简介：Inthispaper,wedeterminedanearthquakesequencelocationintheXingfengjiangareafromJune,2007toJuly,2014andthe3DP-wavevelocitystructurebyasimultaneousinversionmethod.Onthatbasis,westudiedtheoccurrencefeaturesofactivetectonicsandtheearthquakesourcemechanism.Theresultsshowthatthereservoirfracturesystemhasatendencytoincreasewithgradualdepthfromsoutheasttonorthwest,consistentwithgravitationalfieldresearchresults.Thereare4highvelocityzones(HVZ)underthedepthofthe7km-12kmcrustbetweentheXinfengjiangReservoirdamandXichangDistrict,Dongyuan.ThemaxvelocityofthebiggestHVZwhichisunderXichangis6.3km/s.Underthereservoirdamthereisastrongtectonicdeformationzone,asthecenterexitRenzishifault(F2),Nanshan-Aotoufaults(F4),Heyuanfault(F1)andShijiao-Xingang-Baitianfault(F5),7earthquakeswithML≥5.0(includingM6.1inMarch,1962)occurredatthehighgradientzoneoftheHVZⅢandHVZⅣedgewhichhasbeenunderthereservoirdamsince1960,withrelativityenergyreleasingmorethoroughly.ModerateseismicactivityoccurredattheHVZⅠedgewhichhasbeenunderXichangsince2012,andisadangerzoneforM5.0earthquakesinthefuture.

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：“设定地震”概念的提出已有一段时间，但鲜见在我国地震安全性评价中应用。同时，概率方法在地震危险性评价中，由于时程包线函数的确定源于震级一距离组合的不确定性而带有较大的任意性.本文建议在考虑潜源概率贡献的基础上，引入设定地震的期望震级和期望距离组合，用以控制包线函数。通过修改危险性分析椭圆模型的软件，可以进行计算并给出了算例。

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：厦门-金门大桥桥址地处闽东南沿海断隆带和泉州-汕头地震带南段,濒临台湾海峡,具有独特的地震地质构造环境。为了保障跨海大桥的长期安全性,无疑应对桥址地区的地震地质稳定性进行必要的研究,以期为工程设计提供科学依据。本文依据近30多年来,对该地区地质构造调查、陆海地球物理探测、地壳形变观测、地震活动性、地壳动力学和工程场地特征等资料进行了比较系统研究,结果表明该区断块构造自晚第四纪以来,呈间歇性上升运动,速率约1-2.3毫米/年,史今地震能量释放速率为(2.737-7.999)×107焦耳/公里2/年。现代地壳水平运动的速度矢量指向南东东,速度值为9-13毫米/年。从震源机制揭示,区域现代构造应力场主压应力轴(P轴)为SE125°,仰角2-8°,引张轴(T轴)为SW215°,仰角2-10°,中间轴(N轴)近垂直。这导致台湾动力触角对闽东南沿海产生强烈的推挤作用。形成潜在震源区。历史上在漳州和金门海外曾发生过61/4至61/2级地震,但桥区内未有破坏性地震(Ms≥43/4级)发生,表明厦门-金门地区构造稳定性介于泉州与南澳岛海外Ms≥7.0级地震的不稳定区之间,为相对较稳定区,适宜建跨海大桥。从地形地貌、工程地质条件显示,桥场地区由花岗岩、变质岩形成的丘陵、红土台地和第四系海陆交互相沉积层所组成。依据场地不同特点与

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：<正>各地(市)县人事局、科委、教委、民政局、科协,各省级学会、协会、研究会:中共福建省委办公厅和福建省人民政府办公厅今年4月颁发了《关于加强和改善对科协工作的领导,充分发挥科协作用的意见》(即闽委办[1997]24号文件),充分体现了省委、省政府对科协工作的高度重视和殷切期望,对推动我省各级科协的改革与发展有着极其重要的意义。

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.