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：StronggroundmotionparametersforShillongplateauofnortheasternIndiaareexamined.Empiricalrelationsareobtainedformainparametersofgroundmotionsasafunctionofearthquakemagnitude,faulttype,sourcedepth,velocitycharacterizationofmediumanddistance.Correlationbetweengroundmotionparametersandcharacteristicsofseismogeniczonesareestablished.Anewattenuationrelationforpeakgroundaccelerationisdeveloped,whichpredictshigherexpectedPGAintheregion.Parametersofstrongmotions,particularlythepredominantperiodsanddurationofvibrations,dependonthemorphologyofthestudiedarea.ThestudymeasureslowestimatesoflogarithmicwidthinShillongplateau.Theattenuationrelationestimatedforpulsewidthcriticallyindicatesincreasedpulsewidthdependenceonthelogarithmicdistancewhichaccountsforgeometricalspreadingandanelasticattenuation.

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。

简介：Theeffectsofhighermodesandtorsionhaveasignificantimpactontheseismicresponsesofasymmetric-plantallbuildings.Aconsecutivemodalpushover(CMP)procedureisoneofthepushovermethodsthathavebeendevelopedtoconsidertheseeffects.Theaimofthispaperistomodifythe(CMP)analysisproceduretoestimatetheseismicdemandsofone-wayasymmetric-plantallbuildingswithdualsystems.Ananalysisof10-,15-and20-storyasymmetric-planbuildingsiscarriedout,andtheresultsfromthemodifiedconsecutivemodalpushover(MCMP)procedurearecomparedwiththoseobtainedfromthemodalpushoveranalysis(MPA)procedureandthenonlineartimehistoryanalysis(NLTHA).TheMCMPestimatesoftheseismicdemandsofone-wayasymmetric-planbuildingsdemonstrateareasonableaccuracy,comparedtotheresultsobtainedfromtheNLTHA.Furthermore,theaccuracyoftheMCMPprocedureinthepredictionofplastichingerotationsisbetterthantheMPAprocedure.ThenewpushoverprocedureisalsomoreaccuratethantheFEMAloaddistributionandtheMPAprocedure.

简介：象lumped参数模型那样的分离模型和有限元素模型广泛地在地震的土壤扩大的解决方案被使用。然而，任何一个模型都精确地不估计土壤沉积物的自然频率，也不模仿一抑制频率独立。这研究基于模式等价方法为分层的土壤沉积物的一个维的粘弹性的反应分析开发一个新分离模型。新分离模型是一系列集中的群众，弹簧和缓冲筒与一种特殊配置描绘的一个一个维的相等的multi-degree-of-freedom(MDOF)系统。相等的MDOF系统的动态反应是导出的经分解，物理参数以形式的性质被提出。相等的MDOF系统与可得到的理论解决方案通过扩大函数的比较被验证。在相等的MDOF系统的自由(DOF)的度的适当数字被估计。有存在的相等的MDOF系统的比较研究分离模型被执行。建议相等的MDOF系统罐头确切介绍土壤存款抑制的自然频率和hysteretic并且向更精确的结果提供更少DOF，这被显示出。

简介：性能基于设计为估计大楼的地震要求成为一个有效方法。在不对称的计划高大楼更高的模式和扭转的效果是关键的。连续形式的闲差事(CMP)过程是过程之一考虑这些效果。另外，在以前的研究，在闲差事分析的土壤结构相互作用(SSI)的影响被忽略。在这份报纸，CMP过程就SSI而言为中间的单程的不对称的计划和高楼大楼被修改。扩大CMP(ECMP)过程被建议以便克服CMP过程的一些限制。在这方面，有不对称的计划的10，15和20座故事大楼就假定三个不同土壤条件的SSI而言被学习。用在一套双向地面运动下面的非线性的反应历史分析；这些大楼的准确回答是计算的。然后，ECMP过程被把这个过程的结果与历史作为一个准确答案以及形式的闲差事分析过程和FEMA356负担模式结果的非线性的时间作比较评估。结果表明ECMP过程的精确性。