简介：Athree-dimensionalrigidbodyontheshapeofaparallelepipedismodelledinordertorockonasideoravertexofthebase,inordertoevaluatetheseismicresponseofrigidblockslyingonahorizontalsupport.Thecenterofmassofthebodyisconsideredaseccentricwithrespecttoitsgeometriccenter.Asseismicinput,threeItalianrecordedaccelerograms,withdifferentspectralcontent,areused.Thestudyismainlyconductedtohighlightthedifferencesbetweentheseismicresponseof2Dand3Dmodelsofrigidblocks,withtheaimtounderstandif,insomecases,theuseofthe3Dmodelofrigidblockisrequiredtoobtainsaferresults.Infact,theoutcomesshowthatinsomerangesofthegeometricalandmechanicalparametersthatcharacterizetheexcitationandthebody,atwo-dimensionalmodel,whichisnotabletoconsiderthe3Drockingonavertex,canprovideunsaferesults.Inparticular,itisfoundthattheoverturningprocessofthethree-dimensionalblockcanoccurunderexcitationswhicharelowerthanthosewhichoverturnacorrespondingtwo-dimensionalblock.

简介：Wesuccessfullyemployanautomaticcentroidmomenttensor(CMT)inversionsystemtoinfertheCMTsolutionsoftheFebruary12,2014MS7.3Yutian,Xinjiangearthquakeusingnear-fieldseismicwaveforms(4°<△<12°)observedbythevirtualChinaseismicnetworks,whichhavebeenrecentlysetup.Theresultsindicatethatthiseventoccurredonaruptureplane(strike243°,dip70°,andrake-18°),showingleft-lateralstrike-slipfaultingwithaminornormal-faultingcomponent.Thecentroidinthehorizontaldirectionislocatednearly13kmeastoftheepicenter(36.123°N,82.499°E),andthebest-fittingcentroiddepthisaround10km.Thetotalscalarmoment,M0,isretrievedwithanaveragevalueof3.05×1019N·m,correspondingtomomentmagnitudeMW6.92.Mostoftheenergyisreleasedwithinabout14s.Moreover,wediscussaboutthepotentialapplicationofthissysteminearthquakedisasterdecision.

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简介：本文将数字台网建立以来在使用数字地震记录仪中遇到的仪器设备故障及环境对仪器设备的影响加以总结。

简介：BasedonthefirstarrivalPandSdataof4625regionalearthquakesrecordedat174stationsdispersedintheYunnanandSichuanProvinces,the3-Dvelocitystructureofcrustanduppermantleintheregionisdetermined,incorporatingwithpreviousdeepgeophysicaldata.Intheuppercrust,apositiveanomalyvelocityzoneexistsintheSichuanbasin,whereasanegativeanomalyvelocityzoneexistsinthewesternSichuanplateau.TheboundarybetweenthepositiveandnegativeanomalyzonesistheLongmenshanfaultzone.TheimagesoflowercrustanduppermantleintheLongmenshanfault,Xianshuihefault,Honghefaultandothersshowthecharacteristicoftectonicboundary,indicatingthatthefaultslikelypenetratetheMohodiscontinuity.Thenegativevelocityanomaliesatthedepthof50kmintheTengchongvolcanicareaandthePanxitectoniczoneappeartobeassociatedwiththetemperatureandcompositionvariationsintheuppermantle.TheoverallfeaturesofthecrustalandtheuppermantlestructuresintheSichuan-Yunnanregionaretheloweraveragevelocityinbothcrustanduppermostmantle,thelargecrustalthicknessvariations,andtheexistenceofhighconductivitylayerinthecrustor/anduppermantle,andhighergeothermalvalue.AllthesefeaturesarecloselyrelatedtothecollisionbetweentheIndiaandtheAsiaplates.ThecrustalvelocityintheSichuan-Yunnanrhombicblockgenerallyshowsnormalvalueorpositiveanomaly,whilethenegativeanomalyexistsintheareaalongthelargestrike-slipfaultsastheblockboundary.Itisconducivetothecrustalblockside-pressingoutalongthefaults.Inthemajorseismiczones,theseismicityisrelativetothenegativeanomalyvelocity.Moststrongearthquakesoccurredintheupper-midcrustwithpositiveanomalyornormalvelocity,wherethenegativeanomalyzonegenerallyexistsbelow.

简介：Inthispaper,accordingtotheresultsofthesatelliteimageryinterpretationandfieldinvestigation,westudytheactivefeaturesandthelatestactivetimesoftheChuxiong-Nanhuafault,theQuaternarybasinsformationmechanism,andtherelationshipbetweenthefaultandthe1680ChuxiongMs6%earthquake.SeveralQuaternaryprofilesatLvhe,NanhuarevealthatthefaulthasoffsetthelatePleistocenedepositsoftheT2andT3terracesofLongchuanriver,indicatingthatthefaultwasobviouslyactiveinlateQuaternary,TheChuxiong-NanhuafaulthasbeendominatedbydextralstrikeslipmotioninthelateQuaternary,withanaveragerateof1.6-2.Omm/a.SeveralpullapartQuaternarybasinsofChuxiong,Nanhua,andZiwuetc.havedevelopedalongthefault.The1680ChuxiongMs6%earthquakeandseveralmoderateearthquakeshaveoccurrednearthefault.TheChuxiong-Nanhuafaultaretheseismogenicstructureofthoseearthquakes,thelatestfaultmovementwasinthelate-Pleistocene,andeventheHolocene.Inlargearea,theChuxiong-NanhuafaultandtheeasternQujiangfaultandtheShipingfaultcomposedasetofNW-trendingobliqueorientationactivefaults,andthemotioncharacteristicsareallmainlydextralstrikeslip.Themotioncharacteristics,liketheredriverfaultoftheSichuan-YunnanRhombicBlocksouthwesternboundary,areconcernedwiththeescapingmovementoftheSichuan-YunnanRhombicBlock.

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简介：通过对发生于1999～2000年间库玛中东段地区3次5级以上地震前地下流体短临异常的分析对比，得出了该地区地下流体短临异常的时空强演化特征。

简介：

简介：Thispaperstudiesthree-dimensionaldiffractionofobliquelyincidentplaneSHwavesbytwininfinitelylongcylindricalcavitiesinlayeredporoelastichalf-spaceusingindirectboundaryelementmethod.Theapproachisvalidatedbycomparisonwiththeliterature,andtheeffectsofcavityinterval,incidentfrequency,andboundarydrainageconditiononthediffractionarestudiedthroughnumericalexamples.Itisshownthat,theinteractionbetweentwocavitiesissignificantandsurfacedisplacementpeaksbecomelargewhentwocavitiesareclose,andthesurfacedisplacementmaybesignificantlyamplifiedbytwincavities,andtheinfluencerangewithlargeamplificationcanbeaswideas40timesofthecavityradius.Surfacedisplacementsindryporoelasticcaseandsaturatedporoelasticcaseswithdrainedandundrainedboundariesareevidentlydifferentundercertaincircumstances,andthedifferencesmaybemuchlargerthanthoseinthefree-fieldresponse.

简介：这份报纸论述造的三故事的增强的水泥(RC)的一个所有框架模型的分析在1999台湾假装聪明的地震损坏了的三维的有限元素(FE)。尽管他们的贡献在设计被忽视，大楼的非结构的砖墙充当了一个地震抵抗元素。因此，一个典型框架的全部结构被建模，静态、动态的非线性的分析被进行评估砖墙的贡献。然而，分析的结果更加由于粗糙的网孔discretizations被过高估计，它由于有限计算机资源是不可避免的。这研究由修改改正overestimations(1)张力的力量并且(2)砍水泥和砖的僵硬减小因素。尽管，结果显示砖墙改进框架力量砍失败在列被引起由拱肩墙弄短。然后，三的有效性打字地震翻新被评估。一楼的最大的飘移被89.3%，94.8%，和27.5%减少由限制钢，Full-RC，和完整砖的模型分别地。最后，有土壤的模型的可行性分析被进行。分析显示土壤伸长尽管没有重要差别被观察，造的自然时期当模特儿。

简介：2015年7月3日新疆皮山Ms6．5级地震灾区地处塔里木盆地南缘，该地自然条件恶劣，经济极为落后，灾区农村的民房除了抗震安居工程建设的房屋外，还有大量抗震性能较差的民居，在地震中受损严重，经济损失较大。灾区大部分位于山前溢出带，地下水位浅、地基土层软弱等场地条件对地震动有放大作用，震害影响范围较大。灾后重建中应继续加大安居富民工程的经费投入力度。灾区北部人口密集，地基土层软弱，工程地质条件差，建议在今后的安居富民建设中加强地基处理。

简介：对2005年3月6日台湾宜兰海域6.1级有感地震的速报情况进行总结,并对其地震特征进行了初步分析。

简介：Anew3Dvelocitymodelofthecrustanduppermantleinthesoutheastern(SE)marginoftheTibetanplateauwasobtainedbyjointinversionofbody-andsurface-wavedata.Forthebody-wavedata,weused7190eventsrecordedby102stationsintheSEmarginoftheTibetanplateau.Thesurface-wavedataconsistofRayleighwavephasevelocitydispersioncurvesobtainedfromambientnoisecross-correlationanalysisrecordedbyadensearrayintheSEmarginoftheTibetanplateau.ThejointinversionclearlyimprovesthevSmodelbecauseitisconstrainedbybothdatatypes.Theresultsshowthatataround10kmdepththerearetwolow-velocityanomaliesembeddedwithinthreehigh-velocitybodiesalongtheLongmenshanfaultsystem.Thesehigh-velocitybodiescorrespondwellwiththePrecambrianmassifs,andthetwolocatedtothenortheastof2013MS7.0Lushanearthquakeareassociatedwithhighfaultslipareasduringthe2008Wenchuanearthquake.Theaftershockgapbetween2013Lushanearthquakeand2008Wenchuanearthquakeisassociatedwithlow-velocityanomalies,whichalsoactsasabarrierzoneforrupturesoftwoearthquakes.Generallylargeearthquakes(M≥5)intheregionoccurringfrom2008to2015arelocatedaroundthehigh-velocityzones,indicatingthattheymayactasasperitiesfortheselargeearthquakes.Jointinversionresultsalsoclearlyshowthatthereexistlow-velocityorweakzonesinthemid-lowercrust,whicharenotevenlydistributedbeneaththeSEmarginofTibetanplateau.

简介：从中国大陆动力学环境分析入手，分析了全球强震活动对中国大陆地震活动的影响、中国大陆强震活动特征，特别是对1900年以来中国大陆8级强震后第一、第二、第三年内大陆地区6级以上地震的频次和发震地点进行了统计分析后，对我国未来3年的地震形势作出了判定。

简介：以2013年福建省陆海联测炸测实验工作为例,阐述了在野外流动地震监测中,利用当今最为流行的3G无线网络架构与IPSecVPN技术,应用其保密性高、应用灵活、价格低廉的优点,结合福建省地震局在地震行业网网络建设的实际情况,快速架构与地震行业网的数据通讯模式,使得野外采集数据能够迅速的传到总部指挥中心,有效的解决了野外流动地震监测中数据实时传输的问题,保障了指挥中心的快速响应与决策作用.