简介：Macroscopicanomaliesfrom"EarthquakeCasesinChina"arestatisticallyanalyzedinthispaper.Theconclusionisasfollows:Theprobabilityofoccurrenceofmacroscopicanomaliesbeforeearthquakesincreaseswithmagnitude.Thelargertheearthquakemagnitude,themoremacroscopicanomaliesappear.Thetemporaldistributionofmacroscopicanomaliesisasfollows:Therearefewmacroscopicanomaliesatbeginning;astimegoeson,thenumberofmacroscopicanomaliesincreases;theincreaseofmacroscopicanomalyquantityaccelerateswiththeimpendingearthquakeandreachesaclimaxwhentheearthquakebreaksout.Thespatialdistributionpatternofmacroscopicanomaliesisasfollows:macroscopicanomaliesappearattheepicenteratthebeginning,thenspreadout,andfinallyariseexplosivelyattheepicenterarea.

简介：Accordingtotheresultsofsiteseismichazardanalysisaccomplishedinthepastdecades,96site-relateddesignspectraareselectedassamplesinthisstudy.Theresultshowsthatthevalueofthecornerperiod(Tg)ofthedesignspectruminGBJ11-89(ChinaSeismicBuildingCode,issuedin1989)islowerthanthevalueobtainedbysiteseismichazardanalysis.ThesamesituationexistswhenwecomparethedesignspectraoftheCodestothespectraaccordingtotheearthquakerecords.Thevalueincurrentseismicdesigncode,GBJ50011-2001issuedin2001,isgreaterthanthatinGBJ11-89,butstilllessthanthevalueobtainedbysiteseismichazardanalysis.Ifweacceptthevaluegotbysiteseismichazardanalysis,wehaveasuspicionthat2/3ofbuildingsbuiltaccordingtoGBJ11-89willnotbesafewhenanearthquakewith2%probabilityofexceedancein50yearsoccurs.

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简介：AstatisticalanalysisoftectonicenvironmentforM≥6.0strongearthquakesinChina'scontinentsincethebeginningofrecordedhistoryisperformedbasedonthedataofactivefaultsstudiedduringlast10yearsandresultofcompilationofthefourthversionoftheMapofSeismicRegionalizationofChinaforEarthquakeProtection.Tectonictypesofseismicsourcesofstrongearthquakesinallseismicregionsandthemovementmodesofseismogenicstructuresarediscussed.Meanwhile,ananalysisoflengthsofsurfacerupturezonesproducedbyalltypesofearthquakes,orientationsoflongaxesofmeizoseismalareas,regionaltectonicstressfieldsinseismicsourceregionsforstrongearthquakes,geophysicalfields(gravityanomaly,highconductivitylayeranomaly,andterrestrialheatflowdensity),andrecentverticalcrustaldeformationfieldshavebeencarriedout.

简介：ThispaperisrelatedtostudyoftheiondensityrecordedbythelowaltitudesatelliteDEMETER.Itwillpresentionosphericperturbationsobservedduringlargeseismicevents.Astheionosphereishighlyvariable,thepaperwillshowastatisticalanalysisperformedontheplasmaparametersduringnighttime.Analgorithmhasbeenimplementedtodetectcrestsandtroughsinthedatabeforeworld-wideearthquakes.Theearthquakeshavebeenclassifieddependingontheirmagnitude,depth,andlocation(land,belowthesea,closetoacoast).Duetotheorbit,DEMETERreturnsabovethesameareaeveryday(onceduringdaytime,onceduringnighttime)butnotatthesamedistanceofagivenepicenter.Then,foreachearthquake,datahavebeencheckeduntil15daysbeforetheshockwhenthedistancebetweenthetraceoftheorbitandtheepicenterislessthan1500km.Theresultsofthestatisticalanalysisarepresentedasfunctionsofvariousparameters.Acomparisonisdonewithtwootherdatabaseswhere,ononehand,thelocationoftheepicentershasbeenrandomlymodified,andontheotherhand,thelongitudeoftheepicentershasbeenshifted.Resultsshowthatthenumberandtheintensityoftheionosphericperturbationsarelargerpriortoearthquakesthanpriortorandomevents,andthattheperturbationsincreasewiththemagnitude.

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

简介：Ａｐｐｌｉｃａｔｉｏｎｏｆｍｅｃｈａｎｉｃａｌａｎｄｓｔａｔｉｓｔｉｃａｌｍｏｄｅｌｓｔｏｔｈｅｓｔｕｄｙｏｆｓｅｉｓｍｉｃｉｔｙｏｆｓｙｎ－ｔｈｅｔｉｃｅａｒｔｈｑｕａｋｅｓａｎｄｔｈｅｐｒｅｄｉｃｔｉｏｎｏｆｎａｔｕｒａｌｏｎｅｓＹＡＯ－ＬＩＮＳ...

简介：Anovelstructuraldamagedetectionmethodwithanewdamageindex,i.e.,thestatisticalmoment-baseddamagedetection(SMBDD)methodinthefrequencydomain,hasbeenrecentlyproposed.TheaimofthisstudyistoextendtheSMBDDmethodinthefrequencydomaintothetimedomainforbuildingstructuressubjectedtonon-Gaussianandnon-stationaryexcitations.TheapplicabilityandeffectivenessoftheSMBDDmethodinthetimedomainisverifiedbothnumericallyandexperimentally.Shearbuildingswithvariousdamagescenariosarefirstnumericallyinvestigatedinthetimedomaintakingintoaccounttheeffectofmeasurementnoise.Theapplicabilityoftheproposedmethodinthetimedomaintobuildingstructuressubjectedtonon-Gaussianandnon-stationaryexcitationsisthenexperimentallyinvestigatedthroughaseriesofshakingtabletests,inwhichtwothree-storyshearbuildingmodelswithfourdamagescenariosaretested.Theidentifieddamagelocationsandseveritiesarethencomparedwiththepresetvalues.Thecomparativeresultsarefoundtobesatisfactory,andtheSMBDDmethodisshowntobefeasibleandeffectiveforbuildingstructuressubjectedtonon-Gaussianandnon-stationaryexcitations.

简介：弄弯的钢桥通常在这些结构的网络和更多继续在美国设计并且造的交通在交换被使用。尽管这些桥的使用继续在高经历seismicity的地点增加，他们的地震行为上的弯曲和另外的参数的效果在当前的风险评价工具中被忽视了。这些工具能用脆弱曲线评估一个交通网络的地震危险。为弄弯的钢桥的脆弱曲线开发的一个批评部件是帮助识别与他们的地震反应有关的有影响的参数的敏感分析的结束。在这研究，存在的可存取的库存弄弯首先位于中间大西洋的美国(MAUS)的钢girder桥被用来建立为地震敏感研究用作输入的统计特征。批评地震反应数量用非线性的有限元素建模的3D被捕获。从这些数量的有影响的参数用统计工具被识别，它包括了Pareto合并试验性的Plackett缅甸人设计(PBD)最佳的阴谋和预言剖析程序技术。调查结果表明在包括的有影响的参数的潜在的变化跨度，弯曲的半径，最大的跨度长度，girder间距，和跨框架的间距数。这些参数显示出对批评的桥反应的影响的变化层次。

简介：AstatisticalanalysisonearthquakeactivityintheKashi-WuqiaintersectionareatriggeredbyearthtideisdonebySchusterstestandthePermutationtestondailyandmonthlyscales.Thenorth-south,east-westcomponentofthetidalforceandtidalbodystressarechosenasthetidalcurveinthedailyscale.Theresultsshowthatmostoftheearthquakesoccurrednearthemaximum0°ofthethreekindsoftidalcurves,thepredominanttidalphasesoftheearthquakeare-5.86°,6.60°and-15.52°,andthefrequencyoftheearthquakesincreaseswiththeincreaseofthetide;withthreekindsoftidalcurves(thenorth-south,east-westcomponentofthetidalforceandtidalbodystress),thepSofSchusterstestforalltheearthquakesis10.52%,2.40%and2.06%,andthepPofthePermutationtestis10.90%,2.40%and2.06%,andtheresultsofpSandpPbasedontheeast-westcomponentofthetidalforceandtidalbodystressarebelowthethresholdof0.05thattidaltriggeringofearthquakes.Inthemonthlyscale,boththepSandpPareverylow(closeto0),farbelowthethresholdof0.05oftidaltriggeringofearthquakes,andthepredominanttidalphaseforearthquaketriggeringis-18.95°,closetothemaximum0°(newmoonandfullmoon)oftheearthtideinmonthlyscale.Regardingthestatisticaltestresultoftidaltriggeringofearthquakes,apreliminaryexplanationisgivenastowhythetriggereffectintheeast-westdirectionisgreaterthanthatinnorth-southdirection.

简介：Inordertounifythetimeandthespaceattributesintotemporal-spatialdistance,thetemporal-spatialproportionalcoefficientfTSisproposedinthispaper.Inaccordancewiththenewdistanceconcept,thetemporal-spatialcorrelativitywithintemporaldoubletsofstrongearthquakesinNorthChinaanditsvicinitysinceAD1500hasbeenanalyzed.ThecomputationresultsindicatethatdoubletsofstrongearthquakecanbedividedintotwogroupswhenfTSisendowedwith10km/ainthenewdistanceformula.Thetemporal-spatialdistancebetweentwopointsofdoubletgenerallycannotexceed140kmwhentwostrongquakesindoublethavesomecausativerelation.Andthosedoubletswithtemporal-spatialdistanceexceeding280kmareprobablyindependentseismiceventsindoublets.Thischaractercanbethereferencetothemigrationlawsummarizationandtrendprediction.

简介：关于记录M≥的地震5.0那从1970～发生在Qinghai-Xizang(西藏)块的中间的北部分2003，在这研究，我们通过4个参数在主要震动前描述弱震和改进和他们的地震活动的异常静止的时间、空间的集中化特征，它基本上没被相关：地震时间集中化度参数C_t，地震空间集中化度参数C_d，η值和弱震频率等等。根据计算结果，在有M≥的地震前，5.0发生在Qinghai-Xizang(西藏)块的中间的北部分，这被看见了，弱震oftenshows的频率上升并且落下，他们的力量证明有时空的明显的改进和集中化分发是明显的。