简介：Inthegeoscientificcommunityoftheworld,avarietyofproposalsareknownashypothesestoex-plainthedynamicsofthecarth.Theseincludeplatcteetonics,theundationhyPothesis(vanBemmelen,1933),themodernexpanding-earthhypothesis(Carey,S.W.,1976),theupheavalocean-floorhypothesis(Hoshino,M.,1975),theoceanizationhypothe

简介：FourteenisolateddrownedreefshavebeenidentifiedaroundtheXishaUpliftbymultibeamandseismicdata.Thedrowningprocessesofthesereefscanbedividedintothreedifferentstages,whichcorrespondtothreedifferentacceleratedtectonicsubsidenceperiods.ThedrowningoftheXishareefsistheresultofthecombinedactionoftectonicsubsidenceandsealevelfluctuations,andthetectonicsubsidenceratehadtoremainabove0.2mmyr-1foralongtime.ThreeabruptacceleratedtectonicsubsidenceeventsthatoccurredinthelateMiocene,PlioceneandearlyQuaternaryintheXishaUpliftwerecloselyrelatedtothethermalsubsidenceprocessesafterthreestagesofpost-riftingmagmatism.ThemagmatismofthemiddleMioceneandthefollowingthermalsubsidenceresultedinthedrowningofreefsinthenorthwesternXishauplift(ZoneA).DuringtheearlyPliocene,massivemagmaticintrusionsandvolcaniceruptionsoccurredintheXishaUplift.Then,thesubsequentthermalsubsidencestartedthedrowningprocessofreefsinthenortheasternandwesternregionsoftheXishaUplift(ZoneBandC).DuringtheearlyQuaternary,large-scalemagmatismalsooccurredintheXishaUplift.Thesubsequentthermalsubsidenceresultedinanewrapidtectonicsubsidence,whichcausedthereefsinthesouthernandsoutheasternregionsoftheXishaUplifttodrown(ZoneDandE).

简介：Theauthorsstudythestructure,functionsanddataorganizationforthehazardanalysissystemofurbanpost-earthquakefireontheplatformofGIS.Ageneralhazardanalysismodelofthepost-earthquakefireispresented.TakingShanghaicentraldistrictasbackground,asystemforhazardanalysisofthepost-earthquakefireandauxili-arydecision-againstfireisdeveloped.

简介：Thedynamictorsionalbucklingandpost-bucklingofelasto-plasticcircularcylindricalshellisstudied.BytheusageoftheBodner-Partomconstitutiverelation,thepresentvisco-plasticproblemistreat-edasanorthotropicelasticproblem.Basedonthenonlinearlargedeflectionshelltherory,thegoverningdynamicbucklingequationissolvedbytheRunge-Kuttamethod,andthecriticalbucklingstressisdeter-minedbytheB-Rcriterion.Thepresentpaperismainlyfocusedontheimperfectionsensitivity,thestrainratesensitivity,andthedynamicpost-bucklingcharactersfortheshellloadeddynamicallywithaconstantshearstrainrate.Numericalresultsshowthatthecriticalshearstressandimperfectionsensitivitywillin-creasewiththeincreaseofstrainrate.Itisfoundthattheelasticbucklingstressismoresensitivetoimperfectionthanthevisco-plasticbuckling.Thepresentresearchalsorevealssomedynamicpost-bucklingcharactersforthecylindricalshell,anditisshownthattheshellwillvibra

简介：ReportedinthispaperaretheNdisotopiccompositionsofthepre-SinianandSinian-CambriansedimentaryrocksintheXiushuiarea,JiangxiProvince.SignificantdifferencesarenoticedbetweenthemintheirNdisotopicdompositions.Asforthepre-Sinianlightlymetmorphozedsedimentaryrocks,^143Nd/^144Nd=0.512000-0.512214,CNd(T)=-8.04-9.99,andTDM=18332426MaaresuggestedfortheSinian-Cambriansedimentaryrocks.ThesedifferenceswouldreflectthediversityofmaterialsourceforthesedimentaryrocksdepositedbeforeandaftertheSinianperiod.Mantlematerialap-pearstohavebeeninvolvedintheformationofthepre-Siniansedimentaryrockswhilethepost-Siniansedimentaryrocksarecomposedmainlyofrecycleddetritusfromthecontinentalcrust.

简介：与另外的迁居方法相比，反向时间的移植基于一个精确波浪方程，不是近似，并且在深度领域而非时间领域执行推测。它由强壮的表面下的结构复杂性和水平速度变化高度精确、不影响。差别方法基于三角形的格子维持差别方法的简洁和有限元素方法的精确。它能直接被使用没有静电干扰预处理，向前与复杂最高的表面和移植在模型上当模特儿。我们第一次为栈以后的反向时间的移植基于三角形的格子使用一个有限差别方法。模型数据上的测试证实二个方法的联合能在申请完成近完成式的结果。

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简介：Mafic-ultramafic建筑群在在中央JinlinProvince的Hongqiling是普遍的，NE中国。Hongqiling建筑群包括辉岩，橄榄石websterite，lherzolite，斑粝岩和leucogabbro。基于最近的geochronological结果，这些侵入产出大约216妈的锆石U-Pb年龄，暗示那他们在晚三叠纪的时期的emplaced并且mafic-ultramafic建筑群是在起源的post-orogenic。这些年龄与在区域的A类型花岗石的炮兵阵地是同时代的，但是比syn-orogenicgraniticmagmatism稍微年轻。父母岩浆的作文与高MgO在结晶的积累的橄榄石的使平衡期间是玄武岩的，并且它来自弄空或少年石版印刷球的披风，根据痕量元素和Sr-Nd同位素的结果。外壳的材料的数量污染了magmatic来源，暗示mafic-ultramafic岩石从导出外壳、导出披风的岩浆的混合产品发源。因此，magmatic来源被外壳的材料的数量污染，并且随后的水晶分别导致了Cu-Nimineralization。动态分析显示在北方中国古地台andJiamusi山岳的碰撞以后，石版印刷球的分层在期间造山运动以后导致了起来岩流圈并且团并且在导出披风的岩浆的plating下面侵入的welling，它由于导出披风的岩浆并且下地壳的部分融化导致了主要mafic-ultramafic岩浆的形成。这结果建议mafic-ultramafic建筑群属于在post-orogenic期间演变，并且他们作为在post-orogenic扩展环境存在的mafic-ultramafic塘群被暴露那处理的一间典型地重要的magmatic套房。Italso暗示orogenic过程在这个地区性的地质的背景最终完成了。在Xing的mafic-ultramafic建筑群的Thewidespread出现“一--在NEChina并且在在北Xinjiang的Altay-Tianshan-JunggarOrogenic的蒙古Orogenic显示maficintrusions是在post-orogenic过程期间演变的一间重要magmatic套房。这mafic岩浆的部分能在plated下面有下地壳，并且当热为associatedlate阶段采购花岗石的岩浆�

简介：在一些液化的沙存款的加速记录展出特殊尖刻的波形，由强壮的扩大和高周波的部件描绘了。一个全面组成的模型被用来分析如此的尖刻的加速回答的机制。一个理想化的single-degree-of-freedom(SDF)系统被构造，在哪个春天的力量排水量关系在砍的undrained期间跟随浸透的沙的压力紧张行为。SDF系统证明尖铁是直接与沙的变硬紧张的行为有关在液化以后的周期的砍期间。而且，在那里存在阀值砍拉紧长度，它根据有限振幅像液体砍产生在的紧张即时在液化以后的阶段期间州的零个有效压力。当时，尖刻的加速能仅仅发生周期砍紧张超过阀值砍紧张长度。因为，在加速尖铁之间的时间间隔与摇晃的继续一起逐渐地增加，这也被揭示因为阀值砍紧张长度增加逐渐地然后更，时间被需要产生更大砍引起紧张变硬的紧张。在Kushiro港口地点和港口岛地点的记录通过充分联合的方法在过去的地震期间被模仿验证介绍机制。

简介：Basedontheelasticdislocationtheory,multilayeredcrustalmodel,andrupturemodelobtainedbyseismicwaveforminversion,wecalculatedthecoandpost-seismicsurfacedeformationandgravitychangescausedbytheYushuMW6.9earthquakeoccurredonApril14,2010.TheobservedGPSvelocityfieldandgravityfieldinYushuareasaredisturbedbythecoandpost-seismiceffectsinducedbyYushuearthquake,thusthetheoreticalcoandpost-seismicdeformationandgravitychangeswillprovideimportantmodificationforthebackgroundtectonicmovementofYushuandsurroundingregions.ThetimerelaxationresultsshowthattheinfluencesofYushuearthquakeonYushuandsurroundingareaswilllastaslongas30to50years.Themaximumhorizontaldisplacement,verticalupliftandsettlementareabout1.96,0.27and0.16m,respectively,themaximalpositiveandnegativevalueofgravitychangesare8.892×10-7m·s-2and-4.861×10-7m·s-2,respectively.Significantspatialvariationscanbefoundonthecoandpost-seismiceffects:Theco-seismiceffectmainlyconcentratesintheregionneartherupturefault,whileviscoelasticrelaxationmostlyactsonthefarfield.Therefore,whenusingthegeodeticdatatoresearchtectonicmotion,weshouldnotonlyconsidertheeffectofco-seismiccausedbyearthquake,butalsopayattentiontotheeffectofviscoelasticrelaxation.

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简介：ThisstudyreportszirconU-PbandHfisotopesandwhole-rockelementaldataforgranodioritesfromtheEastKunlunorogen.ThezirconU-Pbdatingdefinestheircrystallizationageof235Ma.Therocksarecharacterizedbyhigh-Kcalc-alkaline,magnesianandmetaluminouswith（K2O+Na2O）=6.38wt.%–7.01wt.%,Mg#=42–50[Mg#=100×molarMg/（Mg+FeOT）],A/CNK=0.92–0.98,coupledwithhighεHf（t）valuesfrom-0.65to-1.80.Therockswerederivedfrompartialmeltingofajuvenilemaficcrustalsourcewithinnormalcrustthickness.Thejuvenilelowercrustwasgeneratedbymixinglithosphericmantle-derivedmelt（55%–60%）andsupracrustalmelt（40%–45%）duringtheseafloorsubduction.TogetherwithavailabledatafromtheEastKunlun,itisproposedthatthestudiedMiddleTriassicgranodioriteswereformedinpost-collisionalextensionsetting,inwhichmeltingofthejuvenilelowercrustinresponsetothebasalticmagmaunderplatingresultedintheproductionofhigh-Kgranodioriticmelts.