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：Completerecordsofmorethan3,000earthquakeeventsintheShanxi,WenzhoureservoirearthquakesequencewererecordedfromAugusttoNovember,2014bythehigh-density,high-resolutionmonitoringstationsoftheZhejiangRegionalDigitalSeismicNetworkandthereservoirearthquakemonitoringnetwork,withamaximummagnitudeofM4.2.Basedon3-Depicenterlocation,focalmechanismsolutions,andincombinationwiththegeologicalandtectoniccharacteristicsofthereservoirarea,theearthquakesequenceisdiscussedinthispaper.ThelinearfittingoftheHypoSATlocationresultsshowthatthemainshockoccurredintheNWtrendingfaultandtheearthquakesequenceisconcentratedinbandsalongtheactivefaults,withastrikeof305°,dippingSWwithdipangleof85°.ByusingP-wavefirstmotionsymbols,weobtainedtheaveragefocalmechanismofM≥3.5earthquakes,withastrike308°anddip84°fornodalplaneII.Thefieldgeologicalsurveyandresearchshowthatthestrike,dipandrakeofnodalplaneIIareroughlyconsistentwiththeoccurrenceoftheShuangxi-Jiaoxifault.ThecomprehensiveanalysisrevealsthattheNW-trendingShuangxi-Jiaoxifaultistheseismogenicstructureoftheearthquakes.

简介：ＰｒｏｃｅｓｓｏｆｓｏｕｒｃｅｄｙｎａｍｉｃｓｏｆｔｈｅＪｉｎｇｔａｉｅａｒｔｈｑｕａｋｅ（Ｍ＝６．２）Ｘｕｅ－ＢｉｎＤＵ（杜学彬）；Ｚｈｉ－ＤｅＹＡＮ（闫志德）ａｎｄＭｉｎｇ－ＷｕＺＯＵ（邹明武）（ＥａｒｔｈｑｕａｋｅＲｅｓｅａｒｃｈＩｎｓｔｉｔｕ...

简介：Therehavebeen12possiblelocationsoftheearthquakesoccurringintheSouthYellowSeasince1505.Inthispaper,thelocationoftheearthquakethatoccurredin1505hasbeendeterminedbythecollectionofmorehistoricaldataoftheinfluencedfield,referringtheisoseismaldataofearthquakeswiththeepicentralintensityⅨandcombininggeophysicalfielddatawithtectoniccondition,duetoitsgreatinfluenceonseismicsafetyassessmentofsomesignificantengineering.

简介：通过云南M≥7．6级地震震亡分布的统计，研究大地震的伤亡分布规律，寻找影响伤亡的主要原因。结果表明，震亡人数主要分布在Ⅷ度以上烈度区，这一区域的震亡人数占震亡总数的94％以上，其中极震区占到70％以上。调查分析认为：在震级相近的情况下，震区地质构造、地形地貌是影响地震烈度的因素；房屋、人口密度、发震时间是震亡人数的重要影响因素；在未来的大地震中，人口密度大的断裂带及其附近是应急救援和医疗救护的重点区域，在断裂带及其附近盆地内的震亡人数比非盆地震亡人数多，要投入更多的救援和医疗救护力量。

简介：Thispaperisthesecondinatwo-partseriesthatdiscussestheprincipalaxesofM-DOFstructuressubjectedtostaticanddynamicloads.Theprimarypurposeofthisseriesistounderstandthemagnitudeofthedynamicresponseofstructurestoenablebetterdesignofstructuresandresponsemodificationdevices/systems.Underidealizeddesignconditions,thestructuralresponsesareobtainedbyusingsingledirectioninputgroundmotionsinthedirectionoftheintendedresponsemodificationdevices/systems,andbyassumingthattheresponsesofthestructureisdecoupleableinthreemutuallyperpendiculardirections.Thisstandardpracticehasbeenappliedtobothnewandretrofittedstructuresusingvariousseismicprotectivesystems.Verylimitedinformationisavailableontheeffectsofneglectingtheimpactofdirectionalcouplings(crosseffectsofwhichtorsionisacomponent)ofthedynamicresponseofstructures.Inordertoquantifysucheffects,itisnecessarytoexaminetheprincipalaxesofstructuresunderbothstaticanddynamicloading.Inthistwo-partseries,thefirstpaperisconcernedwithstaticloading,whichprovidesdefinitionsandfundamentalformulations,withtheconclusionthatcrosseffectsofastaticallyloadedM-DOFstructureresultingfromthelackofprincipalaxesareofinsignificantmagnitude.However,underdynamicorearthquakeloading,arelativelysmallamountofenergytransferredacrossperpendiculardirectionsisaccumulated,whichmayresultinsignificantenlargementofthestructuralresponse.ThispaperdealswithaformulationtodefinetheprincipalaxesofM-DOFstructuresunderdynamicloadinganddevelopsquantitativemeasurestoidentifycrosseffectsresultingfromthenon-existenceofprincipalaxes.

简介：Ｔｈｅ　ａｎａｌｙｓｉｓ　ｏｆ　ｄｉｓｋ　ｃｏｒｅ　ｆｒｏｍ　ｔｈｅ　Ｍａｏｐｉｎｇ　８００　ｍ　ｂｏｒｅ　ｈｏｌｅ（阮小平）（李方全）ＴｈｅａｎａｌｙｓｉｓｏｆｄｉｓｋｃｏｒｅｆｒｏｍｔｈｅＭａｏｐｉｎｇ８００ｍｂｏｒｅｈｏｌｅ￥Ｘｉａｏ－Ｐｉｎｇ...

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(ＭＤ)震源深度(Ｋｍ)震中烈度　地震类型　199203030602228118°10′24°06′118°06′24°12′漳浦海外(厦门南)48Ⅴ孤立型　　表1中宏观震中是根据陆地上勾划的等震线推测的,在微观震中的北西20公里左右。二、地震烈度分布本次地震的波及面很广,闽东南沿海地区均明显有感,调查在Ⅴ、Ⅳ度两个区内进行。由于地震影响场只有一小半在陆地上,勾勒出的是Ⅴ、Ⅳ度两条等震线的半椭圆弧线(见图14-1)。图14-1　1992年3月3日漳浦海外地震等震线图Ⅴ度区:震中位于海上

简介：AnM8.1earthquakethatoccurredwestoftheKunlunMountainsPasshascausedmorethan20collapsebodiesorzones,whicharemainlydistributednearthesurfaceseismicrupturezone,westofHohSaiLake.Thecollapsesareoffourtypes,bedrock,soilmassandicemasscollapsesandavalanches.Thespatialdistributionandthecharacteristicsofdevelopmentofthecollapsesareanalyzedinthepaper.Comparisedwiththosecausedbyotherearthquakes,thecollapsesaresmallerinscale.Inadditiontothelithologicalcharacteristicsofthecrustalmedia,topographic,geomorphicandclimaticfactors,weakerseismicgroundmotionisanimportantcauseforformationofthesmaller-scalecollapses.Thelongsurfacerupturezoneandweakergroundmotionareimportantfeaturesoftheseismicrupture,whichmayberelatedtothestructureofthepreexistingfault.

简介：1861M6。0地震发生在Pulandian的东方是有M6的另一强烈地震。0除1975HaichengMT以外。在Liaodong半岛的3地震。通过重复调查，1861地震的震中在Gupao被定位，Pulandian的村庄东方。基于损坏调查和现代仪器的地震数据，这项活动和Jinzhou差错，Pulandian海湾差错和趋势NW的地震风险的精确地点的分析Pulandian差错被分析。并且由比较在Pulandian和Haicheng之间的深seismogenic环境，，它被发现那neogenic活跃差错，趋势NW差错，与Jinzhou差错结合了，有更高地震的风险。趋势NW差错是1861M6的seismogenic结构。0地震。并且作为在Liaodong半岛的一个主要差错，Jinzhou差错控制了这个区域的seismicity。Pulandian海湾差错是相对不活跃的，与弱seismicity，并且对地震无关。

简介：ＡｓｏｕｒｃｅｅｘｔｅｎｔａｎａｌｙｓｉｓｏｆｔｈｅＬａｎｃａｎｇｅａｒｔｈｑｕａｋｅ（Ｍｓ＝７．６）ｏｆ１９８８ＳＩ－ＨＵＡＺＨＥＮＧ（郑斯华）ＪＩＡＮＹＡＮＧ（杨健）ＣｅｎｔｅｒｆｏｒＡｎａｌｙｓｉｓａｎｄｐｒｅｄｉｃｔｉｏｎ，ＣｈｉｎａＳｅｉｓ...

简介：本文讨论了天然设计地震波的调整问题。通过给出的工程计算实例,研究了产生天然设计地震波所采用技术的可行性和合理性。文中对塔吉克斯坦共和国杜尚别市鸟巢大厦结构隔震设计所需要的天然设计地震波进行了较为详细的研究,提供的结果可满足设计需求。同时文中还对天然设计地震波调整技术存在的问题进行了初步的讨论。

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简介：DetailedexaminationofhistoricaldataofearthquakesandfieldinvestigationsofloesslandslidecausedbytheearthquakeandtracingofactivefaultsinLanzhouareaindicatethattheYijitanputown,oneofsixtownsofJinchengcity,wasdevastatedbythe1125Lanzhouearthquake.ThecitlyisnowlocatedintheVinylonFactorysouthofHekou(RiverMouth)intheXigudistictofLanzhoucity.WedelerminedthatthesixoldtownsmentionedinhistoricalrecordslieinanareastretchingfromthesouthofXigudistricttoHekouinLanzhou.Thisisconsistentwiththedistibutionofloesslandslidescausedbytheearthquake,theextensionofHoloceneactivefaults,andthedistributionoftracesoftheseismicrupturezone.Acomprehensiveanalysisshowsthattheseismogenicstructureforthe1125LanzhouM7.0earthquakeshouldbetheXianshuigoufaultsegmentatthewesternterminationofthenorth-borderactivefaultzoneoftheMaxianshanMountainswhicharelocatedinsouthofLanzhoucitywiththedistanceofonly4km.

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简介：Amoredetailedanddeep-goinganalysisoftectonicconditionsforthe1989BohaiSeaM7.4earthquakeareahasbeenmadebasedonthedataofoilgeologicalexplorationandresultsofseismologicalresearches.TheobtainedresultfillsthegapinseismotectoulcresearchofLargeBohaiSeaearthquakeareaofNorthChina.TheearthquakeareaislocatedintheeasternpartofCenozoicriftedbasinoftheBohaiGulf,alongtheintersectionzonebetweentheNNE-trendingYingkou-WeifangfaultzoneandtheNW-trendingBeijing-Penglaifaultzone.IntheearlyTertiaryfault-depressionstage,threesetsoffaults,theNNE-,NW-,andW-E-trendingfaults,weredevelopedintheuppercrustinthearea.Theyarelistricandplanarintheform,ofnormalfaultcharacterandmostlythemajorfaultsinfaulteddepressions.Inthefault-depressionstagesincelateTertiary,thepreexistingfaultshaveundergonemovementtodifferentextent.Meanwhile,anewNE-trendingHuanghekou(YellowRiverMouth)-Miaoxibeifaultzonewasdeveloped.ThefocalfaultingoftheM7.4earthquake,strikingtoN45°EanddippingtoSE,isnearlyvertical,withdextralstrike-slipnature,andburieddowntodepthof15～34km.TheseismogenicfaultforthelargeearthquakeisnottheYingweifault,butthenewlygeneratedHuanghekou-Miaoxibeifault.

简介：At19:33p.monSeptember27,2003,anearthquakewithM7.9occurredintheRussiaMongolia-ChinaboundaryRegion.ItwasstronglyfeltintheAltayregionofXinjiang.Thelossescausedbytheearthquakewas76millionyuan(RMB).Someinformationabouttheearthquakewasoutlined,includingbasicparameters,focalmechanism,evaluationofearthquakedisasterlossesandsoon.Thesatelliteremotesensinginformationworkedinitialanalysisfordeformationofgroundandfailurephenomenon.

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简介：Usingthe78focalmechanismsolutionsoftheforeshocks,mainshockandaftershocksoftheearthquakesequencefortheYao'anearthquake,thecharacteristicsofthefocalfaultsandstressfieldfortheearthquakesequenceareanalyzed.TheresultsshowthatthemainruptureplaneoftheYao'anearthquakesequenceisatectonicfaultwithN50°Wstrikeandsteepdipandallthemainshock,theforeshocksandthevastmajorityofaftershocksoccurredonthemainruptureplane.AtectonicfracturewithNNE-NEstrikealsoparticipatedindevelopmentprocessofthesequencedominatedbyprincipalcompressionalstresswithnearlyhorizontalorientationSSEisconsistentwiththeregionaltectonicstressfield.Inthesequencedevelopment,thestressfieldinthefocalregionwascomplexwithmultiaximuthsandmulti-actionmodelsandthefocalruptureshowedcomplexfeatureswithmulti-directionsandmulti-patterns.

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