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北京凹陷的
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  beijing depression
     The investigation of the earthquake damages during the Tangshan big earthquake of 1976 showed that the distribution of anomalous zones of shock calamities in Beijing City corresponds to the two wings of the Beijing depression.
     1976年唐山大地震震害调查表明,北京城区震害异常带的分布与北京凹陷的西北及东南两翼相对应。
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In Beijing plain area the tectonic settings during the Tertiary period having an upheaval in its northwestern part, a depression in its central part and Dai Xing upheaval suffered remarkable changes in the course of recent tectonic movement. From the repeated levelling data it is suggested that along the NW trending Nankou-Sunhe fault was generated a subsidence zone cutting across the NE trending Tertiary structure and destroying the original tectonic framework.In connection with this the recent strain field...

In Beijing plain area the tectonic settings during the Tertiary period having an upheaval in its northwestern part, a depression in its central part and Dai Xing upheaval suffered remarkable changes in the course of recent tectonic movement. From the repeated levelling data it is suggested that along the NW trending Nankou-Sunhe fault was generated a subsidence zone cutting across the NE trending Tertiary structure and destroying the original tectonic framework.In connection with this the recent strain field also shows an obvious change. From the deformation tendency plot compiled on the basis of repeated levelling data the long axis of contour lines takes the direction from nearly east-west to north-west-west reflecting a tensile direction on the earth's surface. Further triangulation surveys indicate that the tensile direction is south-east, the compression direction is north-east in the Beijing plain area. The tensile strain amounts to 2.5/10-6, while the compression strain is 0.8/10-6, much lesser than the former.Some faults in this area have showed anomalous activities before the Tangshan earthquake. During the period of 1973-1976, six faults have a tendency of increasing or reversing activities, but in 1976, four of them rebounded to the same situation as in 1973. It is preliminarily belived that the activities of these faults may be related to the 1976 's Tangshan earthquake.

从测量资料的研究得知北京平原地区的现代构造形态与第三纪形成的京西北隆起、北京凹陷、大兴隆起等不相符合。由于出现一个北西向的下降带,使原来“两隆夹一凹”的构造形态可能解体。同时,应变场也起了变化,认为该地区目前处在南东方向的拉伸应力场中。

The Beijing sag.Daixing rise,Dachsng sag and Baodi rise Beijing-Tianjin region are the composition parts of the Jizhong depression.The combinations of Source-Reservoir-Seal are nice in this region,so that it posesses the conditions of forming various types of oil and gas pools and should be an advantageous region for hydrocarbon exploration,especially in east and west declivities of Daxing rise and in this part where Baoxing rise extends to the sag.

京津地区的北京凹陷、大兴凸起、大厂凹陷及宝坻凸起均应是冀中拗陷的组成部分。该区的生储盖层组合良好,且具有形成多种类型油、气藏的条件,应是勘探油、气的有利地区,尤以大兴凸起的东、西坡和宝抵凸起伸向凹陷的部位更为有利。

The Wang Gong Chang Gun-powder plant explosion was a strange catastrophic event in the late Ming Dynasty.In this paper, the author make full use of the results obtained from two-dimensional finite element method of seismic response analysis and supersonic seismic modelling in recent years,and put foward a proposal that the reflection of vibrating wave ray due to buried bedrock topography underloose overlying soil layers may be one of the causes of the enlarged disaster. Whether natrual earthquake or man-made...

The Wang Gong Chang Gun-powder plant explosion was a strange catastrophic event in the late Ming Dynasty.In this paper, the author make full use of the results obtained from two-dimensional finite element method of seismic response analysis and supersonic seismic modelling in recent years,and put foward a proposal that the reflection of vibrating wave ray due to buried bedrock topography underloose overlying soil layers may be one of the causes of the enlarged disaster. Whether natrual earthquake or man-made explosion, both of them can make convergence of the vibrating wave ray,and strengthen the vibrating energy, making the hazard more serious, because the Wang Gong Chang Gun powder Plant was just situated above the centre of the concave bedrock surface of Beijing Depression This is a new problem in urban disaster geology. In the conclusion, some concrete suggestions were advanced in unfolding disaster geological reseach as well.

明末北京王恭厂药局爆炸是一次奇案,本文利用作者近几年所进行的二维有限元地震反应分析及超声地震模型实验所获成果提出:松散复盖层下埋藏基岩地形对振波射线的反射可能是此次灾情被扩大的原因之一,不论是天然地震或人为爆炸,由于王恭厂恰处于北京凹陷埋藏基岩凹曲面中心,振波射线的汇聚使振动能量局部集中,从而扩大和加重了灾害,这是一项城市灾害地质学的新课题。文中还提出了开展灾害地质学研究的具体倡议。

 
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