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简介：1.SURVEYOFGLOBESEISMICITYIN2004Atotalof19strongearthquakeswithMs≥7.0occurredintheworldaccordingtotheChineseSeismicStationNetworkin2004(Table1).ThestrongestearthquakewastheSumatraearthquakewithMs8.7nearthenorthwestcoastofSumatraonDecember26(Fig.1).Globalseismicitymaintainsthesamepatternsfromrecentyears,beingdistributedmainlyonthewesternpartofthecircum-Pacificseismiczone.RemarkablemacroseismicactivitieswereseenintheIndia-AustralianplateandintheJapanregion.ThemacroseismicactivitiesofMs≥7.0in2004wereasfollows:

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简介：计算了2004年6月甘肃临泽地区发生的震群前的两种地震学参数——尾波Q值和地震空间相关长度，得到两种参数随时间的变化进程，并与已经研究过的震例进行对比，讨论了这两种地震学参数在地震预报方面的应用价值。

简介：Weuseinterferometricsyntheticapertureradar(InSAR)andbroadbandseismicwaveformdatatoestimateasourcemodelofthe11thJuly,2004MW6.2Zhongbaearthquake,TibetofChina.ThiseventoccurredwithintheseismicallyactivezoneofsouthwesternTibetanPlateauwheretheeast-westextensionoftheuppercrustisobserved.BecauseoflimitationsinonepairofInSARdataavailable,therearetrade-offsamongcentroiddepth,ruptureareaandamountofslip.Availableseismicdatatightlyconstrainthefocalmechanismandcentroiddepthoftheearthquakebutnotthehorizontallocation.Together,twocomplementarydatasetscanbeusedtoidentifytheactualfaultplane,betterconstraintheslipmodelandeventlocation.Wefirstuseregionalseismicwaveformtoestimatepointsourcemechanism,thenInSARdataisusedtoobtainbetterlocation.Finally,ajointinversionofteleseismicP-wavesandInSARdataisperformedtoobtainadistributedmodel.Ourpreferredpointsourcemechanismindicatesaseismicmomentof～2.2×1018N·m(～MW6.2),afaultplanesolutionof171°(342°)/42°(48°)/-83°(-97°),correspondingtostrike/dip/rake,andadepthof11km.Thefaultplanewithstrikeof171°anddipof42°isidentifiedastherupturedfaultwiththeaidofInSARdata.Thepreferredsourcemodelfeaturescompactareaofslipsbetweendepthof5-11kmand10kmalongstrikewithmaximumslipamplitudeofabout1.5m.

简介：　　Illustration　　Allthedatainthiscatalogarechosenfromthe″PreliminarySeismologicalReportofChi-neseSeismicStations″(Itsabbreviationis″MonthlyReport″).ThecatalogincludestheeventsofM≥4.7inandnearChinaandM≥6allovertheworld.The″MonthlyReport″ismonthlycompiledbytheNinthSectionofInstituteofGeophysics,CSB.　　……

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