简介:1.SURVEYOFGLOBESEISMICITYIN2004Atotalof19strongearthquakeswithMs≥7.0occurredintheworldaccordingtotheChineseSeismicStationNetworkin2004(Table1).ThestrongestearthquakewastheSumatraearthquakewithMs8.7nearthenorthwestcoastofSumatraonDecember26(Fig.1).Globalseismicitymaintainsthesamepatternsfromrecentyears,beingdistributedmainlyonthewesternpartofthecircum-Pacificseismiczone.RemarkablemacroseismicactivitieswereseenintheIndia-AustralianplateandintheJapanregion.ThemacroseismicactivitiesofMs≥7.0in2004wereasfollows:
简介:为探讨阿尔金山前东坪基岩花岗岩的岩石成因类型和构造演化背景,对东坪花岗岩进行了岩石学和元素地球化学研究。结果表明,东坪花岗岩体富硅(SiO2均值为71.4%)、富铝(Al2O3均值为13.57%),其碱度率A.R.值为2.23~3.19,铝饱和指数A/CNK大于1.44,属于过铝质的高钾钙碱性花岗岩;其富集大离子亲石元素、亏损高场强元素,稀土配分模式属于中等右倾型,铕负异常(δEu为0.44~0.61),轻稀土富集。其岩石成因类型为S型花岗岩,源自地壳杂砂岩重熔,没有地幔物质参与或参与较少。东坪花岗质岩浆侵入活动发育在加里东晚期的岛弧环境,指示南阿尔金山前地区存在大陆边缘的沟-弧-盆体系,其原岩形成于塔里木向柴达木地块的俯冲及碰撞演化背景。
简介:ProfessorAliBasiraHenriKampunzupassedawayonMonday,29November2004attheMidlandParkHospitalinJohannesburg(SouthAfrica)andwaslaiddowntoeternalpeaceonMonday,06December2004inhishomecountryinKinshasa(DemocraticRepublicofCongo,DRC).Hewasawell-knownandgreatlyacknowledgedtrilingualAfricangeoscientist.Somearguethathewasthebest-knownandthegreatestAfricangeologistofourtime.
简介:CentralAsiaencompassesnearlyadozencountriesandconsistsofseveralorogeniccomplexes,oneofwhich,theAltaids,isca.1000kmwideand7000kmlong,stretchingfromtheUralMountainsintheWesttothePacificOceanintheEast.ItiscomposedofseveraltectoniccollagesthatwerecreatedbyoceanicsubductionandcontinentalcollisionfromtheLateProterozoictotheendofthePalaeozoic.Thelastdecadewitnessedtheestablishmentoftwocompetingtectonichypothesesforthedevelopmentoftheseorogeniccomplexes.Thefirstviews
简介:用NCEP/NCAR分析,冬台风的结构把Nanmadol称为落在台湾2004年12月4日上那在这份报纸被检验了,Nanmadol在结构和时间进化看起来类似到夏天台风,这被发现;它的中央部分温暖、潮湿,并且当在上面的对流层有分叉时,集中在更低的对流层被观察。冬和夏日台风之间的差别被发现。在在上面的对流层的更低的对流层和气旋的骚乱的西南溪流流动比在夏日台风在Nanmadol似乎显著地更弱。文件结束分析为在台风循环的时间的变化的大约90%全部的变化能被EOF1和EOF2的二个领先的文件结束模式解释的Nanmadol表演的海水平压力(SLP)表现了。当EOF2在影响Nanmadol的动人的方向的环境SLP分布显示出变化时,EOF1显示出Nanmadol的结构和紧张变化。