简介：EasternChinaandvicinalseaareas(98°~150°E,5°~50°N)arelocatedinthejunctionzoneofEurasianandPacificplates,anditisalsoprofoundlyinfluencedbythecollisionbetweenIndianandEurasianplates.Weutilizedsurfacewavedatarecordedby35digitalseismicstationsinthearea,extracteddispersioncurvesoffundamental-modeRayleighwavesalong1252pathsbymeansoftime-frequencyanalysisbasedonmultiple-filterandothertech-niques.Thestudyareawasdividedintoagridof1°′1°,groupvelocitydistributionsoffundamentalRayleighwavesbetween10~158sweredeterminedbyOccam￠sinversion.Thesevelocitydistributionsroughlydepictthelateralvariationsofshearwavevelocitiesindifferentdepthranges.WiththedeterminedpurepathdispersionswefurtherinvertedfortheSwavevelocitystructuresalongtwoprofilesfromeasternTibettoPacificOceanandfromSouthChinaSeatoMongolia.Itisfoundthatthelateralheterogeneityisobviousdownto400kmdepth,andthevelocitystructuresarecorrelatedwithtectonicunitsinthestudyarea.

简介：Morethanahalfofstrongearthquakesintheworldarelocatedinshallowdepthatthesubductingplateboundaryinsqueezedzones.Owingtothedifferenceinspeedbetweenthemovingseaplates,thestrainenergyisaccumulatedandreleasedcyclicallyinsqueezedzones.Severalmethodsweredevelopedtoanalyzethemedium-andshort-termpotentialofmainshocks.Thesemethodscanbeclassifiedinto(1)lessdatasystemsusingthetheoryofgreymodelforearthquakeprediction,(2)quasi-periodicsystemsusingearthquakeactivityanalysis,(3)systemsofgroupedactivityusingorderanalysis,and(4)nonlinearsystemsusingbackpropagation(BP)ofneuralnetworkforpredictionanalysis.Basedupontheseanalyticmethods,riskmapsforthepredictionofstrongearthquakescanbedrawnusingtherecordsofstrongearthquakesinTaiwanforthepast100years.Theseriskmapsinclude(1)aseismicriskmap,(2)alossriskmap,(3)ahazarddegreemap,and(4)alossdegreemap.Theseriskmapsmakeitpossibletodoamedium-termpredictionofmainshocksonthe10-yearscale.

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简介：Jiashi和它的包围区域由许多结构的地区组成。在Jiashi和它的包围区域使用59中等强烈的地震的焦点的机制解决方案，并且把这些与计算相结合系统簇和压力领域倒置结果，我们在不同时间和不同区域分析了压力领域的发展特征。结果如下：在Jiashi的地震主要是strike-slip.However，Kalpin块的那些主要是反向的事件，显示出地区性的特征是的明显的thrusting.The与另外的区域不同。地区性的主要压力领域的方向在NS附近。在不同构造背景下面，然而，压力地的方向是不同的。主管的方向压缩应力在在Kashi-Wuqia区域的NS附近。但是在有M7.0的3地震前后，到NS然后到有时间过程的NE的从NW的动态进化被观察。Kalpin块很长时间在NW方向由一块一致压力地被统治了。然而，Jiashi区域的压力地的方向是NE。自从1996，地区性的压力地的方向显然变化了。P轴的方向向NE被偏斜，并且plunge角度增加了。结果清楚地在不同构造环境显示出压力地的分发模式的地区性的特征和变化。

简介：TheTanlu(Tancheng-Lujiang)faultisoneofthemajorstructuresineasternChina,whichcutsacrossdifferentblocksandcontrolsthetectonicactivity.UsingtheseismicdatafromtheChinaEarthquakeNetworksCenter,weinvestigatethespatialvariationsoftheb-valueintheDabie-Sulu(Jiangsu-Shandong)organicbeltbycalculatingtheb-valueofeachgrid(1°×1°)from1970to2010.Thestudyshowsthat:theb-valueissmallerintheTanlufaultanditsadjacentarea,whichmightsuggestthatthemajorearthquakerecurrenceperiodisrelativelylongduetothelowerfrequencyofsmallearthquakeactivity.InbothsidesofTanlufault,theb-valueishigherattheedgeofSulublockandtheeasternpartofDabieorogenicbelt.ThebvaluesarehigherinNorthChinacentralorogenicbelt,andsmallearthquakeactivitywhichoccurredalongthecentralorogenicbeltisfrequent.Additionally,combinedwithgeologicalandgeophysicalstudy,wefindthattheb-valuehasacertaincorrespondencerelationshipwiththelithologicdistribution,whichinformsusthatseismicactivityfeaturesarecloselyrelatedtotheinhomogeneousmediainthecrust.

简介：论文分析seismicity的精力地的变化特征2。1ML4。5在江苏和它的附近的区域在在1970年1月和2007年12月之间的时期期间。它也分析时间的变化“重量”主要典型精力地的系数，与地震精力使用随机的功能理论基于实验直角的功能(文件结束)扩大方法作为一块时空随机功能地回答。结果证明开始的七块典型的地的扩大精确性是0。9244。地震精力的力量在学习区域在不同的构造的块显著地变化。高价值区域在中间、南部的江苏，和南方黄海。典型领域的分发也证明是一个区域最显著地影响学习区域的地震精力领域。时间开始的六个典型领域的系数与时间改变的“重量”，和变化的振幅在这个区域与中等强壮的地震有强壮的时间的关联。

简介：Theparametersofhypocentrallocationareimportantfundamentaldataforthestudyofseismologyandtheearthinteriorphysics;amongthem,thefocaldepthisaveryimportantonebutcanhardlybemeasuredwithhigherprecision.Withtheincreaseofseismicstationsinnumber,theheighteningofobservationqualityandtheimprovementofdeterminationmethod,suchasituationhasbeenchangedmuch.Inthispaper,theresultsofhypocentrallocationandre-locationby7small-aperturedigitalseismicstationnetworksatTangshan,ZhangbeiandHuailaiofHebeiProvince,DatongofShanxiProvinceandJianchuan,LuquanandYao＇anofYunnanProvinceareused.Usingtheseresultstogetherwiththoseoffocaldepthinversionbyfar-fielddataofsomeindividuallargeshocksincorrespondingareasandthosere-determinedbytheLinfentelemeteredseismicnetworkofShanxiProvince,acomparisonwiththeresultsoffocaldepthdeterminationinthepastearthquakecataloguesismade.Itisfoundoutthatthefocaldepthsdeterminedbythesmall-apertureseismicnetworksarebasicallydistributedintherangefromtheearthsurfacetoten-oddkilometersunderground.Incontrast,thefocaldepthsdeterminedinthepastaremostlydistributedatthedepthrangefromtheearthsurfaceto30kmunderground.Besides,thereisadifferenceof50%to100%betweentheaveragevaluesofthetwocases,whichisquiteanobviousone.Fromtheresultofanalysis,itisconsideredthattheresultsdeterminedbythesmall-apertureseismicnetworksmaybeclosertotherealityoffocaldepthsdistribution.Thatistosay,earthquakesintheabove-mentionedareasshouldbedistributedintheshallowpartofthecrust.Thecausesthatleadtotheabovesituationarediscussedpreliminarily,andsomesuggestionsandmeasuresforimprovingtheprecisionoffocaldepthdeterminationareputforward.

简介：Basedon49digitalseismogramsrecordedby73seismicstationsintheJiangsuTelemeteredSeismicNetwork,thepaperusesAtkinson'smethodtocalculatetheinelasticattenuationcoefficientoftheJiangsuarea.Wefindthatthefrequency-dependentQintheJiangsuregionisQ(f)=272.1·f~(0.5575).WealsouseMoya'smethodtoinvertthe63stations'siteresponses.Theresultsshowthatthesiteresponsesofthe25stationsinJiangsuareapproximately1atarangebetween1Hzand20Hz,whichisconsistentwiththeirbasementsonrocks.Theresponsecurvesofthesiteresponsesofthe14undergroundstationsaresimilartoeachother.Theirsiteresponsesshowanamplificationatlowfrequenciesandminimizationathighfrequencies.ThecalculationoftheBrunemodelonthewaveformdataofM_L≥2.5earthquakesfromJiangsuDigitalSeismicNetworkbetweenOctober2010andMay2015intermsofseismicsourceparametersof58seismicwavesshowsthattherearegoodcorrelationsbetweenseismicmagnitudeandothersourceparameterssuchasseismicmoment,sourceradiusandcornerfrequency,whilethecorrelationsbetweenseismicmagnitudeandstressdrop,andstressdropandsourceradiusarenotsogood.

简介：Basedonpreviousresearchresults,present-daycrustaldeformationandgravityfieldsintheChinesemainlandareanalyzedusingtheGPSdata,leveling,gravityandcross-faultdeformations.Weanalyzedstrainaccumulationofthemajorfaults,andidentifiedlockedorhighstrainaccumulationsegments.Combiningtheeffectsoflargeearthquakesinthestudyarea,thelong-term(decade)probabilityoflargeearthquakesintheChinesemainlandisestimated.

简介：Two-monthcontinuouswaveformsof108broadbandseismicstationsinFujianProvinceanditsadjacentareasareusedtocomputenoisecross-correlationfunction(NCF).ThesignalqualityofNCFisimprovedviatheapplicationoftime-frequencyphaseweightedstacking.TheRayleighandLovewavesgroupvelocitiesbetween1s-20saremeasuredonthesymmetricalcomponentoftheNCFwiththemultiplefiltermethod.Morethan5,000Rayleighwavedispersioncurvesandabout4,000Lovewavedispersioncurvesareobtainedandusedtoinvertforgroupvelocitymaps.Thisdatasetprovidesabout50kmresolutionthatisdemonstratedwithcheckerboardtests.Consideringtheoffgreatcircleeffectininhomogeneousmedium,theraypathistracedbasedonthetraveltimefieldcomputedwithafinitedifferencemethod.Theinvertedgroupvelocitymapsshowgoodcorrelationwiththegeologicalfeaturesintheupperandmiddlecrust.TheFuzhoubasinandZhangzhoubasinshowedlowvelocityontheshortperiodgroupvelocitymaps.Onthelongperiodgroupvelocitymaps,thelowvelocityanomalyinthehighheatflowregionnearZhangzhouandclearvelocitycontrastacrosstheZhenghe-Dapufaults,whichsuggeststhattheZhenghe-Dapufaultmightbeadeepfault.

简介：ResearchonthelargescalespatialheterogeneityofgreatintraplateshallowearthquakesontheChinesemainlandandadjacentareasdiscussedinthispapershowsthat(1)therearefourmainhighseismicityareas:theNorthChinaseismicareaintheeasternpartofChina(30°-42°N),theSoutheasternCoastseismicareaintheeasternpartofChina(19°-25°N),theNorth-SouthseismicareainthewesternpartofChinaanditsadjacentareas(Burma-China-Mongolia),andtheCentralAsianseismicareainthewesternpartofChinaanditsadjacentareas(Pamir-TianshanMountains-Baikal);(2)thefourintraplateseismicareasthatareapproximatelyperpendiculartothosesectionsoftheEurasiaplateboundarythatsurroundstheChinesemainlandanditsadjacentareas,wheretheEurasiaplatehasastrongseismiccouplingwiththeNorthAmerica-PacificOcean-PhilippineSeaplateandtheIndiaplate;and(3)thelargescalespatialheterogeneityofintraplateseismicityinChinaanditsadjacentareasthatmightbecontrol

简介：用地震断层摄影术的最近的结果，我们学习了深构造的背景中等并且在安徽省和它的附近的区域的强震(28°～39°N，112°～124°E)。结果如下：(1)在那里存在在中等强壮的地震，表面的地质的结构并且与上面外壳的速度划分活跃构造元素的地点之间的某个关联组织。记录M≥的大多数地震6.0发生在高速度的地区或在在high-velocityand之间的过渡区域在上地壳的低速度的地区。在低速度的地区的地震活动有更小的影响。发生在高速度的地区的地震主要在速度变化区域被散布。边界带和北方中国平凡断裂地块的内部是中等强壮的地震的主要活跃地点。在在块的西方、北的方面的断层盆地下面，上地壳被宽不连续的分布在low-velocityzone，并且在过渡带描绘从低--到高速度，中等强壮的seismicityshows活断层被开发的显域分布。NW-extensionZhoukou-Hefei-Xuancheng低速度的地区分开DabieshanMountainsand西方山东的高速度的地区--它毗邻thehigh速度地区的北方面上的安徽，和中等强壮的地震是相对经常的。这个低速度的地区可能是在北方中国和华南之间的一条重要、深深地组织的边界构造的省。(2)Thefrequent中等强壮的地震在Huoshan-Lu在过去和最近的小地震活动记录了“一个区域是在在Dabieshan的中央部分和通过外壳切了的深断裂的二个集合下面的中间的外壳中的一个低速度的地区的结果。(3)以深部构造，在安徽省的中等强壮的地震的分发有一个明显的地区性的特征。基于历史的地震复发间隔和深seismogenictectonics的类似物原则，在安徽Provinceare记录M_s5.0的潜在的地震风险地区决定了。

简介：OnJuly22,2013,theMinxian-ZhangxianM_S6.6earthquakeoccurredontheeastsegmentofLintan-Dangchangfault.TheanalysisofdigitalelevationandremotesensingimagingshowsthattheeastsegmentofLintan-Dangchangfaultisstillactiveandthemainthrustfeatureofthefaultswitchestoleftlateralslip.Withthefieldresearchofintensityanddamage,severalabnormalareasofdegreeⅧspreadintheisoseismallineofdegreeⅦandsomeabnormalareasofdegreeⅦspreadintheisoseismallineofdegreeⅥ.Theseabnormalareasaredistributedalongthehangingwallofthefaultinawidthof2km.TheanalysisbasedontheremotesensinganddigitalelevationmodelshowsthatthesegmentoftheLintan-DangchangfaultsouthofMinxianmainlyslipsinleftliteral.Thefaultmovementmadethesoilsoftinthefaultzone.Theearthquakemotionpropagatedalongthefaultzone.Thereforethestrongearthquakemotioncausedfoundationfailureinthesoftsoilalongthefaultzoneandtheabnormalintenseareasofdisasterformed.

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