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1.
中国大陆地壳水平运动速度场与应变场 总被引：1，自引：0，他引：1
收集了中国大陆及周边地区GPS网的有关数据，提出了GPS网速度场的不同融合方法；经过融合建立了中国大陆及周边地区统一的地壳运动速度场，该速度场使用的有效GPS站共423个，其覆盖面积为1200万km^2；初步总结出中国大陆及周边地区地壳水平运动空间分布的基本特征；建立了板内块体的刚性弹塑性运动应变模型，对其进行了块体应变参数唯一性与速度残差中误差最小检验；根据中国大陆及周边地区的速度场，估计了8个块体的应变参数，分析了这些块体的应变状态，估计出的各个块体的应变状态与地质学、地球物理学方法估计的结果具有很好的一致性。用喜马拉雅块体主压应变方向估计的印度板块向欧亚板块碰撞力的主方向为北东7．1度。 相似文献
2.
GPS结果十分清晰地刻画出中国大陆地区块体运动及内部变形特征，提供了认识印度欧亚碰撞引起的活动构造的新视角．本文回顾了4年来中国学者在利用GPS研究现今地壳运动方面所取得的成就，以及在利用InSAR技术研究强震破裂方面的进展情况．这些研究成果，标志着中国大陆构造变形的定量化研究进入了一个新阶段. 相似文献
3.
Introduction To correctly understand the tectonic deformation of continental lithosphere, its dynamical mechanics and seismic activity, we should firstly acquire the velocity field and strain field of lithospheric tectonic motion with fine resolution and consistent accuracy (Molnar and Lyon-Caen, 1989; Molnar, 1990). And the quality, distribution and density of observed data are the basis for studying crustal tectonic deformation. In the past, crustal deformation is usually determined indi-r… 相似文献
4.
The continuous GPS observation at the fiducial stations in the Crustal Movement Observation Network of China (CMONOC) recorded
the crustal movement of Chinese mainland before and after the great Kunlun Mountain earthquake of M=8.1 on November 14, 2001, especially the horizontal crustal movement in the western part of China. Based on the datum defined
by a group of stable stations with small mutual horizontal displacements for a few years, the time series of horizontal displacements
at fiducial stations were obtained. Significant anomalous horizontal displacements had appeared at the fiducial stations in
the western part of China since early November 2000 and several earthquakes with the magnitudes about 6.0 had occurred in
Yunnan and Sichuan Provinces. The northward components of the horizontal displacement at the fiducial stations in west China
had decreased significantly and even changed in the opposite sense since mid April 2001. After the earthquake, the northward
displacements still decreased and there were significant westward displacements. The process of the crustal movement in the
western part of Chinese mainland (in reference to east China) suggests that the main force source for this earthquake came
from the northward pushing of the Indian plate. The great earthquake released a large amount of energy, as a result, the action
applied by the Indian plate to Chinese mainland diminished significantly and after the great earthquake, the seismic activity
in Chinese mainland decreased considerably until the end of 2002.
Foundation item: The National Development and Programming Project for Key Basic Research (95-13-03-07). 相似文献
5.
Horizontal movement and strain characteristics in Tianshan and its adjacent region with GPS deformation data 总被引：1，自引：0，他引：1
Introduction The Tianshan Mountain is the youngest cordillera in the present-day continental Asia, and its tectonic evolution is closely related to the collision and subduction between Indian Plate and Eurasian Plate in the Himalayas orogen since Cenozoic… 相似文献
6.
Model of rigid and elastic-plastic motion in intraplate blocks and strain status of principal blocks in Chinese mainland 总被引：5，自引：1，他引：5
Introduction The Chinese mainland is located in the southeastern part of Eurasia plate and encircled by India, Eurasia, Pacific and Philippine Sea plates. It is one of areas with the strongest tectonic de-formation, especially Qingzang (QinghaiXizang) plateau and NS tectonic zone where the tec-tonic activity is more intensive and intricate. The main part of tectonic activity of Chinese mainland includes a series of tectonic zones and active blocks divided by them. Therefore, the research… 相似文献
7.
Current crustal movement in Chinese mainland 总被引：2，自引：0，他引：2
王琪 《地震学报(英文版)》2003,16(5):574-582
The quantification of tectonic deformation in the Eastern and Central Asia is of great significance for the study on global plate motion and lithospheric dynamics. In the past four years, the velocity field of horizontal crustal movement for the Chinese mainland has been established for the first time thanks to the intensified GPS measure-ments and its improved accuracy. The velocity field derived from GPS measurements delineates the patterns of tectonic deformation in the Chinese mainland in the unprecedented detail, and thus reveals the new features of the ongoing tectonic process resulted from the collision of Indian plate to Eurasian plate. Meanwhile, the surface offset induced by two strong earthquakes occurred in Chinese mainland was sampled precisely using InSAR technique. 相似文献
8.
用有限元方法对中国大陆及邻区地壳与岩石圈运动进行动力学模拟. 以一个黏性薄板（牛顿黏滞、非牛顿黏滞）比拟中国大陆岩石圈，通过解力平衡方程得到中国大陆地壳相对于欧亚板块的运动速度分布，并与最新观测的GPS测量资料比较. 结果表明，造成中国大陆及邻区现今地壳运动及形变的主要动力来源为印度-欧亚板块碰撞及中国西部地区，特别是青藏高原的巨大重力位能. 相对而言，前者的贡献大于后者. 同时，构成中国大陆岩石圈的介质具有较强的非均匀流变特性，呈现出分块特征. 相似文献
9.
We simulate GPS horizontal velocity field in terms of rotations of crustal blocks to describe deformation behavior of the Chinese mainland and its neighboring areas.31 crustal blocks are bounded primarily by~30 Quaternary faults with distinct geometries and variable long-term rates of<20 mm/a,and 1 683 GPS velocities were determined from decade-long observations mostly with an averaged uncertainty of 1?2 mm/a.We define GPS velocity at a site by the combination of motion of rigid block and elastic strain ind... 相似文献
10.
利用中国大陆以及蒙古、 缅甸、 印度、 尼泊尔和喜马拉雅等周边地区多年的GPS观测资料, 基于连续介质假设, 采用双三次样条函数模拟方法, 给出中国大陆整体水平位移速度, 拟合精度优于3 mm/a, 获得了中国大陆的水平应变率场, 并分析了中国大陆现今构造变形、 水平应变率场的空间分布特征. 结果表明: 对大范围、 密集的GPS速度场的连续变形分析, 既能揭示中国大陆现今构造变形的总体特征, 又能显示局部地区现今的构造活动特征. 总体上, 中国大陆构造的水平变形强度和变形速度在南北地震带产生突变, 呈西强东弱、 南强北弱态势. 而昆仑山地块中部、 鲜水河断裂带和云南中部地区, 其应变速率最大, 速度变化最快; 阿尔金断裂带现今处于其构造活动的平静期, 中天山东部地区具有拉张环境. 相似文献
11.
Introduction The great Kunlun Mountain earthquake occurred on November 14, 2001 on the border be-tween Xinjiang and Qinghai in west China (36.2N, 90.9E). It was the largest earthquake oc-curred in Chinese mainland in the last 50 years. The Crustal Movement Observation Network of China (CMONOC) established in 1998 mainly for the purpose of earthquake prediction with only 25 fiducial stations for continuous GPS observations, has recorded the precious information of the crustal movement … 相似文献
12.
The continuous GPS observation at the fiducial stations in the Crustal Movement Observation Network of China (CMONOC) recorded the crustal movement of Chinese mainland before and after the great Kunlun Mountain earthquake of M=8.1 on November 14, 2001, especially the horizontal crustal movement in the western part of China. Based on the datum defined by a group of stable stations with small mutual horizontal displacements for a few years, the time series of horizontal displacements at fiducial stations were obtained. Significant anomalous horizontal displacements had appeared at the fiducial stations in the western part of China since early November 2000 and several earthquakes with the magnitudes about 6.0 had occurred in Yunnan and Sichuan Provinces. The northward components of the horizontal displacement at the fiducial stations in west China had decreased significantly and even changed in the opposite sense since mid April 2001. After the earthquake, the northward displacements still decreased and there were significant westward displacements. The process of the crustal movement in the western part of Chinese mainland (in reference to east China) suggests that the main force source for this earthquake came from the northward pushing of the Indian plate. The great earthquake released a large amount of energy, as a result, the action applied by the Indian plate to Chinese mainland diminished significantly and after the great earthquake, the seismic activity in Chinese mainland decreased considerably until the end of 2002. 相似文献
13.
中国地壳运动观测网络基准网GPS连续观测，获得了2001年11月14日昆仑山8.1级大地震前后中国大陆，特别是西部地区的地壳水平运动信息．以东部长期相互间相对水平位移很小的几个站组成的一组稳定点作为基准， 据此获得水平位移分量时间序列．2000年11月上旬起中国西部的GPS基准站开始出现显著的异常位移，此后在云南及四川发生多次6级左右的地震．自2001年4月中旬开始，中国西部GPS基准站向北的水平位移速率明显减小，甚至反向，临震前及震后略有恢复，但震后向北的水平位移速率仍减小，并有明显的向西运动．近几年中国大陆西部（相对东部）的地壳运动过程表明，印度板块的向北挤压是昆仑山8.1级大地震的主要力源，大地震释放了大量的能量，印度板块对中国大陆的作用力明显降低，大震后至2002年底中国大陆的地震活动也明显降低． 相似文献
14.
Current crustal motion and deformation in the Chinese mainland and its surrounding area determined from GPS data 总被引：1，自引：0，他引：1
Based on the geodetic data taken from the National GPS Network established by China Climbing Program "Investigation of Crust Motion and Geodynamics in Modern Time",we derived the movement velocities of the GPS sites. In terms of the power series expansion of a rotation function for horizontal velocities on a spherical surface proposed by Haines and Holt (1993), we computed the horizontal velocity and strain-rate field. We preliminarily studied the appearances and characteristics of the present-day crustal movement and deformation in the Chinese mainland with the computed results. The researches demonstrated: ① The present-day crustal movement and deformation in the Chinese mainland are being jointly controlled by Indian, Pacific and Philippines Ocean Plates and Siberia-Mongolia block, and these three large plates and block form a situation of tripartite confrontation, but Indian Plate seems to play a leading role; ② The North-South Earthquake Zone plays an important adjustment role in the present-day crustal movement and deformation process, displaying clear characteristics of demarcation line of tectonics in large areas; ③ There seems to be another adjustment zone along the latitude line approximate N35°, but its characteristics are less obvious than that of the former; ④ Dynamic actions of these three large plates and block on the Chinese mainland are dynamic stable; appearing in stable push-press velocities. These results are generally accorded with the results determined from geology, geophysics, and seismology. By the contrast with seismicities, it appears preliminarily that there is some corresponding relation between intense shear strain zone and future strong seismicity area, but this problem needs further examination of earthquake examples. 相似文献
15.
针对2015年4月25日尼泊尔Mw7.8地震的孕震特征,本文首先对覆盖尼泊尔及周边地区的5套GPS水平速度场结果进行了融合,得到了近似统一参考框架下的速度场结果;在此基础上通过对此次地震震源区及周边地区的速度场、应变率场、基线时间序列分析,识别了震前变形特征.GPS应变率场结果显示,喜马拉雅主边界断裂存在大范围挤压应变积累,震源区处于近南北向应变积累高值过渡区.跨喜马拉雅构造带的GPS基线时间序列结果表现为持续缩短现象,表明印度板块与欧亚板块之间的持续挤压变形特征,2012年以来的缩短增强现象反映了印度板块对青藏块体的推挤增强作用明显.距离震中较近的西藏南部GPS同震位移结果以南向运动为主且指向震中,反映了青藏高原存在逆冲应变释放现象.综合此次尼泊尔地震前变形和同震应变释放特征,认为此次地震的孕震区域和同震应变释放区域均较大,将会对青藏高原的地壳变形与强震孕育产生深远影响. 相似文献
16.
The paper introduces the horizontal crustal movement obtained from GPS observations in the regional networks (including the
basic network and the fiducial network) of the Crustal Movement Observation Network of China (CMONOC) carried out in 1999
and 2001. This paper is characterized by the acquisition of the horizontal displacement velocities during the period from
1999 to 2001 at the observation stations in the regional networks with datum definition of a group of stable stations with
small mutual displacements in east China. Based on the most detailed map of horizontal crustal movement in Chinese mainland,
the division of blocks, their displacements and deformations are studied. An approach to analysis of the intensity of the
horizontal crustal deformation is proposed. The general characteristics of the recent horizontal crustal movement in Chinese
mainland and that before the Kunlunshan earthquake of M=8.1 on November 14, 2001 are analyzed.
Foundation item: The National Development and Programming Project for Key Basic Research (95-13-03-07). 相似文献
17.
On the basis of the GPS data obtained from repeated measurements carried out in 2004 and 2007,the horizontal principal strain of the Chinese mainland is calculated,which shows that the direction of principal compressive strain axis of each subplate is basically consistent with the P-axis of focal mechanism solution and the principal compressive stress axis acquired by geological method.It indicates that the crustal tectonic stress field is relatively stable in regions in a long time.The principal compressive stress axes of Qinghai-Tibet and Xinjiang subplates in the western part of Chinese mainland direct to NS and NNE-SSW,which are controlled by the force from the col-lision of the Eurasia Plate and India Plate.The principal compressive strain axes of Heilongjiang and North China subplates in the eastern part direct to ENE-WSW,which shows that they are subject to the force from the collision and underthrust of the Eurasia Plate to the North America and Pacific plates.At the same time,they are also af-fected by the lateral force from Qinghai-Tibet and Xinjiang subplates.The principal compressive strain axis of South China plate is WNW-ESE,which reflects that it is affected by the force from the collision of Philippine Sea Plate and Eurasia Plate and it is also subject to the lateral force from Qinghai-Tibet subplate.It is apparent from the comparison between the principal compressive strain axes in the periods of 2004～2007 and 2001～2004 that the acting directions of principal compressive stress of subplates in both periods are basically consistent.However,there is certain difference between their directional concentrations of principal compressive stress axes.The sur-face strain rates of different tectonic units in both periods indicate that the events predominating by compressive variation decrease,while the events predominating by tensile change increase. 相似文献
18.
A method for computing crustal horizontal velocities and strain-rates using repeated GPS survey and other crustal deformation measurement was presented in detail. Based on the data taken from the Crustal Deformation Monitoring-Networks with GPS in the whole country and North China, we derived the average horizontal velocities of the points of the networks and simulated the horizontal velocity and strain-rate fields in the corresponding areas. From these results, we can conclude: (1) GPS can effectively detect current crustal motion and deformation, and (2) the method presented in the paper is valid, and through its use, calculated results can provide more information about current crustal motion and deformation than direct observation data. 相似文献
19.
Crustal movement and deformation in Taiwan and its coastal area 总被引：1，自引：0，他引：1
Introduction Both Taiwan Island and Chinese mainland belong to Eurasian plate in geological structure. And the nearest distance between Taiwan Island and Fujian Province, which is located on the opposite coast, is only 130 km. Although there are high-precision GPS networks in both Taiwan and Fujian Province, joint GPS measurement cannot be made directly because of the inconvenient contact due to the strait between them. However, the GPS networks arranged on b… 相似文献
20.
Introduction In the years when the reliable data could not be obtained and in the analysis of strain property and magnitude in history, the intensity, property and activity pattern of strain field were mainly inferred on the bases of geometric characters of surface traces and behaviors (especially the faults) as well as the characteristics of petrology (XIE, et al, 1993; Molnar, Tapponnier, 1975, 1977; Tapponnier, Molnar, 1977; FU, et al, 2000). However, they are the averaged results accumu… 相似文献