简介：Ms7.1Yushu地震的seismogenic差错的coseismic表面破裂地区包括三左走的主要破裂，给300以畲獧吗？

简介：Thepost-earthquakerapidaccurateassessmentofmacroinfluenceofseismicgroundmotionisofsignificanceforearthquakeemergencyrelief,post-earthquakereconstructionandscientificresearch.TheseismicintensitydistributionmapreleasedbytheLushanearthquakefieldteamoftheChinaEarthquakeAdministration(CEA)fivedaysafterthestrongearthquake(M7.0)occurredinLushanCountyofSichuanYa’anCityat8:02onApril20,2013providesascientificbasisforemergencyrelief,economiclossassessmentandpost-earthquakereconstruction.Inthispaper,themeansforblindestimationofmacroscopicintensity,fieldestimationofmacrointensity,andreviewofintensity,aswellascorrespondingproblemsarediscussedindetail,andtheintensitydistributioncharacteristicsoftheLushan'4.20'M7.0earthquakeanditsinfluentialfactorsareanalyzed,providingareferenceforfutureseismicintensityassessments.

简介：枚举的算法被介绍了进ASR模型的恰当的过程。与M6基于21大地震的详细学习。8在中国大陆，在大地震前的地震紧张版本的统计特征被总结了。在团中，紧张版本模型能被划分成五种类型。第一是DA模型，紧张版本在更宽广的区域在加速并且在震中附近在小区域速度。约38%地震样品具有这种类型。第二是AD模型，紧张版本在更宽广的区域在速度并且与占据ratioof在震中附近在更小的区域加速约19%。第三是ASR，仅仅加速的紧张版本能在被观察。这个模型的盒子等于大约14%。第四是数据设置就绪，仅仅速度的紧张版本能在被检查，等于大约24%。仅仅有第五种类型(LSR)的一件地震样品，它显示出一个线性紧张版本。在持续时间有36年差别预先震惊在加速并且速度的模型之间的序列。在大地震一般来说是一个典型特征以前，这对小地震的增加的seismicity的一个背景意味着那地震静止。为DA模型，分别地，为稳定的加速并且速度的紧张版本的批评区域的平均尺寸关于到400km和100km的260km到200km3～5次，1～2预定大小7的地震的破裂尺寸。0。广告模型是DA模型的反面。模型参数，m价值，好稳定性。ASR的比率关于为加速地震紧张版本现象的一样，不管紧张版本模型是什么，或紧张版本数量怎么大。关于速度地震紧张版本现象，DA模型有最特殊的速度紧张版本特征并且是地震紧张版本的典型特征，我。e。“速度在里面加速外面地震紧张模型”。

简介：Thevariationinload/unloadresponseratiobeforesomemoderateearthquakesisanalyzedbasedonthetheoryoftheload/unloadresponseratio.Theresultsshowthattheload-unloadresponseratioincreasesnoticeablybeforemoderateearthquakes,andtherearethreekindsofpatternsinwhichtheload/unloadresponseratiovariesandthedurationofnoticeableincreaseinload/unloadresponseratiorangesfromhalfayeartotwoyears.

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简介：高邮-宝应M4．9级地震是江苏陆地22年来发生的最大的地震。在震前2年发现省内流体井水位出现了群体性准同步变化，表现为震中区井水位的同步下降。本文重点分析了江苏省流体井水位变化特征，消除了气压、降雨和地下水开采的影响，用异常幅度与年变幅度比值、从属函数两种方法定量提取了震前异常变化，根据水位资料及其变化机理总结了震前水位的群体性异常特征，认为在弱震区井水位的群体性变化是分析判定地震前兆异常的有效指标。水位的群体性异常反映了震前区域应力场的调整，震源区为应力变化的集中区。

简介：OnApril25,2015,aM_S8.1earthquakeoccurredinNepal.IntheTibetareaofChina,thisearthquakecausedheavycasualtiesanddamagetohousing,roads,communications,otherlifelineengineering,waterconservancyandotherinfrastructure.Thispaperintroducesthebasicsituationoftheearthquake,andbasedontheinvestigationandassessmentofseismicintensity,thedamageofthedisasterareaisanalyzed,andbuildingtypesanddamagetothelifelinesystemsandvariousindustriesaregiven.Throughtheanalysisofthecharacteristicsoftheearthquakedisaster,thispaperpointsouttheexistingproblemsinseismicfortification,andfinallyputsforwardproposalsforthepreventionandcontrolofearthquakegeologicaldisasters,scientificplanningfortherestorationandreconstruction,strengtheningearthquakepreventionanddisasterreductionpropaganda,improvingtheawarenessofearthquakepreparednessintheagriculturalandpastoralareas,strengtheningtheguidanceandsupervisionofhousingconstructioninruralareastoreducethecasualtiesandlosses,andpromotingtheharmoniousdevelopmentofeconomyinTibet.

简介：通过对格尔木地震台地磁组合仪FHDZ—M15近5年所记录到的地磁观测资料进行各种典型干扰分析，找出仪器产生干扰的主要原因，提出对干扰的解决方法，进一步提高本台地磁观测资料质量。

简介：Inthispaper,basedonGansuDigitalSeismicNetworkdatasince1990,wecalculatedb-valueand⊿b-valueoftheneighborhoodareabeforethe2013Minxian-ZhangxianM_S6.6,earthquake.Theresultsshowthattheearthquakeoccurredatthemarginofthesignificantlylowerb-valueareainsoutheastofGansuandbeforetheearthquaketheneighborhoodareahadanobviouslyabnormal⊿b-value.Fromtheearthquakeandthespatialdistributionoflowb-value,theregionstillhasthepossibilityofgeneratingdangerousstrongearthquakes.

简介：InordertoexploretheabnormalvariationsbeforeandaftertheWen'anM5.1earthquakeonJuly4,2006,thegravitydataobservedbytheWenbaGravityObservationNetworkbeforeandaftertheearthquakewasanalyzed.Therelationshipsbetweengravitychangeandverticaldisplacementandshallowgroundwaterlevelwerediscussed,andelevationcorrectionofthegravitywaspreliminarilyperformed.TheresultsshowthattherewereabnormalgravitychangesbeforetheM5.1earthquake,whichappearedasgravityrisinginthewholeobservationnetwork,especiallyinthesouthpart.AhighgradientofgravityvariationappearedaroundtheepicenterbeforetheM5.1earthquake,especiallyduringtheshortperiodbetweenOctober2005toApril2006.TheboundaryofthepositiveandnegativegravityvariationsgraduallydeflectedandbegantorecoverfromOctober2007.

简介：2014年11月15日,在甘肃省白银市景泰县发生MS4.7地震,震源深度10km。在震中附近200km以内,甘肃省地震局共安装架设有14台各类形变观测仪器。本文通过对这些形变观测仪产出的分钟值观测资料做小波分析发现,在地震前1个月内共有11台(套)形变观测仪记录到了异常变化。其中:SSY、TJ、DSQ、SSQ型观测仪记录到异常的同步性非常好;CZB型观测仪记录到的异常比较乱,没有固定的规律。通过对这些异常变化的总结能够为地震预测提供一定的判断依据。

简介：汶川Ms8．0级地震发生在青藏高原东缘著名的龙门山断裂带上，造成了中央断裂和前山断裂共约330kin的地震地表破裂带。初步研究表明，龙门山断裂带上大震复发可能属特征地震模式。结合龙门山断裂带的地震地质情况和汶川地震地表破裂带的基本参数综合分析，本文从地质学、地震学和GPS数据分析三个方面评估了龙门山断裂带的大震复发周期。结果表明，上述三种方法获得的龙门山断裂带Ms8．0级地震的复发间隔分别为：3185a、170（02264a和4310a，平均为3000a左右：Ms7．5级地震的平均复发间隔为1000a左右；Ms7．0级地震的平均复发间隔为500a左右。这些结果与其他学者的研究结果相比，相差不多，基本反映了龙门山断裂带的地震能量水平和累积速度。

简介：Abrandnewexpertsystemforearthquakeprediction,calledESEP3.0,wassuccessfullydevelopedrecently,inwhichthefuzzytechnologyandneuralnetworkconceptionwereincorporatedandthesteeringinferencemechanismwasintroduced.Inadditiontothefunctionsofsymbolinferenceandexplanationofthefirstgenerationoftheexpertsystemandtheknowledgelearningofthesecondgeneration,ESEP3.0hasstrongerhuman-machineinteractionfunction.Itconsistsofknowledgeedition,machinelearning,steeringfuzzyinferenceengineandsynchronousexplanationsubsystems.Inthispaper,thecomponentsandthegeneraldescriptionofthesystemareintroduced.

简介：在在M_W9.0地震前的不同时间空间的领域的地震活动的特征被学习。结果如下:①T他在澳大利亚的板的北方边界地区的深地震的活动是显然加强的since1994，显示出增加的频率，大小和深度，特别关于地震深度的异构的分发(也就是在500km和689km之间)。同时thes使神圣7.0显然在苏门答腊岛和它的附近是的M≥的地震也加强了，并且与一段大约1000km和宽度300km②T形成了一个加强的区域他有7.0显示出的M≥的全球强震的时间分发异常地震静止活动的特性在M_W9.0地震前并且在它的活跃句号期间的年，强震形成了在NWW方向罢工的一条地震的带。同时，有地震差距，M≥的地震形成5.0在震中和它的附近的区域。③TwoM≥的深地震7.0半年以前发生在西方并且在澳大利亚的板的北方边界地区的东方。他们之一在在哪儿的苏门答腊岛发生了，是著名的有M≥的没有深地震6.0发生在过去的三十年里。三天以前发生的中等震动的④Thespace分发展出了NWW罢工沿着澳大利亚的板的北方边界地区的地震的带。⑤T他在澳大利亚的板的北方边界地区散布的火山的活动在过去的4年里被加强了，特别在M_W9.0地震的出现前的几个月。

简介：Ｃｏｍｐｌｅｘ　ｔｉｍｅ－ｓｐａｃｅ　ｓｐｒｅａｄｉｎｇ　ａｎｄ　ｆｏｃａｌ　ｍｅｃｈａｎｉｓｍ　ｏｆ　ｔｈｅ　１９８９　Ｂａｔａｎｇ　ｅａｒｔｈｑｕａｋｅ　ｓｗａｒｍ　（Ｍ＿ｓ＝６．７）（程万正）（陈天长）Ｃｏｍｐｌｅｘｔｉｍｅ－ｓｐａｃｅｓｐｒｅ...

简介：BasedonthewaveformdataobservedbytheregionalseismicnetworkofGansuProvince,wecalculatedtheapparentstressof422earthquakeswithM_L≥2.0occurringinthesurroundingareaoftheMinxianearthquakefromJanuary2010toJuly2014andobtainedthetemporalandspatialvariationofapparentstressbeforeandaftertheMinxianearthquake.Resultsshowthat(1)thehighvalueofapparentstressofearthquakeswithM_L≥4.0wasconcentratedintheepicenterareabeforetheMinxianearthquakewhilethatofearthquakeswithM_L<4.0wasnot;(2)ApparentstressaroundtheepicenterareashowedanobviousincreasingprocessbeforetheMinxianearthquakeandtheincreasingprocesshascontinuedafterthemainshock,whichmeansthatthisstudyareaisstillinthedangerofstrongearthquakes.

简介：Significantpostseismicdeformationofthe2008MW7.9WenchuanearthquakehasbeenobservedfromGPSdataofthefirst14daysaftertheearthquake.Thepossiblemechanismsfortherapidpostseismicdeformationareassumedtobeafterslipontheearthquakeruptureplaneandviscoelasticrelaxationofcoseismicllystresschangeinthelowercrustoruppermantle.WefirstlyusetheconstrainedleastsquaresmethodtofindanafterslipmodelwhichcanfittheGPSdatabest.Theafterslipmodelcanexplainnear-fielddataverywellbutshowsconsiderablediscrepanciesinfittingfar-fielddata.Toestimatetheeffectduetotheviscoelasticrelaxationinthelowercrust,wethenignorethecontributionfromtheafterslipandattempttoinverttheviscositystructurebeneaththeLongmenshanfaultwheretheWenchuanearthquakeoccurredfromthepostseismicdeformationdata.Forthispurpose,weuseaviscoelasticmodelwitha2DgeometrybasedonthegeologicalandseismologicalobservationsandthecoseismicslipdistributionderivedfromthecoseismicGPSandInSARdata.Bymeansofagridsearchwefindthattheoptimumviscosityis9×1018Pa·sforthemiddle-lowercrustintheChengduBasin,4×1017Pa·sforthemiddle-lowercrustintheChuanxiPlateauand7×1017Pa·sforthelowvelocityzoneintheChuanxiplateau.Theviscoelasticmodelexplainsthepostseismicdeformationobservedinthefar-fieldsatisfactorily,butitisconsiderablyworsethantheafterslipmodelinfittingthenear-faultdata.Itsuggeststhereforeahybridmodelincludingbothafterslipandrelaxationeffects.Sincetheviscoelasticmodelproducesmainlythefar-fieldsurfacedeformationandhasfewerdegreeoffreedoms(threeviscosityparameters)thantheafterslipmodelwithahugenumberofsourceparameters,wefixtheviscositiystructureasobtainedbeforebutredeterminetheafterslipdistributionusingtheresidualdatafromtheviscoelasticmodeling.Theredeterminedafterslipdistributionbecomesphysicallymorereas

简介：AnM=6.0earthquakeoccurredonFebruary23,2001inthewesternSichuanProvince,China.Themacroseismicepicentersituatedinthehighmountain-narrowvalleyregionbetweenYajiangandKangdingcounties.Accordingtofieldinvestigationintheregion,theintensityofepicentralareareachedVIIIandtheareaswithintensityVIII,VIIandVIare180km2,1472km2and3998km2,respectively.TheisoseismalsaregenerallyinellipticshapewithmajoraxistrendingnearN-Sdirection.TheearthquakedestroyedmanybuildingsandproducedsomephenomenaofgroundfailureandmountainousdisastersintheareawithintensityVIII.Thiseventmayberesultedfromlong-termactivitiesoftheLitangfaultandYunongxifault,twomainfaultsinthewesternSichuan.Themovementsbetweenthemainfaultsmadethecruststressadjustedandconcentrated,andfinallytheearthquakeonasecondaryfaultintheblockreleasedaquitelargeenergy.

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简介：本文收集了733个四川地区的实测钻孔数据,从中筛选出深度大于30m的268个钻孔剖面资料.分别获得了10m、15m、20m、25m和28m不同深度处的平均剪切波速（Vs）（d）与（Vs）（30）的对数线性相关关系.同时还与Boore（2004）的结果做了对比分析,比较了采用常数外推法和对数线性外推法得到的不同深度处剪切波速的残差分布.结果表明,不同深度处剪切波速（Vs）（d）与（Vs）（30）的对数相关关系可能具有一定的区域性特征,本文得到的对数关系更适合四川地区.对数线性外推法与常数外推法相比,前者的系统偏差更小;随着深度的增加,两种方法的外推误差均逐渐减小,但常数外推法普遍低估了（Vs）（30）值;当深度较浅时,低估的情况更为明显.本文的研究结果为利用大量的不足30m的钻孔资料估计（Vs）（30）值提供了参考.