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1.
根据有限的重力资料,首先对珠穆朗玛峰附近的重力场特征作了分析,结果表明,空间异常（Δｇｆ）均为正值且变化剧烈,它主要受地形起伏制约;布格异常（Δｇｂ）均为负值,但比其北侧高原大,说明喜马拉雅山虽然最高,但“山根”并非最深;均衡异常（Δｇｉ）均为正值,且比南北两侧为大,揭示了喜马拉雅山脊的下方可能存在密度较大的物质。其次,根据Δｇｆ与高程相关性极强（关联度达０．９６～０．９７）的特点与４种有关的公式,有效地推估了珠峰顶上的重力值,该值为９７６９８０×１０－５ｍ·ｓ－２,其平均误差为±６×１０－５ｍ·ｓ－２。这一结果可为精确确定珠峰的大地水准面和正高提供必要的数据。 相似文献
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中国东南陆缘大地水准面的确定 总被引：1，自引：0，他引：1
利用我国东南地区１１８２２个重力数据、３０″×３０″数值地形模型和ＷＤＭ９４重力位模型,以Ｓｔｏｋｅｓ理论为基础,采用低通滤波方法处理远区影响,计算了中国东南陆缘２．５′×２．５′格网重力大地水准面,其结果与福建、山东的ＧＰＳ水准相比较,精度分别为±０．１２４ｍ和±０．０６２ｍ。 相似文献
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本文使用Ｎａｋａｉ预处理和Ｖｅｎｅｄｉｋｏｖ调和分析方法，对滇西地区下关台ＧＳ１５－２２７重力仪１９８７－１９９２年观测资料和丽江台ＥＴ－２２重力仪１９９１－１９９２年的观测资料进行了分析处理，并对其计算结果进行了仪器动力学特征及惯性和海潮负荷改正，进而确定滇西地区潮汐基准参数为：δ（０１）＝１．１６６±０．００１，δ（Ｍ２）＝１．１６３±０．０００，（０１）＝－０．３８±０．０８，（Ｍ２）＝－０．３２±０．０８ 相似文献
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武汉基准台重力合成潮信号确定 总被引：1，自引：1，他引：0
合成潮是一种半理论和半实测的潮汐信号。综合采用武汉国际重力潮汐基准值、非弹性地球潮汐理论模型、地球近周日摆动对周日重力潮汐观测的共振影响以及全球和局部海洋潮汐的负荷效应，精密确定了武汉基准台的重力合成潮信号，与同一段时间内超导重力仪的实测潮汐信号的均方差为０ ．２２５ ×１０ － ８ ｍ／ｓ２ 。 相似文献
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家峪－北五台沟一带太古宙变质岩经过韧性剪切作用。变质岩中石英的应变特征揭示了该韧性剪切带各种因素的量，经分析计算差异应力为σ＿１－σ＿３＝１２２．８７ＭＰａ，最大剪切应力为τ＿（ｍａｘ）＝６１．４４ＭＰａ，剪切带的温度为５５Ｏ－６５０℃，剪切带形成深度为１８－２２ｋｍ，静压力即围压为４５０－６００ＭＰａ，弗林指数Ｋ＝０．４９－０．５０．经历三维应变，Ｘ轴增加６０％，Ｙ轴增加２５％，Ｚ轴缩短５０％，体积缩小３％，变形强度为Ｒ＝２．８３，应变速率为ε＝（４×１０￣（－９）－４×１０￣（－１０））／ｓ，变形比温度值为Ｔ／Ｔｍ＝０．９６－１．１３，等效粘滞度为（３．０７×１０￣（１０）－３．０７×１０￣（１１））ＭＰａ／ｓ。石英的应力结构发育。 相似文献
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基于我国武汉超导重力仪１９８５年１１月２３日至１９９４年１２月３１日（３３２６ｄ共７９８２４ｈ整点读数值）的长周期序列重力潮汐观测数据，利用国际上通用的资料分析方法和计算机软件系统研究了重力场潮汐变化特征，精密测定了地球潮汐常数，几个主要潮波的振幅因子测定精度达０．０４％。对采用不同引潮位展开、是否考虑加权滤波、做气压改正、删除错误数据以及规定数据段均方差上限等方式对提高资料分析精度的影响问题进行了讨论。利用Ｓｃｈｗｉｄｅｒｓｋｉ全球模型对重力潮汐观测分析结果进行了海潮负荷改正，较系统地研究了观测重力残差和台站气压变化之间的相关性，在时间和频率域内测定了相应的大气重力导纳值。与Ｗａｈｒ－Ｄｅｈａｎｔ标准地球潮汐模型相比较，潮汐振幅因子的平均偏差分别是０．４％（Ｏ１波）和０．２％（Ｍ２波）。 相似文献
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采用求解地壳单层密度变化的一般公式，导出其平面近似公式并给出了相应的数值计算方法。在此基础上，将点位错引起的地表形变和重力变化同时解析延拓至Ｂｊｅｒｈａｍｍａｒ球面上，得到了点位错引起的地壳单层密度变化的图像。分析表明：①单层密度变化图像与地表形变、重力变化图像相似；②地表形变对单层密度变化的影响比地表重力变化要大；③若点位错引起地表重力变化为１０－６～１０－７ｍ／ｓ２量级、高程变化为０．１～１ｍ量级，则单层密度变化可达１０３～１０４ｋｇ／ｍ２量级；④单层密度变化在隆升区为正，沉降区为负 相似文献
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长江三峡及邻区构造应力场和震源错动类型的研究 总被引：2，自引：2，他引：0
在文献［３］提出的用计算机确定震源断层面解的基础上，进一步给出了解的置信度。置信度由两个因子组成（Ｃ_１，Ｃ_２）。其中Ｃ_１为初动符号的符合比，Ｃ_２为解的不可变动空间与全部空间的比。使用长江三峡及邻区（北纬２８°－３４°，东经１０８°－１１４°）１９７４年以来的初动观测资料，确定了Ｍｓ≥２．１的４０次地震的断层面解、该区的区域应力场和分区应力场及平均错动性质。此外还给出了黄陵背斜地区的应力场特征。结果表明，黄陵背斜的地震构造活动具有整体性，构造过程发生在１５～２０ｋｍ的深度，张应力轴的方向分布显示以背斜为中心的幅射状态。 相似文献
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１ 前言１９９８年１月１０日张北－尚义Ｍｓ６．２级地震（λＥ１１４．３°,φＮ４１．１°）,是继１９８９年大同－阳高Ｍｓ６．１地震后,发生在华北北部地区的又一次６级以上强震。距离震中区１１０ｋｍ的内蒙古自治区宝昌地震台的ＳＱ－７０水平摆倾斜仪和地电阻率在震前均观测到明显的前兆异常。尽管在此次张北－尚义地震前,根据某些测项的异常变化,作出了一定的预报,但从整体来讲,并未作出准确的短临预报。因此,对宝昌地震台（λＥ１１４°１５′,φＮ４１°５６′）的主要前兆测项,即ＳＱ－７０地倾斜和地电阻率在张北地… 相似文献
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从北部海沿海采捕的日本鬼Ｙｏｕ（Ｉｎｉｍｉｃｕｓ ｊａｐｏｎｉｃｕｓ）亲鱼，经暂养后进行催产，雌鱼每千克体重注射ＬＲＨ－Ａ３１０－μｇ＋ＤＯＭ５ｍｇ或ＨＣＧ６００～８００ＩＵ＋ＬＲＨ－Ａ３３０～４０μｇ；雄鱼注射同样药物，剂量减半。共采卵１０９万粒，平均受精率８９．０％，平均孵化率为９０．０％，共培育出体长１．８～２．８ｃｍ的幼鱼２６．８万尾，平均成活率３０．７％。 相似文献
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Based on the hydrographic data in austral summer during the 22nd Antarctic Expedition of China(2005/2006),some features can be found about the northern margin of Emery ice shelf as follows.The heat content in the surface layer(0-50 m) at the eastern end and the western end of the ice-shelf margin is much higher than that at the middle.The upper mixing-layer depth and the seasonal thermocline depth at the middle of the ice-shelf northern margin are much shallower than those at the both ends.However there is much less difference between the middle and the ends in the bottom layer.The remote sensing photos show that the inhomogeneity in the surface-layer water is closely related to the spatial distribution of the floes and polynia in the area. 相似文献
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Phylogenetic analysis based on 16S rDNA of 8 strains of cultivable bacteria isolated from Arctic sea-ice was studied.The results showed that strain BJ1 belonged to genus Planococcus,which was a genus of low mole percent G C gram-positive bacteria;strain BJ6 belonged to genus Burkholderia of β-proteobacteria and the rest 6 strain all belonged to γ-proteobacteria,of which strain BJ8 was a species of Pseudoalteromonas,strain BJ2-BJ5 and BJ7 were members of genus Psychrobacter.Phylogenetic analysis also indicated that bacteria of genus Psychrobacter of the isolates formed a relatively independent phylogenetic cluster in comparison with other bacteria belonged to genus Psychrobacter. 相似文献
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正Rapid changes of Arctic sea ice cover have been in the focus of the international climate research community in recent years.Quite a few of nations have completed a large number of related surveys and research projects in the Arctic Ocean.Up to now,China has performed six research cruises to the Arctic Ocean resulting in a significant volume of research output.Improved knowledge on the atmospheree-sea ice-ocean interactions in the Arctic is a 相似文献
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The GRV 024516 and GRV 024517 meteorite samples collected from Grove Montains,Antactica are ureilite and H5 ordinary chondrite,respectively.Based on the study of mineralogy-petrology,the cosmic-ray exposure ages and gas retention ages of these two meteorites were determinated and calculated.Their cosmic-ray exposure ages are 33.3 Ma,51.7 Ma,and gas retention ages are 1936.8 Ma and 3720 Ma,respectively.The ureilite contains diamond,graphite and amorphous C,which are mainly carrier of noble gases indicating obviously shock metamorphism effects,which induced 40Ar partial loss.The H5 chondrite indicates thermal metamorphism of parent body,its gas retention age fall the range between 3220 Ma and 4510 Ma of the least shocked H5 chondrites 相似文献
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《极地研究(英文版)》2014,(3)
正1 Aims and Scope Advances in Polar Science(APS)is an international,peer-reviewed journal jointly sponsored by the Polar Research Institute of China and the Chinese Arctic and Antarctic Administration.APS is a comprchensive academic journal dedicated to presentation of multi-disciplinary achievements in Arctic and Antarctic expeditions and research.Its primary purpose is to publish achievements in fundamental research,applied 相似文献
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《山地科学学报》2014,(4):I0004-I0009
<正>AIMS AND SCOPE(Editorial Policy)The Journal of Mountain Science(JMS)is devoted to mountains and their surrounding lowlands-ecoregions of particular global importance,with a particular emphasis on the important highlands/mountains in the world,such as the Tibetan Plateau,the Himalayas,the Alps,the Andes,the Rockies and many other mountain ranges of our planet. 相似文献
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《山地科学学报》2014,(4)
<正>The Journal of Mountain Science(JMS),founded in2004,is an international English-language journal on mountain sciences.JMS is supervised by the Chinese Academy of Sciences(CAS),sponsored by the Chengdu Institute of Mountain Hazards and Environment,CAS,published by Science Press China,and distributed by Springer exclusively throughout the world(excluding Mainland China).The JMS is published bimonthly,fulltexted in SpringerLink and CNKI,indexed/abstracted by 相似文献