/compressionrateontheXiaojiangfaultzone;thesliprateontheRedRiverfaultzoneshowsobviousspatialsegmentation,thesliprateissmallerinitsnorthwestpart,butwithacertainamountoftensional/compressioncomponent,4.7mm·a-1ontheJingdongsegment.ThesegmenteastofJingdong(westernGejiu)ismainlyofstrike-slip,withasliprateof4.5mm·a-1.

简介：关于记录M≥的地震5.0那从1970～发生在Qinghai-Xizang(西藏)块的中间的北部分2003，在这研究，我们通过4个参数在主要震动前描述弱震和改进和他们的地震活动的异常静止的时间、空间的集中化特征，它基本上没被相关：地震时间集中化度参数C_t，地震空间集中化度参数C_d，η值和弱震频率等等。根据计算结果，在有M≥的地震前，5.0发生在Qinghai-Xizang(西藏)块的中间的北部分，这被看见了，弱震oftenshows的频率上升并且落下，他们的力量证明有时空的明显的改进和集中化分发是明显的。