简介：本文以汾渭地震带为例和以小震P、S振幅比测定的震源参数尝试应用了用小震断层面解反演区域平均应力场的方法。结果表明,该方法既吸收了用振幅比资料测定震源参数所需记录资料少的优点,又提供了较多震源信息,同时,由于计算中考虑了震源参数测定不稳定性等因素,因而较切合实际。

简介：利用安宁河-则木河断裂带上的跨断层流动形变资料,计算了断层活动累积量,定量研究了断层在不同时间段内的活动特征,然后采用断层活动总体状态参量R（t）值对断层总体活动特征进行了综合分析,探讨了其与地震活动的关系.结果表明：安宁河-则木河断裂带在观测期内以左旋走滑活动为主,兼具逆冲活动;断层总体活动状态参量R（t）显示,断层整体活动的不稳定性与强震有关,断层活动不稳定时,地震活动也较强烈.

简介：运用形变速率累加法对青藏决体东北缘积累近30年的6个跨断层流动水准场地观测资料进行了分析,讨论了异常信息提取的经验和方法,搜集并分析了各场地周围400km范围内的震例,获得了形变速率累加法的应用经验与前兆异常特征：①异常累加图比原始曲线图在异常的识别上更加突出和直观;②该方法只对超出控制限较连续的异常点残差进行累加,发生间隔较长的异常点则不进行累加计算;③从异常开始到发生地震的时间上得知,该方法可作为地震中期预报指标。

简介：本文采取将经验格林函数法与随机有限断层法相结合的方式，突出体现了各自方法的优点，通过经验格林函数法确定地震震源参数，用随机有限断层法计算参数、检验其合理性。利用1998年新疆阿图什M6．9级地震的肘L4．7级余震记录，合成了这次地震的最大余震Ms6．0级地震的加速度记录，并将合成的结果与实际记录在频域和时域做了对比，分析研究了地震动特征和这次最大余震的可能破裂特征。同时对经验格林函数法需进一步改进的方向进行了探讨。

简介：

简介：AstatisticalanalysisontheWenchuanaftershockactivitytriggeredbytidalforcesissystematicallystudiedbasedonSchusterstest,includingearthquakestriggeredbytidalforce,tidalstressandtidalcoulombfailurestress.TheresultsshowthatagroupofstrongaftershockswhichoccurredattheendofJulytoearlyAugustin2008atthenorthofWenchuanwereobviouslytriggeredbyearthtide,thesameconclusionisdrawnbySchusterssmoothtestofthetidalforce,tidalstressandtidalcoulombfailurestress.Inaddition,theWenchuanaftershockactivityisobviouslytriggeredbyfortnighttide.Inthenorth,theaftershockshappenedmorefrequentlyinthefirstandlastquartersofthemoon,andinthesouth,theaftershockshappenedmorefrequentlyinthefirstandlastquartersofthemoonandduringthefullmoon.

简介：本文以地震对应法分析了莆田地震台DK1应力孔的前兆异常特点。

简介：一、地震基本参数表1　地震基本参数表发震时间年月日时分秒震　中　位　置微　观宏　观东经北纬东经北纬参考地名震级(ＭＳ)震源深度(Ｋｍ)震中烈度　地震类型　196804011705051181°247°117°32′24°54′华安新圩52Ⅵ+主余震型　　宏观震中是取Ⅵ度等震线的中心位置,位于华安县新圩南,与微观震中有较大偏离,微观震中在同安县城西南,两者之间相距约60公里。二、地震烈度分布本次地震发生于我省地震队伍成立之前的1968年,现场调查工作在三年之后才补充进行。由于极震区的烈度达Ⅵ度强,民房遭受一定程度的损坏,故震中及Ⅵ、Ⅴ度等震级的确定是可信的,但Ⅳ度线就无从勾划了。图1-1为本次地

简介：Ｐｒｅｓｅｎｔａｄｄｒｅｓｓ：ＳｏｕｔｈＣａｌｉｆｏｒｎｉａＵｎｉｖｅｒｓｉｔｙ，ＵＳＡ．ＣｏｎｔｒｉｂｕｔｉｏｎＮｏ．９３Ａ００３２，ＩｎｓｔｉｔｕｔｅｏｆＧｅｏｐｈｙｓｉｃｓ，ＳＳＢ，Ｃｈｉｎａ．ａｎｄｓｔａｔｉｏｎａｒｅｓｅｐａｒａｔｅ，ｓｕｐｐｏｓｉｎｇａｒａｎｄｏｍａｎｄｈｏｍｏｇｅｎｅｏｕｓｄｉｓｔｒｉｂｕｔｉｏｎｏｆｔｈｅｓｃａｔｔｅｒｓｉｎａｔｈｒｅｅ－ｄｉｍｅｎｓｉｏｎａｌｉｎｆｉｎｉｔｅａｎｄｐｅｒｆｅｃｔｌｙｅｌａｓｔｉｃｍｅｄｉｕｍ．ＴｈｅｅｎｅｒｇｙｄｅｎｓｉｔｙａｔａｄｉｓｔａｎｃｅｏｆｒｉｓｇｉｖｅｎａｓＥ（ｒ，ｔ｜ω）＝［Ｗ０（ω）ｇ０（ω）］／（４πｒ２）．Ｋ（ｖｔ／ｒ）．ｅｘｐ（－ωＱｃ－１ｔ）ｖｔ＞ｒ（２）ＷｈｅｒｅＫ（ｘ）＝（１／ｘ）ｌｎ［（ｘ＋１）／（ｘ－１）］，ａｎｄｇ０（ω）ｉｓｔｈｅｔｏｔａｌｓｃａｔｔｅｒｉｎｇｃｏｅｆｆｉｃｉｅｎｔｃｈａｒａｃｔｅｒｉｚｉｎｇａｓｃａｔｔｅｒｉｎｇｐｏｗｅｒｐｅｒｕｎｉｔｖｏｌｕｍｅｏｆｔｈｅｈｏｍｏｇｅｎｅｏｕｓｍｅｄｉｕｍ．Ｃｏｍｐａｒｉｓｏｎｏｆｖａｒｉｏｕｓｏｂｓｅｒｖａｔｉｏｎｓｉｎｃｌｕｄｉｎｇｃｏｄａｄｅｃａｙ?

简介：~~

简介：AnearthquakewithM7.1occurredinYushu,QinghaiProvince,China,at07:49a.m.onApril14,2010,accordingtotheChineseSeismicStationNetwork.Thesequenceisafore-mainafter-shocktypesequence.AforeshockwithM4.7occurred2hoursand11minutesbeforethemainshock.Therewere12foreshocksand2385aftershocksuntilJune31,2010.Inwhich,thereare21aftershocksbetweenM3.0andM3.

简介：一、地震基本参数表1　地震基本参数表发震时间年月日时分秒震　中　位　置微　观宏　观东经北纬东经北纬参考地名震级(ＭＬ)震源深度(Ｋｍ)震中烈度　地震类型　197701091153511177°249°1177°249°长泰坂里371926Ⅴ主震型　　微观震中定位于安溪龙涓的半林附近,宏观震中确定在长泰坂里的黄西坑,在前者西南面5公里左右。表中的震级为全省的平均值ＭＬ=37级。依据宏观烈度分布图,采用古登堡与李希特以及马德里的计算公式,得出的震源深度分别为19Ｋｍ和26Ｋｍ。图3-1　1977年1月9日长泰坂里地震等震线图二、地震烈度分布从图3-1可以看出,宏观震中位于长泰坂里的黄西坑(东经11

简介：系统分析了KJ—1记录器对拾震器输出电压灵敏度的要求，并对SK拾震器与KJ—1记录器的连接方法进行了研究。研究结果表明，只需对SK拾震器和KJ—1记录器进行改造，就能实现两者的完美配接，而其性能优于DK—1地震仪和基式地震仪。

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

简介：2011年1月19日安徽省安庆市MS4.8级地震发生后,笔者在第一时间深入地震灾区,开展了地震烈度调查和地震灾害评估工作。本文基于现场调查结果,对此次地震的构造背景、烈度分布及房屋典型震害进行了分析,并对经验教训进行了初步总结。

简介：Theauthorsstudiedtheseismicactivity,precursoryanomaliesandabnormalanimalbehaviorbeforetheApril14,2010MS7.1Yushuearthquake.AnalysisshowedthatanomalieswerenotrichbeforetheMS7.1Yushuearthquake,butprominentanomalieswereobserved,suchasthelongandmid-termtrendanomalycharacterizedbytheseismicquiescenceofMS6.0,MS5.0andMS4.0earthquakes,andtheanomaliesinprecursorobservationofsurfacewatertemperatureinYushuandDelinghaandelectromagneticmeasurementinPingan.Therewerealargenumberofanimalbehavioranomaliesappearingoneweekbeforetheearthquake.AnM4.7earthquakeoccurred130minutesbeforethemainshock.Inthispaper,westudiedthedynamicprocessoftheYushuearthquakepreparationusingtheearthquakefocalmechanismsolutionsontheBayanHarblockboundarysince1996.TheresultsshowthattheKalakunlunM7.1earthquakein1996,theManiM7.5earthquakeandtheYushuMS7.1earthquakehavethesamedynamicprocess.Longandmid-termtrendanomaliesmayberelatedtothedynamicsofevolutionofdifferentearthquakes.Thispaperalsodiscussestherecurrenceintervalofstrongearthquakes,foreshockidentificationandprecursorobservationoftheYushuMS7.1earthquake.

简介：ＳｔｕｄｙｏｎｃｏｒｒｅｌａｔｉｖｉｔｙａｍｏｎｇｃａｐａｃｉｔｙｄｉｍｅｎｓｉｏｎＤ０，ｉｎｆｏｒ－ｍａｔｉｏｎｄｉｍｅｎｓｉｏｎＤ１，ａｌｇｏｒｉｔｈｍｉｃｃｏｍｐｌｅｘｉｔｙＣ（ｎ）ａｎｄｂＶａｌｕｅＷＥＩ－ＢＩＮＨＡＮ（韩渭宾），ＧＵＩ－Ｘ...

简介：Basedondatacollectedfromatemporalseismicnetwork,andinadditiontothedatafromsomenearbypermanentstations,weinvestigatethevelocitystructureandseismicityintheRongchanggasfield,wheresignificantinjection-inducedseismicityhasbeenidentified.First,weusereceiverfunctionsfromdistantearthquakestoinvertdetailed1-Dvelocitystructuresbeneathtypicalstations.Then,weusethedouble-differencehypocenterlocationmethodtore-locateearthquakesofthe2010ML5.1earthquakesequencethatoccurredintheregion.There-locatedhypocentersshowthatthe2010ML5.1earthquakesequencewasdistributedinasmallareasurroundingmajorinjectionwellsandclusteredmostlyalongpre-existingfaults.Majorearthquakesshowafocaldepthlessthan5kmwithadominantdepthof～2km,adepthofmajorreservoirsandinjectionwells.Wethusconcludethatthe2010ML5.1earthquakesequencemighthavebeeninducedbythedeepwellinjectionofunwantedwateratadepth～3kmintheRongchanggasfield.

简介：Basedonthefittingonpaleoearthquakedataofintra-plateregionsinthenorthernpartofChi-naandgivingastatisticalmodeloftimeinterdependence,thepotentialdamageearthquakesinadefinitefutureperiodandcharacteristicsofpresentshocksalongtheLingwufaulthavebeenanalyzedbyusingdangerousprobabilityfunctionandsomenewdataconcerned.Wehavein-ferredthatthefaulthasenteredaperiodthatearthquakeswillprobablyoccur.ThereexistsapotentialdangerthatastrongearthquakewithMs7.0-7.5willoccurin10-100a.

简介：统计分析九江1井2008--2011年水位、水温在多次大震中的同震响应特征，结果显示：水位通常表现为在正常背景下振荡，水温则通常表现为突降后恢复正常，水位和水温对远场大震的同震响应存在着一致性。同时，九江1井水位对地震的同震响应灵敏性优于同井水温观测，但水位观测受降雨影响．且气压效应明显。