简介:Catalogueofearthquakes(March-May,1995)Pei-ShanCHEN(陈培善)(InstituteofGeophysics,StateSeismologicalBureau,Beijing100081,China)Il...
简介:AnearthquakewithMS5.8occurredon10March2011inYingjiangcounty,westernYunnan,China.Thisearthquakecaused25deathsandover250injuries.Inordertobetterunderstandtheseismotectonicsintheregion,wecollectedthearrivaltimedatafromtheYunnanseismicobservationalbulletinsduring1Januaryto25March2011,andpreciselyhand-pickedthearrivaltimesfromhigh-qualityseismogramsthatwererecordedbythetemporaryseismicstationsdeployedbyourInstituteofCrustalDynamics,ChinaEarthquakeAdministration.Usingthesearrivaltimes,werelocatedalltheearthquakesincludingtheYingjiangmainshockanditsaftershocksusingthedouble-differencerelocationalgorithm.OurresultsshowthattherelocatedearthquakesdominantlyoccurredalongtheENEdirectionandformedanupside-downbow-shapedstructureindepth.ItisalsoobservedthataftertheYingjiangmainshock,someaftershocksextendedtowardtheSSEoverabout10km.TheseresultsmayindicatethattheYingjiangmainshockrupturedaconjugatefaultsystemconsistingoftheENEtrendingDaYingjiangfaultandaSSEtrendingblindfault.Suchstructuralfeaturescouldcontributetoseverelyseismichazardsduringthemoderate-sizeYingjiangearthquake.
简介:ThegeomagneticeffectsofthetotalsolareclipseinMoheareaandthepartialeclipseoccurredonMarch9,1997inChinaareanalyzedinthispaper.ThegeomagneticeffectsoftheeclipsewidelydistributedinChinaareobtained,whichshowHcomponentdecreasesobviouslyandissymmetricalongthelatitudewithacenternear33(Nduringtheeclipsetime.TheseresultsofsolareclipsegeomagneticeffectsarethenewestinrecentyearsobtainedinthelargestareainChina.
简介:ThesynopticsituationandmesoscalestructureofanexplosiveextratropicalcycloneovertheNorthwesternPacificinMarch2007areinvestigatedthroughweatherstationobservationsanddatareanalysis.Thecycloneislocatedbeneaththepolewardsideoftheexitofa200hPajet,whichisastrongdivergentregionaloft.Atmid-level,thecycloneliesonthedownstreamsideofawell-developedtrough,whereastrongascendingmotionfrequentlyoccurs.Cross-sectionanalyseswithweatherstationdatashowthatthecyclonehasawarmandmoistcore.A'nose'ofthecoldfront,whichischaracterizedbyalow-levelprotrudingstructureintheequivalentpotentialtemperaturefield,formswhenthecyclonemovesoffshore.This'nose'structureishypothesizedtohavebeencausedbytheheatingeffectoftheKuroshioCurrent.Twolow-leveljetstreamsarealsoidentifiedonthewesternandeasternsidesofthecoldfront.Thewesternjetconveyscoldanddryairat800-900hPa.Thewindinthenorthernpartisnortheasterly,andthewindinthesouthernpartisnorthwesterly.Bycontrast,theeasternjetcarrieswarmandmoistairintothecyclonesystem,ascendingnorthwardfrom900hPato600-700hPa.Thesouthernpartisdominatedbythesoutherlywind,andthewindinthenorthernpartissouthwesterly.Theeasternandwesternjetssignificantlyincreasetheairtemperatureandmoisturecontrastinthevicinityofthecoldfront.Thisincreasecouldplayanimportantroleinimprovingtherapidcyclogenesisprocess.
简介:ThedistributionalfeaturesoftemperatureandsalinityinthenorthernTaiwanStraitshavebeenanalyzedbasedontheCTDdataduringFebruary-March,1998.Thecharacteristicsoftemperatureandsalinityaresummarizedasfollows:(1)thereexistsacoastalwateralongthewesterncoastoftheTaiwanStraits,withlowtemperatureandlowsalinityattheupperlayer;(2)ahightemperatureandhighsalinitywatertongueextendsnortheastwardalongtheeasterncoastoftheTaiwanStrait.
简介:在这篇论文,在2005年3月9日发生在黄海上的一个波涛汹涌的海雾事件被调查。与在它的成熟阶段的几百公里的空间规模,海雾补丁在一些地点沿着山东半岛海岸把可见性归结为100m或少得多。在岛和海岸的卫星图象,表面观察和soundings,和从日本气象学机构(JMA)的分析被用来描述并且分析这个事件。分析显示这海雾能作为使雾凉下来的移流被分类。包括雾区域和它的运动的这海雾的主要特征被大气的研究Mesoscale模型(MM5)的第五产生的宾夕法尼亚州的大学/公民中心相当复制。模型结果建议这个事件的形成和进化能是被构画出:(1)低级空气的南方的温暖/潮湿的移流与大约600m的厚度导致了强壮的sea-surface-based倒置;(2)当倒置从更温暖的东方海搬到更冷的黄海时,当海雾响应由混合的骚乱冷却并且弄湿成长了时,热内部边界层(TIBL)逐渐地在倒置的底形成了;(3)当TIBL向北方移动了,(4)强壮的在北方的寒冷和干旱风破坏了TIBL并且驱散海雾,海雾发展了。这研究的主要调查结果是海雾响应相对坚持的南方的温暖/潮湿的风和冷海面形成,并且由风切变混合的那骚乱是为使海洋的层凉下来并且弄湿的主要机制。另外,敏感实验的学习显示确定的数字建模提供一答应在黄海而是它上的海雾的预言的途径可能是更有效的认为整体数字因为极端敏感,当模特儿为输入建模。
简介:1SURVEYOFGLOBALSEISMICITYIN2013Atotalof23strongearthquakeswithMS≥7.0occurredin2013throughouttheworldaccordingtotheChinaSeismicNetwork(Table1).ThestrongestearthquakewasintheSeaofOkhotsk,measuringMS8.2onMay24(Fig.1).Earthquakesoccurredmainlyinthewesternpartofthecircum-Pacificseismicbelt.Comparedwiththeseismicityin2012,thefrequencyincreasedsignificantlyandtheenergyreleaseofearthquakeswasobviouslylow.FeaturesofglobalseismicityofMS≥7.0areasfollows:
简介:在13:46在2011年3月11日(北京时间),Mw=9.0的地震发生在日本。由从Guanhekou比较海啸数据,有另外的海啸波浪观察的海洋的车站从东南收集了中国的沿海的区域,仅仅在Guanhekou,最大的波浪高度的位置出现在中间的部分而非在海啸波浪火车的前面,是明显的。海啸繁殖的一个数字模型基于2-D,非线性的浅水方程被造学习影响范围和在江苏发现的特殊海啸波形的主要原因沿海的区域。结果将近显示出那江苏沿海的区域的three-quarters,主要光线的沙山脉向北包括了部分,在波浪火车的中间的部分到达了它的最大的海啸波浪高度。特殊波形的主要原因是专辑在水下地形学黄海和华东海区域调节,它显著地影响了海啸繁殖和波形。尽管陆地边界思考在最大值的位置上带了效果,挥动高度到某个程度,作为在观察点和岸之间的事件波形和距离的限制,它不是特殊波形的主导的影响因素。海啸波浪上的Coriolis力量影响是那么弱的它不是为在江苏沿海的区域的特殊现象的主要原因。学习提醒我们最破坏的波浪可能不在海啸波浪火车出现在第一个。
简介:ThispapersummarizesthelayoutoftheYunnanseismicELFelectromagneticobservationnetwork,siteselection,ELFelectromagneticinstrumentsystem,dataprocessingandotherconstruction.TheprincipleandmethodofusingtheELFelectromagneticwavetechniquetomonitorandpredictearthquakesareexpounded.ThelongtermmonitoringofELFelectromagneticfieldsiscarriedoutintheYunnanearthquakepronearea,andatthesametime,thechangesinelectricalparametersandspatialelectromagneticfieldsoftheregionalcrustalmediumstructurearemonitored.Thefunctionssuchasautomatic,quasirealtime,remotemonitoring,networkmonitoring,dataprocessingspecialization,dataservice,datasharingandindustrializationoftheELFelectromagneticobservationdatahavebeenrealized.Inordertocapturethedeepelectromagneticprecursoryinformationoftheearthquakes,serviceforearthquakepredictionresearch,whichhasbroadapplicationprospectsanddevelopmentpotential.ThroughtheresearchoftheseismicityofYunnaninthetrialrunperiodoftheproject,thepreliminaryresultsoftheextremelowfrequencyelectromagneticobservationoftheYunnanearthquakeinrecentyearsaregiven.TheelectromagneticprecursorsandtheelectromagneticeffectsoftheYangbiearthquakearerecorded.Inthe3-monthperiodbeforetheearthquake,thepowerspectrumoftheelectricandmagneticfields,theapparentresistivityandtheimpedancephaseintheobservedsignalsareallabnormal,andgraduallyincreasedwithtime.Themaximumvalueisreached20daysbeforetheearthquake,andanearthquakeoccurswhenthechangeisrestoredtonormal.
简介:利用1960~2013年安徽21个气象台站逐日降水观测资料及NCEP/NCAR再分析资料,对极端降水指数时空分布规律及区域性极端日降水环流异常特征进行分析,结果表明:(1)时间尺度上,安徽近54a持续干燥指数(CDD)呈微弱下降趋势,其余指数呈上升趋势,其中淮北持续干燥指数(CDD)下降显著,江南极端降水量(R95p)、5d最大降水量(RX5day)、日降水强度(SDII)上升显著,而江淮之间各指数变化趋势较弱;(2)空间尺度上,极端降水量(R95p)由北向南逐渐增大,5d最大降水量(RX5day)除蒙城和滁州外分布情况与R95p相似,持续干燥指数(CDD)则相反,平均日降水强度(SDII)在安徽北部和西南部较大,中部较小;(3)安徽极端降水量主要空间分布类型为整体一致型、南北差异型和淮北、淮南与江淮差异型;(4)安徽省极端日降水量95%和99%分位阈值分别为25.52mm/d和39.06mm/d,年际变化呈微弱的上升趋势,5~8月是极端日降水的多发期,尤其是6月下旬至7月中旬;(5)春季,安徽极端日降水事件的发生受乌拉尔山和鄂霍次克海阻塞高压活动影响;夏季,副高较强,低层安徽处于上升运动区,南海、孟加拉湾水汽由西南气流输送至安徽上空,同时,在北方冷空气南下的配合下,形成极端日降水。
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简介:对放射的过程的云microphysical和降雨回答通过台风Fitow(2013)的解决云的模型敏感实验的分析被检验在期间乍见陆地。预算分析证明水云的放射的效果的排除引起的吝啬的降雨的增加面对冰云的放射的效果由云冰在雨点的生长对应于减少,但是降雨对当冰云的放射的效果不在时的水云的放射的效果感觉迟钝。源于冰云的放射的效果的移动的吝啬的降雨的增加对应于提高的网冷凝作用。冰云的放射的效果的水云的放射的效果的排除当面引起的最大的降雨(缺席)的增加(减少),或冰云的放射的效果的移动(缺席)当面水的放射的效果遮蔽,在网condensation.The平均数雨中主要对应于改进(减小)率是雨紧张和部分降雨范围的一个产品。处于吝啬的雨率的导致放射的差别与在雨紧张的差别有关。处于最大的雨率的导致放射的差别在最大的降雨的部分范围与差别被联系。