简介：Inthispaper,thefocusdepthdistributionofearthquakeswitheachmagnitudehasbeenanalyzed.Statisticdatashowthatthelowermagnitudeis,thewiderfocusdepthdistributes.Withlargermagnitude,thefocustendstobeconcentratedinupperormiddlecrustallayers.Weanalyzedthecauseoffocusdepthdistributionandexplainedtheprecursormechanismofsmallandmoderateearthquakeswithoccurringconditionandcharacteristicsofstrongearthquakes.Theresultsofthispapermaybeappliedtodeterminerisksitesofstrongearthquakes.

简介：Onthebasisof10935broadbandvelocityrecordsof135earthquakes(ML3.0-6.4andepicentraldistanceof26-623km)occurredfromMay12toJune10in2008,whicharecollectedfrom27bedrockstationsincludedinSichuanEarthquakeMonitoringNetwork,thecorrespondingaccelerationrecordsareobtainedbyareal-timesimulationmethod.Thenbyregressionanalysisonthedata,therelationbetweenthepeakgroundaccelerationandvelocityattenuationofsmallandmoderatebedrockearthquakesoccurredinSichuanregionisacquired.AndtherelationisverifiedbyaM4.8earthquaketookplacerecentlyinWenchuan.Finally,theattenuationrelations,whicharecoincidenttothegeologicalconditionsinSi-chuanregion,areproposedbystudyingtherecordsfromSichuanearthquakenetwork.

简介：Inthisarticle,werelocatedtheseismicsourcelocationoftheearthquakesintheMuliareaofSichuan,invertedthefocalmechanismofthelargerearthquakesandanalyzedtherelationshipbetweenthewaterleveloftheJinpingreservoirandthefrequencyoftheearthquakeswarm.Theresultsshowthat:(1)Theepicentersoftherelocatedsmallearthquakeswarmsaredistributedinaseismiczone,andtheearthquakefocaldepthswereintherangeof0-12km.(2)Byanalyzingtheearthquakeswarmspatialdistribution,wefoundthattheswarmsweregeneratedbyonebranchfaultonthewestofXiaojinhefault.(3)Thefocalmechanismofthethreeearthquakeswithmagnitudegreaterthan4.0issignificantlydifferent,withtheshallowsourcethrusteventsaffectedbyverticalstress,andthestrike-slipeventsarerelatedtoregionalstresstectonicactivity.

简介：Thechangelawsofintensityofnearly200moderate-smallearthquakeswithMs=2.0~5.5occurringontheChinesemainlandsince1954havebeenanalyzedandarecomparedwiththatofmoderatelystrongearthquakes(Ms≥5.0).Theresultsshowthatthereisquiteobviousregionalityinthestatisticallawsbybothmoderate-smallearthquakesandmoderatelystrongearthquakes:attenuationofintensityinEasternChinaisslowerthanthatinWesternChinaandtheratioofthemajoraxistotheminoraxisofiso-seismallinesinEasternChinaissmallerthanthatinWesternChina.Theresultsalsoshowthatforafixedmagnitudetheattenuationofintensityofmoderate-smallearthquakesisfasterwhenintensityishigherthanV+andslowerwhenintensityislowerthanV-incomparisonwiththatofmoderatelystrongearthquakes.Furthermore,therealsohavebeensomedifferencesintheaspectsasintensity-magnituderelationbetweenstatisticallawsofmoderate-smallearthquakesandmoderatelystrongearthquakes.Thesedi

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简介：ＳｔｕｄｙｏｎｄｅｔｅｒｍｉｎａｔｉｏｎｏｆａｖｅｒａｇｅｓｔｒｅｓｓｔｅｎｓｏｒｉｎＳｈａａｎｘｉｒｅｇｉｏｎｂｙｕｓｉｎｇｓｍａｌｌｅａｒｔｈｑｕａｋｅｄａｔａＸｉｎｇ－ＸｉｎＤＵ（杜兴信）；ａｎｄＣｈｕｎ－ＳｈｅｎｇＺＨＡＮＧ（张春生）（Ｓｅｉ...

简介：13earthquakeswithM≥5.0havebeenrecordedinthenortheastregionofChinasince1970,amongwhicheightmedium-strongearthquakesareindependentinspaceandtime.Studiesofseismicitybeforetheseeightmedium-strongearthquakesshowthatsmallearthquakeactivitywasenhancedbeforetheoccurrences.ThoughseismicityincreaseisacommonphenomenoninthenortheastChinaregion,wehavedifficultyinpredictingthemedium-strongearthquakesbythisphenomenonalone.Inordertopredictmedium-strongearthquakesthroughseismicityincrease,thispapertriestoproposeanewmethodthatcalculatessmallearthquakefrequencythroughthechangingpatternofsmallearthquakeactivitiesbasedonthecharacteristicsofsmallearthquakeactivityinthenortheastChinaregion.Theresultsshowthatwecangettheobviousanomalyfrequencyofsmallearthquakesbeforemedium-strongearthquakesthroughthenewmethod,andcanobtainamediumtoshorttermanomalyindexforthenortheastChinaregion.

简介：Inthepaper,sourcemechanismsof33small-moderateearthquakesoccurredinYunnanaredeterminedbymodelingofregionalwaveformsfromYunnandigitalseismicnetwork.TheresultshowsthatmostearthquakesoccurredwithinorneartheChuandianrhombicblockhavestrike-slipmechanism.TheorientationsofmaximumcompressivestressesobtainedfromsourcemechanismarechangedfromNNW-SSNtoNSintheareasfromnorthtosouthoftheblock,andtensilestressesaremainlyinENE-WSWorNE-SE.IntheeasternTibetanPlateau,theorientationsofmaximumcompressivestressradiatetowardoutsidefromtheplateau,andthetensilestressorientationsmostlyparalleltoarcstructures.Near28°Ntheorientationsofbothmaximumcompressivestressandtensilestresschangedgreatly,andtheboundaryseemstocorrespondtothesouthwesternextendedlineofLongmenshanfault.OutsideoftheChuandianrhombicblock,theorientationsofPandTaxesaresomedifferentfromthosewithintheblock.Thecomparisonshowsthatthesourcemechanismofsmall-moderateeventspresentedinthepaperisconsistencewiththatofmoderate-strongearthquakesdeterminedbyHarvardUniversity,whichmeansthesourcemechanismofsmall-moderateeventscanbeusedtostudythetectonicstressfieldinthisregion.

简介：Takingthenortheastseismiczoneasanexampleandbasedonthemagnitude-frequencydistributionprinciplesoftheG-RrelationshipandthestudyonthetemporalandspatialdistributioncharacteristicsoftheminimummagnitudeofcompletenessMCineachtimeinterval,thispapermakesastatisticalanalysisontheseismicityparametersoftheresearchareaandexplorestheinfluenceofthecompletenessofsmallearthquakedataontheseismicityparametersandseismichazardanalysis.Itshowsthatthecompletenessanalysisoftheregionalsmallearthquakesdataprovidesapossiblemeansforobtainingmoreaccurateseismicityparametersthatcanbetterrepresenttheactualregionalseismicitylevelforareasoflowseismicity.Theresearchmethodsofthisarticleanditsconclusioncanbeusedasareferenceforthecompletenessanalysisofearthquakedataandseismicactivityresearch.

简介：这研究介绍被扩大提供混合模拟(数字试验性的集成)的一个数字多尺度的模拟框架。框架与一种标准化数据交换格式被提高并且与与实验室设备和严峻的配置的各种各样的类型便于通讯的一个概括控制器接口程序连接了。一个小规模的试验性的节目用验证建议框架并且为shearcritical的小规模的测试提供另外的数据的水力的测试设备增强了的六degree-of-freedom被进行具体结构。标本在模仿地震力量的一个颠倒的周期的装载条件下面以一种多轴的混合模拟方式被测试。物理模型是一根横梁和二柱的1/3.23-scale代表。一种混合类型建模技术被采用分析结构的剩余物。混合模拟结果对从大规模测试和有限元素分析获得的那些被比较。如果措施在准备模型材料被采取并且如果砍相关的机制精确地在数字模型，被考虑，学习发现了那小规模的混合模拟能足够地模仿砍批评的结构的行为。尽管学习的调查结果是有希望的，另外的测试数据被要求得出一般结论。

简介：AdenseseismicnetworkwasinstalledinthecapitalregionofChinainrecentyears,whichmakesitpossibletoresolvethefocalmechanismsofsmallearthquakes.Wegatheredlargeearthquakefocalmechanismsfromthelastfiftyyearsandmoderateorsmallearthquakefocalmechanismsfrombetween2002and2004,andcalculatedthepresenttectonicstressfieldofthecapitalregionbythegridsearchmethod,whichweighsdifferentsizedearthquakesandcanimprovetheaccuracyofthestressfieldinversion.Theanalysisofinversionresultsofdifferentsub-regionsshowsthattheazinuthofthemaximumprincipalcompressivestressaxisisNE43°-86°intheBeijing-Zhangjiakou-Datongarea,NE38°-86°intheTangshanarea,andNE79°-81°intheXingtaiarea.Inversionresultsofthispaperaresimilartopreviousresults,whichprovesthecorrectnessoftheapproach.Asrevealedbytheresults,thestressfieldofthecapitalregionischaracterizedbyoverallconsistencyandsub-regionaldifferences.Thisstudyprovidesreferenceforearthquakemechanismexplanationandgeodynamicsresearch.

简介：自从其22相对独立于另外的中等强壮的地震的1980，有女士5.0的26地震在Qinghai-Xizang(西藏)块的东北边缘被记录了。关于在22中等强壮的地震前的小地震活动的增加的研究显示了那项小地震活动在17中等强壮的地震前被提高。尽管增加的seismicity是在Qinghai-Xizang(西藏)块的东北边缘的普通现象，我们在由这现象预言中等强壮的地震有困难。以便通过小地震的增加的seismicity预言中等强壮的地震，这篇论文试图建议一个新方法，它通过小地震的分发模式的变化计算小地震频率基于在东北Qinghai-Xizang(西藏)块的小地震活动的特征，然后做主要应用。结果证明我们能通过新方法在中等强烈地震前在小地震的频率获得明显的异例，与这个小地震频率异例的振幅上的小空间范围效果。我们能获得对为在Qinghai-Xizang(西藏)块的东北边缘的中等强壮的地震的短期的异例索引中间。

简介：ThegreatSanhe-PingguM8earthquakeoccurredin1679wasthelargestsurfaceruptureeventrecordedinhistoryinthenorthernpartofNorthChinaplain.Thisstudydeterminesthefaultgeometryofthisearthquakebyinvertingseismologicaldataofpresent-daymoderate-smallearthquakesinthefocalarea.Werelocatedthoseearthquakeswiththedouble-differencemethod.Basedontheassumptionthatclusteredsmallearthquakesoftenoccurinthevicinityoffaultplaneoflargeearthquake,andreferringtothemorphologyofthelongaxisoftheisoseismallineobtainedbythepredecessors,weselectedastrip-shapedzonefromtherelocatedearthquakecatalogintheperiodfrom1980to2009toinvertfaultplaneparametersofthisearthquake.Theinversionresultsareasfollows:thestrikeis38.23°,thedipangleis82.54°,theslipangleis-156.08°,thefaultlengthisabout80km,thelower-boundarydepthisabout23kmandtheburieddepthofupperboundaryisabout3km.ThisshowsthattheseismogenicfaultisaNNE-trendingnormaldip-slipfault,southeastwalldownwardandnorthwestwalluplift,withtheright-lateralstrike-slipcomponent.Moreover,thesurfacerupturezone,intensitydistributionoftheearthquakeandseismic-wavevelocityprofileinthefocalareaallverifiedourstudyresult.

简介：在地球旋转和1975Haicheng，辽宁Ms7.3地震，2008Wenchuan，四川Ms8.0地震和2004苏门答腊Msg之间的关系。在他们以前发生在震中区域附近的0地震，以及中等小的地震在这研究被调查。获得的结果能有益于在地球旋转和地震之间的关系的进一步的理解。

简介：Usingatimeseriesmethodthatcombinesboththepersistentscattererandsmallbaselineapproaches,weanalyzed9scenesEnvisatASARdataovertheL’Aquilaearthquake,andobtainedaShocke’sdisplacementfieldanditsevolutionprocesses.Theresultsshowthat:(1)EnvisatASARclearlydetectedthewholeprocessesofdisplacementfieldoftheL’Aquilaearthquake,anddistinctvariationsatdifferentstagesofthedisplacementfield.(2)Preseismiccreepdisplacement?displacementmutationwhenfaulting?constantlysloweddownaftertheearthquake.(3)Theareaofthestrongestdeformationandgroundrupturewasalow-lyingovaldepressionregiontothesoutheast.Surfacefaultingwithinazoneofabout22km914km,withanorientationof135°,occurredalongtheNW-strikingandSW-dippingPaganica-S.Demetrionormalfault.(4)Inanalyzinganareaofabout54km959km,boundedbynorth–southaxistotheepicenter,thedisplacementfieldhassignificantcharacteristicsofawatershed:westwardoftheepicentershowsupliftwithmaximumof130mminline-of-sight(LOS),andeastoftheepicenterwasaregionwith220mmofmaximumsubsidenceintheLOS,concentratingontherupturezone,themajorityofwhichformedinthecourseoffaultingandsubsequence.

简介：把压成薄片的弹性体的轴承广泛地在中国为small-to-medium-span高速公路桥被使用了，在哪个水泥砍钥匙横着被设置禁止大girder排水量。为了评估，更精确地衔接地震回答，轴承的合适的分析模型并且砍钥匙应该被开发。基于一系列周期的装载实验和分析，把压成薄片的弹性体的轴承的清醒的分析模型并且砍钥匙，能考虑机械降级，被开发。机械降级的效果被在大量山峰地面加速(针网阵列)下面在横向的方向检验一座small-to-medium-span桥的地震反应调查。为small-to-medium-span高速公路桥的损坏机制被决定，它能在最近的年里在地震期间解释地震损坏调查。把压成薄片的弹性体的轴承的机械性质将由于磨擦降级滑动的试验性的结果表演，而是减少的度依赖于影响参数。这能被结束把压成薄片的弹性体的轴承的机械降级并且砍钥匙在桥的地震反应起一个重要作用。把压成薄片的弹性体的轴承的机械性质的降级并且砍钥匙应该被包括评估更精确的桥牌地震性能。

简介：TakingthesouthernpartoftheShanxiProvinceandthewesternpartoftheSichuanProvinceastheexamples,theseismicityparametersofeverypotentialseismiczonehavebeendeterminedbythemaximumlikelihoodmodelwithdifferentdatabasedondifferentmagnitudethresholds,dependingonthedifferentprecisionofdifferentearthquakecatalogs.Accordingtothegeneralseismicriskanalysismodel,theseismicintensityzoningfortwoareashasbeenobtained.