简介：在这篇论文，锥模型在分层的土壤上被用于二个基础的颤动分析半空间。在分析，在心土的全部的应力场被划分成免费地并且散布的地。种子“s简化了方法为thefree地分析被采用，当锥模型为分析被建议时，动态散布压力波浪回答。在散布采购的有二的分层的阶层的shear应力场和压缩应力场被计算由砍锥和压缩的锥分别地。而且，在有二个基础的心土的应力场被划分成六个地区，并且P波浪和Swave在每个地区被分析。数字结果被提供在垂直、水平的正弦曲线力量刺激下面为二个表面基础说明增加的应力场的特征。建议的锥模型可能在处理一些联系散布withmulti采购的复杂问题是有用的。

简介：Ingeneral,theseismicresponseanalysisinearthquakeengineeringassumesthatthevibrationparametersofthetargetandthecontactsurfaceoftheexternalmediaareidentical,i.e.,singlepointinput.However,earthquakeenergyhasanattenuationphenomenoninwavepropagation,soawiderangeofsoilslopesandtheexternalmediumcontactsurfaceofdifferentinputpointsonmotionarenotidentical.Ifweconsidersinglepointinputonly,itmaynotcorrespondwithreality,soitisnecessarytocarryoutresearchonmulti-pointinputmethods.Basedonthe2-Dslopemodel,single-pointinputandmulti-pointinputareperformedrespectivelytoanalyzeandcomparetheirsimilaritiesanddifferencesintheperspectivesofthecharacteristicsofseismicresponseofsoillayerandplasticzonedistributiontoprovideareferencefortheseismicdesignofslopes.Theresultsshowthatintheperspectiveofsoilseismicresponseanalysis,thepeakaccelerationoutputandpeakvelocityoutputundermulti-pointinputaregreaterthanthepeakvaluesundersinglepointinputatthesamemonitoringpoint,thepeakappearingtimeisalsoearlierthanthatofthesinglepointinput;intermsoftheplasticzonedistribution,themulti-pointeffectismanifestedasthepresenceofmoreobvioustensileshearfailures;intheperspectiveofsafetycoefficient,thesafetycoefficientundereachmulti-pointinputissmallerthanthatofsinglepointinput,adifferenceofabout7%orso.Insummary,multi-pointinputismorereasonableandpracticalthansinglepointinput,somulti-pointinputshouldbeconsideredinseismicdesign.

简介：ThegeomagneticdatarecordedbyKashiandJinghaiobservatoriesinChinawereanalyzedwithimprovedpolarizationmethod.Wecomparedtheresultaround0.01HzwhichisthoughttobeusefultodetecttheULFanomalywiththeresultaround0.1Hzwhichwasinferredfromtheearthquakedepthaccordingtotheskineffect,andfoundthat0.1HzismorepropertodetecttheULFanomalyforbothearthquakesstudiedinthispaper.

简介：Inthispaper,accordingtotheFujianSeismicNetworkearthquakecatalogrecords,theTnowmethodandtheFourStationsContinuousLocationmethod(hereinaftercalledFSCL)putforwardbyJinXingareinspectedbyusingP-wavearrivalinformationofthefirstfourstationsofeachseismicevent.Resultsshowthatforearthquakeswithinthenetwork,bothmethodscanobtainsimilarlocationresultsandlocationdeviationsaresmallforthemajorityoftheevents.Forearthquakesoutsidethenetwork,thelocationdeviationmaybeamplifiedastheepicentraldistanceincreases,owingtotheseismicstationdistributionwhichspreadtowardthesideoftheepicenterandthesmallopeninganglebetweenseismicstationsusedforlocatingandepicenter.FortheFSCLmethod,theimpactsofthewavevelocityonthelocationresultsmaybesignificantforearthquakesoutsidethenetwork.Thus,selectingavelocitymodelwhichissimilartotheactualstructureofthewavevelocitywillcontributetoimprovinglocationresultsofearthquakes.TheFSCLmethodcanlocatemoreseismiceventsthantheTnowmethod.ItconcludesthattheTnowmethodmakesuseofmistakeinformationfromsomenon-triggeringstationsinearthquakecatalog,andsomeP-wavearrivalsarenotincludedintheearthquakecatalogduetodiscontinuousrecordsorunclearrecordsoftheseismicphase,whichinducesincorrectlocation.

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简介：在这研究，一条新分析途径被开发分析保守two-degree-of-freedom(TDOF)的免费非线性的颤动系统。这些系统的数学模型被秒顺序管理非线性的部分微分方程。非线性的微分方程被使用一些中间的变量变成一个单个方程。单个非线性的微分方程被使用Hamiltonian途径的第一份订单解决(哈)。不同参数，在系统的反应上有重要影响，被考虑并且讨论。一些比较被介绍验证在Hamiltonian途径和准确答案之间的结果。最大的相对错误是为颤动的大振幅的不到2.2124%。Hamiltonian途径的第一次重复完成很精确的结果，这被建立了，不要求任何小不安，并且能被用于大量非线性的问题。

简介：Afamilyofunconditionallystabledirectintegrationalgorithmwithcontrollablenumericaldissipationsisproposed.Thenumericalpropertiesofthenewalgorithmsarecontrolledbythreeparametersα,βandγ.Bytheconsistentandstabilityanalysis,theproposedalgorithmsachievethesecond-orderaccuracyandareunconditionallystableundertheconditionthatα≥-0.5,β≤0.5andγ≥-(1+α)/2.Comparedwithotherunconditionallystablealgorithms,suchasChang’salgorithmsandCRalgorithm,theproposedalgorithmsarefoundtobesuperiorintermsofthecontrollablenumericaldampingratios.Theunconditionalstabilityandnumericaldampingratiosoftheproposedalgorithmsareexaminedbythreenumericalexamples.Theresultsdemonstratethattheproposedalgorithmshaveasuperiorperformanceandcanbeusedexpedientlyinsolvinglinearelasticdynamicsproblems.

简介：Smoothedparticlehydrodynamics(SPH)isamesh-freeadaptiveLagrangianparticlemethodwithattractivefeaturesfordealingwiththefreesurfaceflow.ThispaperappliestheSPHmethodtosimulatethelarge-amplitudelateralsloshingbothwithandwithoutafloatingbody,andtheverticalparametrically-excitedsloshinginatwo-dimensionaltank.ThenumericalresultsshowthattheSPHapproachhasanobviousadvantageoverconventionalmesh-basedmethodsinhandlingnonlinearsloshingproblemssuchasviolentfluid-solidinteraction,andflowseparationandwave-breakingonthefreefluidsurface.TheSPHmethodprovidesanewalternativeandaneffectivewaytosolvethesespecialstrongnonlinearsloshingproblems.

简介：Thecorrelationofthescaledenergy,e?=Es/M0,versusearthquakemagnitude,Ms,isstudiedbasedontwomodels:(1)Model1basedontheuseofthetimefunctionoftheaveragedisplacements,withax-2sourcespectrum,acrossafaultplane;and(2)Model2basedontheuseofthetimefunctionoftheaveragedisplacements,withax-3sourcespectrum,acrossafaultplane.Forthesecondmodel,therearetwocases:(a)Ass*T,wheresistherisetimeandTtherupturetime,lg(e?)*-Ms;and(b)AssT,lg(e?)*-(1/2)Ms.Thesecondmodelleadstoanegativevalueofe?.ThismeansthatModel2cannotworkforstudyingthepresentproblem.TheresultsobtainedfromModel1suggestthatthesourcemodelisafactor,yetnotauniqueone,incontrollingthecorrelationofe?versusMs.

简介：二斜角肌的Antiplane反应由嘘波浪的三角形的山和一个半圆柱的峡谷用波浪功能扩大和复杂功能方法被学习。第一，分析模型被划分成三部分，和波浪领域的排水量答案在三个区域基于边界条件被构造。三个领域然后被结合在分享的边界满足连词条件。另外，与半圆柱的峡谷的零压力的条件结合了，为这个问题的一系列无限的代数学的方程被导出。最后，数字例子被提供，地面运动上的不同参数的影响被讨论。

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简介：Thesatelliteremotesensinghasbecomeapromisingtechniquefordetectingearthquakeandfaultactivities.Butitisstillverydifficulttoexactlyextracttheearthquakeanomalyfromthecomplicatedremotesensinginformation.Thispaperpresentedatwo-stepmethodtoextracttheseismicmicrowaveradiationanomalyrelatedwithearthquake,whichcouldeliminatethestableinfluenceofgeography,terrain,coversphereandseasons,aswellastherandominfluenceofweather.Furthermorethetwo-stepmethodwasappliedtoanalyzetheanomalyofWenchuanearthquakebasedonthedataofAMSR-E.Microwaveradiationanomalieswereeffectivelydetectedrelatedtothemainshockandaftershocks.Theextractedmicrowaveradiationvariationshowedgeneralfeaturesofthree-stage:thepositiveradiationanomalyappearedaroundtheepicenterinthefirststage,quietvariationinthesecondstage,andabnormalareagraduallymovedtotheepicenterinthethirdstage.AfterthemainshockthemicrowaveradiationanomaliesdistributedalongtheLongmenshanfaults,andtheepicentersofaftershockswerecoincidentwiththeanomalyareainspace.

简介：

简介：Weemployedadouble-differencealgorithm(hypoDD)torelocateearthquakeswithintheregionboundedby66°E-78°Eand32°N-42°Nintheperiodof1964?2003reportedbytheInternationalSeismologicalCenter(ISC).Theimprovedhypocentrallocationsdelineateadouble-layeredWadati-BenioffzoneintheeasternHinduKushintermediateseismicbelt.Basedonthisfeatureandotherevidences,weproposethattheintermediate-depthearthquakesbeneaththePamir-HinduKushregionmayoccurintwocollidedsubductionzoneswithoppositedipdirections.

简介：Wepresentaparallelhybridalgorithmbasedonpseudospectralmethod(PSM)andfinitedifferencemethod(FDM)fortwo-dimensional(2-D)globalSHwavefieldsimulation.Thewhole-EarthmodelistakenasacrosssectionofsphericalEarth,andcorrespondingwaveequationsaredefinedin2-Dcylindricalcoordinates.SpatialderivativesinthewaveequationsareapproximatedwithefficientandhighaccuracyPSMinthelateralandhigh-orderFDMintheradialdirectiononstaggeredgrids.Thisalgorithmallowsustodividethewhole-Earthintosub-domainsinradialdirectionandimplementefficientparallelcomputingonPCcluster,whileretainshighaccuracyandefficiencyofPSMinlateraldirection.Atransformationofmomenttensorbetween3-DsphericalEarthandour2-Dmodelwasproposedtogivecorrespondingmomenttensorcomponentsusedin2-Dmodeling.Comparisonofmodelingresultswiththoseobtainedbydirectsolutionmethodshowsverygoodaccuracyofouralgorithm.Wealsodemonstrateitsfeasibilitywithalateralheterogeneouswhole-Earthmodelwithlocalizedvelocityperturbation.

简介：Inviewofthecorrelationbetweentectonicactivityandseismicity,thestrongearthquakeriskintheNorth-SouthSeismicBeltarousedwideconcernafterthe2014YutianM_S7.3earthquake.UsingtheseismiccatalogoftheChinaEarthquakeNetworksCenter,theBenioffstrainratiointheNorth-SouthSeismicBeltiscalculatedin30daysbeforeandaftertheMarch21,2008andFebruary12,2014YutianM_S7.3earthquakes.Resultsshowthatinayearafterthe2008YutianM_S7.3earthquake,M>5.0earthquakesalloccurrednearthehighstrainratioareaorthejunctionbetweenthelowandhighstrainratioareas,theactivityofstrongearthquakesobviouslycoincideswiththehighstrainratioarea,whichindicatesthattheseareashaveahigherstresslevel.TheYutianearthquakespromotedthereleaseofsmallearthquakesinthehighstressareas.Thisresearchisofcertainindicatingsignificancetothestudyofsubsequentstrongearthquakesofthisregion.