简介：Wienerfilteringisusedtoestimatereceiverfunctioninatime-domain.Withtheverticalcomponentof3-componentteleseismicPwaveformastheinputofaWienerfilter,receiverfunctionasthefilterresponse,andradialandtangentialcomponentsastheexpectedoutput,receiverfunctionisestimatedbyminimizingtheerrorbetweenexpectedandactualoutputs.ReceiverfunctioncanbeobtainedbysolvingtheToeplitzequationusingtheLevinsonalgorithm.Thenon-singularityoftheToeplitzequationensuresthestabilityofWienerDeconvolution.BothsyntheticandobservationalseismogramcheeksshowthatWienerDeconvolutionisaneffectivetime-domainmethodtoestimatereceiverfunctionfromteleseismicPwaveform.

简介：许多研究集中了于水平地面运动，当忽视从垂直地面motion.However产生的相关问题时，导致为水平地面运动的许多连贯功能，地震事件证明了地面的垂直部件打手势有时管理structures.In的最终的失败这份报纸，空间地面运动的一个垂直连贯功能模型基于Hao模型被建议并且疼痛模型的1个数组记录，和有效性被表明

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简介：Weaddnewmodulesforreceiverlunction(RF)analysisinSplitLabtoolbox,whichincludesthemanualRFanalysismodule,automaticRFanalysisandrelatedqualitycontrolmodules,andH-kstackingmodule.Theupdatedtoolbox(namedSplitRFLabtoolbox),especiallyitsautomaticRFanalysismodule,couldcalculatetheRFsquicklyandefficiently,whichisveryusefulinRFanalysiswithhugeamountofseismicdata.ChinaisnowconductingtheChinArrayprojectthatplanstodeploythousandsofportablestationsacrossChinesemainland.OurSplitRFLabtoolboxmayobtainreliableRFresultsquicklyatthefirsttime,whichprovideessentiallynewconstrainttothecrustalandmantlestructures.

简介：EstimatedGreen'sfunction(EGF)betweenstationshasbeenextractedfromambientseismicnoise,directsurfacewaveandcodawaves.Itisalsoconfirmedbylaboratoryexperimentsonultrasonicsandtheoreticalderivationsassumingdiffusivewavefield,equi-partitionofmodesorrandomsourcesonanenclosedsurface.Thismethodprovidesanewapproachtostudythecrustandmantlestructureatregionalscale,continentalscaleandglobalscale.Followingtheachievementswithseismometerrecords,therecordsofinfrasonicstation,hydrophoneandmicrophonewerealsousedtoobtaintheEGFsofdifferentwavefields.Sincesuperconductinggravimeterisabetterlongperiodinstrumentthanregularseismometer,EGFatlongerperiodisexpectedtobeobtainedwiththecrosscorrelationofgravitydata.Inthispaper,wewillshowtheEGFsextractedbycross-correlationsbetweenthesuperconductinggravimetersandtheseismometers.Boththetraveltimesanddispersioncurvesobtainedfromdifferentdatatypesareconsistent.Theresultshowsthatitispossibletoretrievethedeepstructurebythecrosscorrelationofgravitydata.

简介：Ithasbeenwellstudiedthattheγ-functionexplicitmethodcanbeeffectiveinprovidingfavorablenumericaldissipationforlinearelasticsystems.However,itsperformancefornonlinearsystemsisunclearduetoalackofanalyticalevaluationtechniques.Thus,anoveltechniqueisproposedhereintoevaluateitsefficiencyforapplicationtononlinearsystemsbyintroducingtwoparameterstodescribethestiffnesschange.Asaresult,thenumericalpropertiesanderrorpropagationcharacteristicsoftheγ-functionexplicitmethodforthepseudodynamictestingofanonlinearsystemareanalyticallyassessed.Itisfoundthattheupperstabilitylimitdecreasesasthestepdegreeofnonlinearityincreases;anditincreasesasthecurrentdegreeofnonlinearityincreases.Itisalsoshownthatthisintegrationmethodprovidesfavorablenumericaldissipationnotonlyforlinearelasticsystemsbutalsofornonlinearsystems.Furthermore,errorpropagationanalysisrevealsthatthenumericaldissipationcaneffectivelysuppressthesevereerrorpropagationofhighfrequencymodeswhilethelowfrequencyresponsesarealmostunaffectedforbothlinearelasticandnonlinearsystems.

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简介：Thisstudyproposesanewidentificationalgorithmabouttheadmittancefunction,whichcanestimatethefullsetofsixaerodynamicadmittancefunctionsconsideringcrosspowerspectraldensityfunctionsabouttheforcesandtheturbulencecomponents.ThemethodwasfirstnumericallyvalidatedthroughMonteCarlosimulations,andthenadoptedtoestimatetheaerodynamicadmittanceofastreamlinedbridgedeck.Theidentificationmethodwasfurthervalidatedthroughacomparisonbetweenthenumericalcalculationandwindtunneltestsonamovingbridgesection.

简介：Basedontheexistingcontinuousboreholestrainobservation,themultiquadricfunctionfittingmethodwasusedtodealwithtimeseriesdata.Theimpactofdifferencekernelfunctionparameterswasdiscussedtoobtainavaluablefittingresult,fromwhichthephysicalconnotationoftheoriginaldataanditspossibleapplicationswereanalyzed.Meanwhile,abriefcomparisonwasmadebetweentheresultsofmultiquadricfunctionfittingandpolynomialfitting.

简介：作者小心地与M_L=4.0～选择了地震5.0，215在台湾区域发生在外壳中。福建数字网络记录的最大的排水量的变细特征被多分析如下获得了：记载2.07+231.1/⊿(150km≤⊿≤650km)和刻度功能的相应表示是的=，R(⊿)=3.45-231.1(1/⊿-0.01)(150km≤⊿≤650km)然后，作者用为从September1997～2005年8月在台湾区域发生在外壳中的790地震在第1997a上述公式向前带的刻度函数从福建网络与数据决定了大小和它的错误。结果显示网络的平均误差与前者是0.20并且0.18与后者。平均误差与有车站修正的后者是0.13。与台湾地震学者决定的大小相比，有前者的大小价值平均在0.50是更低的，那平均在0.08与后者是更高的。

简介：Inthisarticle,weanalyzethecharactersofSV-componentreceiverfunctionofteleseismicbodywavesanditsadvantagesinmappingtheS-wavevelocitystructureofcrustindetail.Similartoradialreceiverfunction,SV-componentreceiverfunctioncanbeobtainedbydirectlydeconvolvingtheP-componentfromtheSV-componentofteleseismicrecordings.OuranalysesindicatethatthechangeofamplitudeofSV-componentreceiverfunctionagainstthechangeofepicentraldistanceislessthanthatofradialreceiverfunction.Moreover,thewaveformofSV-componentreceiverfunctionissimplerthantheradialreceiverfunctionandgivesprominencetothePSconvertedphasesthatarethemostsensitivetotheshearwavevelocitystructureintheinversion.ThesynthetictestsshowthattheconvergenceofSV-componentreceiverfunctioninversionisfasterthanthatoftheradialreceiverfunctioninversion.Asanexample,weinvestigatetheS-wavevelocitystructurebeneathHIAstationbyusingtheSV-componentreceiverfunctioninversionmethod.

简介：P-waveandS-wavereceiverfunctionanalyseshavebeenperformedalongaprofileconsistedof27broadbandseismicstationstoimagethecrustalanduppermantlediscontinuitiesacrossNortheastChina.TheresultsshowthattheaverageMohodepthvariesfromabout37kmbeneaththeDaxing’anlingorogenicbeltinthewesttoabout33kmbeneaththeSongliaoBasin,andtoabout35kmbeneaththeChangbaimountainregionintheeast.OurresultsrevealthattheMohoisgenerallyflatbeneaththeDaxing’anlingregionandaremarkableMohooffset(about4km)existsbeneaththebasin-mountainboundary,theDaxing’anling-TaihangGravityLine.BeneaththeTanlufaultszone,whichseperatestheSongliaoBasinandChangbairegion,theMohoisupliftandthecrustalthicknesschangesrapidly.WeinterpretthisfeatureasthattheTanlufaultsmightdeeplypenetrateintotheuppermantle,andfacilitatethemantleupwellingalongthefaultsduringtheCenozoicera.Theaveragedepthofthelithosphereasthenosphereboundary(LAB)is*80kmalongtheprofilewhichisthinnerthananaveragethicknessofacontinentallithosphere.TheLABshowsanarc-likeshapeinthebasin,withtheshallowestpartapproximatelybeneaththecenterofthebasin.TheupliftLABbeneaththebasinmightberelatedtotheextensivelithosphericstretchingintheMesozoic.Inthemantletransitionzone,astructurallycomplicated660kmdiscontinuitywithamaximum35kmdepressionbeneaththeChangbairegionisobserved.The35kmdepressionisroughlycoincidentwiththelocationofthestagnantwesternpacificslabontopofthe660kmdiscontinuityrevealedbytherecentPwavetomography.

简介：BasedonthesolutionsoftheGreen'sfunctionforasaturatedporousmediumobtainedbytheauthors,andusingtransformationofaxisymmetriccoordinates,Sommerfeldintegralsandsuperpositionoftheinfluencefieldonafreesurface,theauthorshaveobtaineddisplacementsolutionsofasaturatedporousmediumsubjectedtoatorsionalforceinahalf-space.Therelationshipcurvesofthedisplacementsolutionsandvariousparameters(permeability,frequency,etc.)underactionofaunitoftorquearealsogiveninthispaper.TheresultsareconsistentwithpreviousReissner'ssolutions,whereatwo-phasemediumdecaystoasingle-phasemedium.Thesolutionisusefulinsolvingrelevantdynamicproblemsofatwophasesaturatedmediuminengineering.

简介：一个纤维节模型基于Timoshenko横梁元素在这研究被建议基于考虑轴的框架元素的非线性的分析，曲折，并且砍变丑。这个模型用砍弯曲被完成相互依赖的明确的表达(SBIF)。元素的形状功能从平衡方程的同类的形式的准确答案被导出因为Timoshenko变丑hypothesis.The建议元素从砍锁是免费的。部分纤维模型与一个多轴的粘性材料模型一起被组成，它被用来模仿每纤维的联合砍轴的非线性的行为。由在纤维之中强加变丑相容性条件，部分、元素的抵抗力量是计算的。因为SBIF形状功能与为节的不同形状的砍修正者因素是交互的，一个反复的过程在建议Timoshenko元素的非线性的州的决心被介绍。另外，建议模型由采用一条corotational坐标转变途径处理几何非线性的问题。为非线性的几何分析的SBIFTimoshenko元素的corotational算法的推导过程被介绍。数字例子证实与一个纤维节模型一起的SBIFTimoshenko元素有象基于灵活性的明确的表达的一样的精确性和坚韧性。最后，SBIFTimoshenko元素被扩大并且demonstratedin一个三维的数字例子。

简介：ThisstudyproposesaGreen’sfunction,anessentialrepresentationofwater-saturatedgroundundermovingexcitation,tosimulategroundbornevibrationfromtrains.First,generalsolutionstothegoverningequationsofporoelasticmediumarederivedbymeansofintegraltransform.Secondly,thetransmissionandreflectionmatrixapproachisusedtoformulatetherelationshipbetweendisplacementandstressofthestratifiedground,whichresultsinthematrixoftheGreen’sfunction.ThentheGreen’sfunctioniscombinedintoatrain-track-groundmodel,andisverifiedbytypicalexamplesandafieldtest.Additionalsimulationsshowthatthecomputedgroundvibrationattenuatesfasterintheimmediatevicinityofthetrackthaninthesurroundingarea.Thewavelengthofwheel-railunevennesshasanotableeffectoncomputeddisplacementandporepressure.Thevariationofvibrationintensitywiththedepthofgroundissignificantlyinfluencedbythelayeringofthestratasoil.WhenthetrainspeedisequaltothevelocityoftheRayleighwave,theMachconeappearsinthesimulatedwavefield.TheproposedGreen’sfunctionisanappropriaterepresentationforalayeredgroundwithshallowgroundwatertable,andwillbehelpfultounderstandthedynamicresponsesofthegroundtocomplicatedmovingexcitation.

简介：Basedonthefittingonpaleoearthquakedataofintra-plateregionsinthenorthernpartofChi-naandgivingastatisticalmodeloftimeinterdependence,thepotentialdamageearthquakesinadefinitefutureperiodandcharacteristicsofpresentshocksalongtheLingwufaulthavebeenanalyzedbyusingdangerousprobabilityfunctionandsomenewdataconcerned.Wehavein-ferredthatthefaulthasenteredaperiodthatearthquakeswillprobablyoccur.ThereexistsapotentialdangerthatastrongearthquakewithMs7.0-7.5willoccurin10-100a.