简介：OnOctober27,2001,alargeearthquakewithMs6.0,namedtheYongshengearthquake,occurredalongtheJinshajiangsegmentofChenghaifaultinYongshengCounty,YunnanProvince.ItisthelargesteventtooccuralongtheChenghaifaultinthelast200years.Theseismo-geologicalsurveyshowsthattheseismogenicfault,whichistheJinshajiangsegmentofChenghalfault,takesleft-lateralstrike-slipasitsdominantmovementpattern.Accordingtodifferencesinverticalmotion,motiontime,landformsandscales,theChenhalfaultcanbedividedintoeightsegments.TheJinshajiangsegmenthasaverticaldislocationrateof0.4mm/a,farlowerthanthemeanrateoftheChenghaifault,about2.0mm/a.It'sdeducedthatthetwosidesofJinshajiangsegment'stuck'tightlyandhinderedthestrike-slipoftheChenghaifault.ThestrongearthquakedistributionbeforethiseventshowsthattheJinshajiangsegmentwasintheseismicgap.TheChenghaifault,asaboundaryoftectonicsub-blocks,makestheNorthwestYunnanblockandtheMiddleYunnanblockmoveclockwise,andtheirmarginsmoveoppositelyalongtheChenghalfault.InthemotionprocessoftheChenghaifault,structuralhindranceandtheseismicgapofstrongearthquakesarepropitioustotheconcentrationandaccumulationofstructurestress.Asaresult,theYongshengMs6.0earthquakeoccurred.TheSujiazhuang-ShangangfusegmentissimilartotheJinshajiangsegmentwithalowverticalmotionrateof0.3mm/aandintheseismicgap.Soit'spostulatedthatthesegmentmaybecomeanewstructurehindrance,andtheYongshengMs6.0earthquakemaytriggertheoccurrenceoffuturelargeearthquakesalongthissegment.

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简介：ThispapersummarizesthelayoutoftheYunnanseismicELFelectromagneticobservationnetwork,siteselection,ELFelectromagneticinstrumentsystem,dataprocessingandotherconstruction.TheprincipleandmethodofusingtheELFelectromagneticwavetechniquetomonitorandpredictearthquakesareexpounded.ThelongtermmonitoringofELFelectromagneticfieldsiscarriedoutintheYunnanearthquakepronearea,andatthesametime,thechangesinelectricalparametersandspatialelectromagneticfieldsoftheregionalcrustalmediumstructurearemonitored.Thefunctionssuchasautomatic,quasirealtime,remotemonitoring,networkmonitoring,dataprocessingspecialization,dataservice,datasharingandindustrializationoftheELFelectromagneticobservationdatahavebeenrealized.Inordertocapturethedeepelectromagneticprecursoryinformationoftheearthquakes,serviceforearthquakepredictionresearch,whichhasbroadapplicationprospectsanddevelopmentpotential.ThroughtheresearchoftheseismicityofYunnaninthetrialrunperiodoftheproject,thepreliminaryresultsoftheextremelowfrequencyelectromagneticobservationoftheYunnanearthquakeinrecentyearsaregiven.TheelectromagneticprecursorsandtheelectromagneticeffectsoftheYangbiearthquakearerecorded.Inthe3-monthperiodbeforetheearthquake,thepowerspectrumoftheelectricandmagneticfields,theapparentresistivityandtheimpedancephaseintheobservedsignalsareallabnormal,andgraduallyincreasedwithtime.Themaximumvalueisreached20daysbeforetheearthquake,andanearthquakeoccurswhenthechangeisrestoredtonormal.

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简介：辽宁是历史地震资料比较缺乏的地区,深入研究历史疑难地震,尤其是确认一些破坏性地震,对补充已有的地震目录和开展地震预测及工程场地地震安全性评价有重要作用。在历史地震研究中认真考查,论证已有的地震史料是最主要的手段和方法。但是若能在此基础上,利用现代地震资料,按＂地震重复＂发生理论反推一些历史上可能存在的破坏性地震,也可以认为是对历史地震研究方法的一种补充。按照这一思路,本文在进一步分析地震史料的基础上,通过与现代地震活动图像和大地震震害现象的对比,确认辽宁地区1509年4月21日的地震是一次破坏性地震,并对1552年10月27日的地震做了讨论。

简介：Usingthedouble-differencerelocationalgorithm,werelocatedthe20April2013Lushan,Sichuan,earthquake(MS7.0),andits4,567aftershocksrecordedduringtheperiodbetween20AprilandMay3,2013.Ourresultsshowedthatmostaftershocksarerelocatedbetween10and20kmdepths,butsomelargeaftershockswererelocatedaround30kmdepthandsmalleventsextendedupwardnearthesurface.Verticalcrosssectionsillustrateashovel-shapedfaultplanewithavariabledipanglefromthesouthwesttonortheastalongthefault.Furthermore,thedipangleofthefaultplaneissmalleraroundthemainshockthanthatinthesurroundingareasalongthefault.Theseresultssuggestthatitmaybeeasytogeneratethestrongearthquakeintheplacehavingasmalldipangleofthefault,whichissomewhatsimilartothegenesisofthe2008Wenchuanearthquake.TheLushanmainshockisunderlainbytheseismicallyanomalouslayerswithlow-VP,low-VS,andhigh-Poisson’sratioanomalies,possiblysuggestingthatthefluid-filledfracturedrockmatricesmightsignificantlyreducetheeffectivenormalstressonthefaultplanetobringthebrittlefailure.TheseismicgapbetweenLushanandWenchuanaftershocksissuspectedtobevulnerabletofutureseismicrisksatgreaterdepths,ifany.

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简介：分析了2009年2月20日柯坪5．2级地震前柯坪块体地震活动和前兆异常。柯坪5．2级地震前5、6级地震异常平静，4级地震平静达到了“十五”项目总结的异常指标，且震前1个半月2级以上地震“成片”向震中附近地区迁移；震前乌什水管仪、阿合奇地倾斜和巴楚土层应力存在不同程度的中短期异常和临震异常。

简介：十几年的观测实践表明,虽然莆田六中的浅水井不能像深水井那样记录到固体潮和水震波,但是由于它位于地质构造的特殊部位,处在若干条大小断裂带的交汇处或其邻近地区,也必为地应力变化聚合的“敏感部位”。我们通过对该井水位变化的资料进行了分析研究,去伪存真,获取到了井水位震前异常变化的震兆信息,并成功地进行了闽台地区的地震预报的尝试,这说明该井水位的异常变化对闽台地区的地震具有一定的映震能力,本文将对其进行浅析和探讨。

简介：运用法学原理,结合地震监测设施和观测环境保护法律、法规,对(地震行政执法案例选编>中提供的20起地震监测设施和观测环境保护行政执法案例进行了综合统计分析,探讨了实际工作中涉及到的若干法律问题.

简介：［ＢｒｉｅｆＮｅｗｓ］：ＡｎＭｓ＝７．３ｅａｒｔｈｑｕａｋｅｏｃｃｕｒｒｅｄｉｎｔｈｅｓｏｕｔｈｅｒｎＡｎＭｓ＝７．３ｅａｒｔｈｑｕａｋｅｏｃｃｕｒｒｅｄｉｎｔｈｅｓｏｕｔｈｅｒｎｐａｒｔｏｆｔｈｅＴａｉｗａｎＳｔｒａｉｔ（２２．６°Ｎ，１１８．７°...

简介：同志们:在20世纪接近尾声、21世纪的曙光即将来临的时刻,我省召开了这次福建省防震减灾30年暨福建省地震学会成立20周年纪念大会,这在我省防震减灾事业发展史上具有重大和深远的意义。这次会议不仅是一次回顾历史,全面总结30年实践和探索的经验与成就的大会,也是承前启后、继往开来,为把我省防震减灾事业全面推向21世纪而继续奋斗的誓师大会。首先,我要对参加今天庆祝大会的中国地震局领导和省政府领导以及各界代表表示热烈欢迎!对中国地震局和省政府长期以来对福建省防震减灾工作正确而有力的领导,以及社会各界的关心和支持表示衷心的感谢!对三十年来在我省防震减灾工作岗位上兢兢业业、默默无闻、无私奉献的基层干部职工致