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tangshan earthquake region
相关语句
  唐山震区
     DIFFERENCES OF CRUSTAL STRUCTURES IN NORTHEASTERN EDGE OF TIBET PLATEAU, ORDOS AND TANGSHAN EARTHQUAKE REGION IN NORTH CHINA-RESULTS OF DEEP SEISMIC SOUNDING
     青藏高原东北缘、鄂尔多斯和华北唐山震区的地壳结构差异——深地震测深的结果
短句来源
  华北唐山震区
     DIFFERENCES OF CRUSTAL STRUCTURES IN NORTHEASTERN EDGE OF TIBET PLATEAU, ORDOS AND TANGSHAN EARTHQUAKE REGION IN NORTH CHINA-RESULTS OF DEEP SEISMIC SOUNDING
     青藏高原东北缘、鄂尔多斯和华北唐山震区的地壳结构差异——深地震测深的结果
短句来源
  唐山地震区
     STRUCTURAL PROPERTY OF THE CRUST AND THE UPPER MANTLE IN THE TANGSHAN EARTHQUAKE REGION——A METHOD OF COMPUTING BODY WAVE THEORETICAL SEISMOGRAM AND THE RESULT OF ANALYSIS OF 2-D INHOMOGENEOUS MEDIA
     唐山地震区地壳上地幔结构特征——二维非均匀介质中理论地震图计算和结果分析
短句来源
     The high-precision digital seismic data for the Tangshan earthquake region were processed by the spectrum method.
     利用频谱分析方法处理了我大队在唐山地震区取得的高精度的数字地震记录资料。
短句来源
  “tangshan earthquake region”译为未确定词的双语例句
     It takes earthquakes with Ms≥5.5 in Minor North China and those with Ms≥4.5 in Tangshan earthquake region for example analyses.
     对小华北地区M_S>≥5.5地震,唐山老震区M_S≥4.5地震进行了震例分析。
短句来源
     By analysing the short period geodetic data obtained in the 1976 Tangshan earthquake region before and after the earthquake, it can be demonstrated that precursory creep had occurred in the upper crust of the epicentral area prior to the main shock and the fault continued to slip after it but the rate fell off exponentially with time.
     根据1976年唐山地震前后在地震区取得的短期观测资料的分析,论证了唐山主震前夕在极震区地壳上部曾发生过前兆蠕动,而且主震后断层仍继续滑动,但其速率呈指数型衰减.
短句来源
     Strong earthquakes occurred frequently in North China area in history,but it showed tranquil since 2000.In order to analyze this phenomenon,we studied the joint area of Shanxi,Hebei and Inner Mongolia,the joint area of Hebei,Shandong and Henan province,Tangshan earthquake region, Yinshan Mountain and Yanshan Mountain earthquake belt with linear probability method that based on spectral analysis of earthquake.
     华北地区历史地震频繁,2000年以来出现地震平静现象,为了更好地对这一现象进行分析,我们利用基于地震周期谱分析的线性合成概率预测方法,针对晋冀蒙交界地区、冀鲁豫交界地区、唐山老震区、阴山燕山地震带进行研究。
短句来源

 

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      tangshan earthquake region
    The authors have processed the observed data in Tangshan earthquake region by the method proposed in this paper, and obtained the tomographic results of the middle and upper crust structures in this region.
          


    The earth crust evolution under the North China basin since Cenozoic Era can be roughly divided into two stages: firstly, this basin was progressively extending since early Tertiary, with the result of wide development of normal faults and a series of depressions, where accumulated voluminous Cenozoic sediments. Then the extension rate of the earth crust was gradually decreasing at the end of Late Tertiary and eventually turned to be ENE-ward horizontal compression and vertical movement.The seismic.sounding...

    The earth crust evolution under the North China basin since Cenozoic Era can be roughly divided into two stages: firstly, this basin was progressively extending since early Tertiary, with the result of wide development of normal faults and a series of depressions, where accumulated voluminous Cenozoic sediments. Then the extension rate of the earth crust was gradually decreasing at the end of Late Tertiary and eventually turned to be ENE-ward horizontal compression and vertical movement.The seismic.sounding shows that the Xiadian and Tangshan-Ninghe faults have deeply cut through the crust and the thickness of the crust is 36km at Tangshan and 38km at Xiadian.The gravity variation of the Tangshan earthquake region from March to July,1976 before mainshock was about 200 microgals. The depth of the density interface (or discontinuity) causing the gravity variation of the Tangshan area as conjectured from the Beijing-Leting gravity variation curve is about 36km. It has uplifted about 1m under Tangshan. The amount of density change at Tangshan was estimated from the density interface formula as 2.17 × 10-4g/cm3 and - 1.46 × 10-4g/cm3 at Xiadian. Tha gravity anomalies at Tangshan and Xiadian must be considered together as two integral sides of the same movement entity. It is supposed that the North China basin has been subjected to ENE-ward horizontal compression, which gave rise to the activation of the Tangshan deep fault and the upwelling of upper mantle hot material to increase the density.

    华北盆地自晚第三纪末期或第四纪以来,地壳拉张速率逐渐减弱,相继转为北东东向水平挤压和上下运动。夏垫、唐山-宁河断裂为深切地壳的断裂。唐山震区震前重力变化约为正200微伽(76年3月—76年7月)。依据北京—乐亭重力变化曲线,推断引起唐山重力变化的密度界面深度约为36公里,上隆约1米,而夏垫相应下降。同时根据密度界面公式来估算震源附近密度变化量,唐山为2.17×10~(-4)克/厘米~3,夏垫为-1.46×10~(-4)克/厘米~3。

    In order to set up the relation between fault creeping and crustal deformation in the neighbourhood of it, in this paper, analytical expressions for quasi-static deformation field produced by a slipping f auit of arbitrary dip in a linear viscoelastic half-space are given in closed forms. The forms of slip-time function in the expressions are determined empirically, and the rock media are considered as generalized Kelvin's or Maxwell substances. The effect of viscoelasticity on the deformation field has been...

    In order to set up the relation between fault creeping and crustal deformation in the neighbourhood of it, in this paper, analytical expressions for quasi-static deformation field produced by a slipping f auit of arbitrary dip in a linear viscoelastic half-space are given in closed forms. The forms of slip-time function in the expressions are determined empirically, and the rock media are considered as generalized Kelvin's or Maxwell substances. The effect of viscoelasticity on the deformation field has been discussed through numerical computation. By analysing the short period geodetic data obtained in the 1976 Tangshan earthquake region before and after the earthquake, it can be demonstrated that precursory creep had occurred in the upper crust of the epicentral area prior to the main shock and the fault continued to slip after it but the rate fell off exponentially with time. The slip parameters which fit the observed data are estimated and the implication of all these results are briefly discussed.

    为了建立断层蠕动与其周围地壳形变的关系,本文给出了线性粘弹性半空间中任意倾角的断层滑动引起的准静态位移场的完整的解析表达式.其中,滑动时间函数的形式是根据经验拟定的,而介质被视为广义开尔文体或麦克思韦体.通过数值计算讨论了介质的流变性对位移场的影响.根据1976年唐山地震前后在地震区取得的短期观测资料的分析,论证了唐山主震前夕在极震区地壳上部曾发生过前兆蠕动,而且主震后断层仍继续滑动,但其速率呈指数型衰减.估算了符合观测数据的断层滑动参数,并对这些结果的意义作了简要的讨论.

    In order to study the propagation of waves in 2-D laterally inhomogeneous isotropic and absolute elastic media with curved interfaces, it is appropriate to calculate the wavefield using the solution of high frequency approximate expansion for elastic wave equation, under certain conditions.For the purpose of solving the system of twopoint ray tracing under certain initial conditions, the standard program (the method of Runge-Kutta) has been used. The geometrical spreading factor is determined by solving a system...

    In order to study the propagation of waves in 2-D laterally inhomogeneous isotropic and absolute elastic media with curved interfaces, it is appropriate to calculate the wavefield using the solution of high frequency approximate expansion for elastic wave equation, under certain conditions.For the purpose of solving the system of twopoint ray tracing under certain initial conditions, the standard program (the method of Runge-Kutta) has been used. The geometrical spreading factor is determined by solving a system of two linear ordinary differential equations of the first order (the socalled dynamic ray tracing system) with a modified Euler's method. These are realized by the Seis 83 progam.In the present paper, the authors gave calculated with the Stis 83 program the observed data from two profiles (the Baigezhang-Fengnan-Fengning-Zhenglangqi profile and the Cang-zhou-Tianjin-Kelaqinzuyi profile) which pass through the epicentral region of the Tangshan earthquake where they intersect each other approximately perpendicularly. The structural property of the crust and the upper mantle in the Tangshan earthquake region and the relation between the Seismicity and the velocity distribution in the low-velocity layer of the crust are discussed.

    研究具有弯曲介面、各向同性、完全弹性的二维非均匀介质中波的传播问题,在一定条件下,弹性动力学方程的射线级数逼近法的高频渐近解可以对波场作近似计算。采用标准数字程序(龙克-库塔法)求解具有初始条件的两点射线追踪,用改进了的Euler法求解两个一阶线性微分方程计算几何扩散因子。整个计算过程由Seis 83程序包实现。 本文利用Seis 83程序包,对通过唐山地震区相互交叉的柏各庄—丰南—丰宁—正兰旗剖面和沧州—天津—喀左剖面的实测资料进行解释,进一步获得唐山地震区地壳上地幔的构造特征,以及与地震活动较为关系密切的壳内低速度层的速度分布规律。

     
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