A preliminary research establishing the present-time intraplate blocks movement model on the Chinese mainland based on GPS data   总被引：4，自引：0，他引：4  

Shuo-Yu Zhou  Yue-Gang Zhang  Guo-Yu Ding  Yun Wu  Xiao-Jun Qin  Shun-Ying Shi  Qi Wang  Xin-Zhao You  Xue-Jun Qiao  Ping Shuai  Gan-Jin Deng 《地震学报(英文版)》1998,11(4):403-412

The Chinese mainland is regarded as the best area for studying the continental crustal movement and dynamics. In the past, based on the ground surface observation, it was very difficult to study the movement of the intraplate blocks within a range of larger space and a time scale of several years quantitatively. In this paper, a method of calculating the Euler vectors of present-time motion among blocks by using Cardan angles has been given completely based on two periods of GPS repetition measurement data of the National Ascending Plan of China (NAPC) — the study and application of current crustal movement and geodynamics in 1994 and 1996. A present-time blocks movement model on the Chinese mainland (PBMC-1), which describes the motion of seven blocks—Tibet, Chuan-Dian, Gan-Qing, Xinjiang, South China, North China and Heilongjiang block, is established preliminarily. The velocity field of the relative motion among the intraplate blocks and boundary motion in the Chinese mainland are firstly given within several years time scale. It is shown by the results calculated with the model that the velocity-rate of each block is reduced gradually from the south to north and from the west to east, and the motion direction changes gradually from NNE to E, even SEE or SE. The collision of Indian plate plays a leading role in the movement of the intraplate blocks in the Chinese mainland, while the motion manner and velocity-rate of block boundary zone (fracture zone) depend on the motion of every block again. The present-time motion of a time scale of several years computed with the model is not only largely consistent with the average motion of a time scale of several million years derived from geology, but also very coincident with the results of geophysical and astronomic observation. It is shown preliminarily that the observed results of space geodesy techniques such as GPS etc. are capable of discovering the crustal movement at present. This study is supported by the National Natural Science Foundation of China (NNSFC), National Ascending Plan of China (NAPC) and Chinese Joint Seismological Science Foundation (CJSSF).  相似文献   

The influence of neo-tectonics on river patterns in Bangladesh; a preliminary study based on Landsat MSS imagery     

Seijmonsbergen  A.C. 《Geologie en Mijnbouw》1998,77(2):129-135

Bangladesh is part of the active foredeep depression south of the Himalayan collision zone, bordering the Indian plate. Seismic activity is common both in the mountain chain and in the Ganga plain reaching into the basin of the Bay of Bengal and forming the counterpart of the uplifted Himalayan chain. Erosion, sedimentation, river migration and transport within the Jamuna (Brahmaputra) river system are therefore not only controlled by processes on the Earth's surface, but are also the result of a balance between fast and continuing deposition versus geological subsidence and uplift. An attempt is made to correlate the behaviour of the Jamuna river to neo-tectonic movements, as interpreted from Landsat MSS imagery using available literature. From the imagery, covering the period 1976 to 1987, supervised and unsupervised classifications of bands 5 and 7 were made. The 1978 and 1986 images revealed the most useful classifications and yielded pronounced differences in colour variation for visual interpretations of geological lineaments and terrain units. The Jamuna riverbed can be divided into compartments, limited by faults.  相似文献   

论南秦岭加里东运动   总被引：2，自引：1，他引：1  

王根宝  冯华  焦建宏 《陕西地质》1998,(1)

诸多资料显示南秦岭加里东运动为一次非造山性质的地壳组份与板块结构的调整。具体表现为原扬子板块北缘的裂解、伸展变形和绿片老相变质作用以及岩浆活动和成矿作用等多种形式。  相似文献   

东营通61断块沙河街组二段沉积微相特征及对油藏形成的控制作用   总被引：9，自引：2，他引：7  

刘家铎  田景春 《矿物岩石》1998,18(1):33-39

本文利用沉积学、测井地质学和地震地层学知识,详细研究了东营通６１断块下第三系沙河街组二段地层的沉积微相类型及其特征。在此基础上编制了不同小层沉积微相的平面展布图,提出该地区的沉积微相序列模式。并讨论了沉积微相对油藏形成的控制作用。  相似文献   

岩石力学联锁咬合岩块结构稳定性分析   总被引：3，自引：1，他引：2  

吴洪词  张小彬 《岩土力学》1998,19(4):36-40

首次建立了岩石力学中的多种联锁咬合岩块结构模型,介绍了块体理论的进展,并采用改进的DDA（块体不连续变形分析）法对块体进行了稳定性分析。  相似文献   

“9.16”前后的断层水平形变     

刘丰 《福建地震》1998,(1)

本文将前楼,朱坑的小三角观测资料通过亏自由网平差方法加以处理,用三倍误差椭圆曲线作为判定异常的基本依据。“9.16”地震前一年以内,断层的水平形变很好地呈现出了前兆异常信息,地震的发生与断层的水平形变表现两者之间有着极其紧密的联系。  相似文献   

板内块体现今刚性运动模型研究     

张跃刚  周硕愚 《大地测量与地球动力学》1998,(1)

应用欧拉矢量方法,建立了板内块体运动模型。根据运动模型,应用全国ＧＰＳ地壳运动监测网２期观测结果,计算了我国大陆板内块体的现今运动量。ＧＰＳ计算结果与板内块体运动的地质结果比较,二者的可比性反映了我国大陆板内块体在全球板块运动影响下的总体运动趋势。  相似文献   

借助最小二乘配置整体解算地壳视应变场   总被引：3，自引：2，他引：1  

张希  江在森  张四新 《大地测量与地球动力学》1998,(2)

研究利用多手段（ＧＰＳ、跨断层等）形变资料,结合定点应变数据解算地壳视应变场的方法,包括利用间接平差法求单元内部的均匀视应变及借助最小二乘配置求水平视应变连续分布。对华北地区ＧＰＳ监测网１９９２年、１９９５年和１９９６年３期成果进行计算分析,得到其视应变场动态图像。  相似文献   

豫西中新生代地球动力学探讨     

司马献章 《河南国土资源》1998,(3)

以隆断区和断陷盆地地壳厚度的显著差异,隆断区与盆地分界的深大断裂（边缘断裂,与地幔斜坡对应）,隆断区和盆地的岩浆作用及现代地热活动,盆地沉降历史四个地质特征为依据,作者认为本区盆岭构造形成的动力学机制是：中新生代上地幔起伏和下地壳不均匀岩浆熔融并由此产生的岩浆作用和热能、重力地质作用等引起的物质膨胀和岩浆侧向上侵入、岩浆冷凝和体积收缩导致同沉积断层运动,形成本区盆岭构造。  相似文献   

用于变形分析的L—X—1‘平差方法     

周扬眉 《华东地质学院学报》1997,20(1):83-87

为了直接处理含有粗差的变形观测数据，文献（１）提出了Ｌ－Ｘ－１平差模型，但这种Ｌ－Ｘ－平差模型解的唯一性较差，为此，本文提出了Ｌ－Ｘ－１‘平差方法，该方法与Ｌ－Ｘ－１平差比较，更容易得到唯一的平差结果，且计算起来方便。  相似文献