简介:AnellipticalwindfieldmodeloftyphoonsisputforwardbasedonthecharacteristicsofthetyphoonwindfieldsoccurringintheYellowSeaandBohaiSea.Bycontrastingitwiththecirculartyphoonwindfieldmodel,itisfoundthattheellipticalmodelcanadequatelyrepresenttherealwindfieldandtracetheprocessofatyphoonstormsurge.Thenumericallysimulatedresultsofstormsurgesbyusingtheellipticalmodelareingoodagreementwiththeobservationsandmarkedlybetterthanthosebyusingthecircularmodel.
简介:TheassociationbetweenthelunarphasesandtheatmosphericelectricfieldhasbeeninvestigatedfromthesuperposedepochanalysisofthelongseriesofcontinuousdataoftheverticalelectricfieldforColaba,Bombay(18°53’N,73°48’E11mASL)fortheperiod1947-1966.Alsotheperiodicitiesintheatmosphericelectricfieldhavebeenstudiedfromthespectralanalysisofthedata.Thestudyhasindicatedthatwhenthefullmooniswithin4oftheeclipticplanei.e.,Bf4°,theelectricfieldpeaksonthedayofthefullmoonfollowedbyasteepfallinthefieldvaluesupto4daysfollowingthefullmoondayandthereafteritshowedasteepincrease.Also,theelectricfieldhasexhibited5-9dayperiodicityanditsmultiplesarenearlyalwayspresent.Theperiodicityintheelectricfieldcorrespondswiththeaveragetimeintervalbetweenthesuccessivemagneticsectorboundary(MSB)crossingsi.e.,7days.Onmostoftheoccasions,theMSBcrossingdayisassociatedwithamaximumof
简介:TheDachangtin-polymetallicorefieldinnorthernGuangxi,China,liesinamid-latePaleozoicriftthatbordersupthesouthernboundaryoftheJiangnan-XuefengMassif.Asagiantoredeposit,itdepositedinmiddleoftheNandang-Hechimetallogeniczone.TheorehostingstrataareoftheDevonion,whichshowstheevidentcharacteristicsofpolymetallicelements,i.e:,Sn,Zn,Pb,Sb,As,Cu,Ag,In,Ge,Cd,etal.,andover1000000ttinreserves.
简介:作为要学习的区域拿欧洲的主要陆地,新卫星重力技术的潜力:追踪的satellite-to-satellite(SST)并且与SST模型一起改进地区性的重力场模型的精确性被调查。这些模型的缺点被讨论。与是的GPM98C参考,几个另外的模型,的严肃异例剩余最近的SST全球重力场模型(EIGEN系列和GGM系列),被计算并且比较。在选择区域,有期刊性质的一些系统的错误在EIGEN和GGM存在的比较表演的结果是在高度和顺序的S系列模型。没在经典严肃模型被显示出的一些信息在EIGEN和GGM的S系列模型的低、中间的度和顺序被检测。最后,SST模型的有效的最大的度和订单被建议。
简介:Platemotionisoneofthemajordynamicsourcesfordeformationinthecrustandthemantle.SincethedeformationinthecrustcanbeobservedbyGPSandgeologicalobservation,thecomparisonbetweenthedeformationofthecrustandthatofthemantlebecomesoneofthemajormethodsavailableforstudyingthecouplingbetweencrustmovementandmantledeformation.RegionalcrustalstrainratetensorvaluesinChina,inferredfromQuaternaryfaultslipratesandearthquakedeformationdatawithinareasofapproximately200×200km,areinterpolatedwithsmooth,continuousfunctions(spline)todetermineaself-consistentmodelvelocitygradienttensorfieldforthepresent-dayChinesecontinent.Intheinterpolationprocess,GPSvelocityvectorsarealsomatched,withinadefinedframeofreference,bythemodelvelocityfield.Thedirectionsofsheardeformationcalculatedfromthemodelvelocityfieldarecomparedwiththefastdirectionsofshear-wavesplittinginferredfromSKSphasesandPnwaves.Theresultsmightrepresentthesheardeformationinmantleandthedeepcrust,respectively.Thereisarelativelylargedifferencebetweentheaveragedirectionofcrustalshearandthatofmantleshearintheareaofactivetectonics,whichmayindicatethatintheseactiveareasthecrustandthemantlemaybedecoupled.
简介:IntroductionSinceearthquakeoccurrence,theyhaveprovidedgoodopportunitiesfordiscoveringtheundergrounmysteryandrecognizingearthquakes—thenaturephenomenon.Alargeearthquake’soccurrence,ofcourse,willbringhumankindwithlargedisaster.Withrecognizantenhance,wecanestablishmoreeffectivemeasureforalleviatingseis
简介:在这份报纸,用在云南和它的邻近的区域的中等强壮的地震的焦点的机制解决方案,并且基于焦点的机制解决方案的参数的统计分析,我们详细在云南区域讨论了地震差错类型和现代构造压力领域的特征。结果证明很中等强壮的地震发生在云南区域具有罢工--滑动类型,等于80%总数。指责的正常和有有罢工滑倒地震的罢工滑倒和颠倒和颠倒的正常在比例是几乎相等的,大约8%各个。云南区域的构造压力领域是在水平附近的,并且地震差错飞机的剧降大。有三主要动态来源,对一个人是的云南区域起作用从Myanmar,老挝和越南的NE,NNE和指导NNW的代理力量;第二是SE-SSE从四川和四川云南菱形块的指导力量并且第三是NW-NNW从华南块的指导力量。这三代理力量控制了主要差错的指责的行为和云南和它的邻近的区域的强烈地震活动的特征。
简介:Aseriesofadvancedinstrumentswereappliedtoobtainthefielddataofbed,bedformsandrelevantdynamicfactorsinthe150km-longreachoftheChangjiangRiverfromJiangyintoHengshaIslandinMarch2002.Wefoundthatwell-sortedfinesandwasinthemajorityofthebedsediment,whichhadamediandiameterof2φ.Well-developedsandwaveswereformedbecausethegrainsjumpedtogetheronthebed,whichwasrelatedtothegranularityandcurrentvelocityduringtheflood-ebbtidalcycles.
简介:为测试作为这个区域拿中国,新卫星严肃技术的潜力,为改进地区性的重力场模型的精确性追踪的satellite-to-satellite被学习。与是的WDM94引用,三个模型,的严肃异例剩余最近二个优雅全球重力场模型(EIGEN_GRACE02S,GGM02S)并且EGM96,被计算并且比较。为在三个模型的剩余之中的差别的原因被讨论。在剩余之间的Thecomparison证明在选择区域,EIGEN_GRACE02S或GGM02S比在更低的度部分(不到110度)的EGM96好。通过模型严肃异例剩余的分析,另外,有期刊性质的一些系统的错误在EIGEN和GGM模型,的更高的度部分存在,这被发现结果能也在SST严肃数据的确认作为引用被拿。
简介:Spatialandtemporalvariationof gravity fieldinthecapitalregionChang-CaiHUA;(华昌才)YongGUO;(果勇)Duan-FaLIU;(刘瑞法)GangXIAO;(肖钢),J.T....