| Aseismic negative dislocation model and deformation analysis of crustal horizontal movement during 1999——2001 in the northeast margin of Qinghai-Xizang block |
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| 引用本文： | 张希,江在森,王琪,张晓亮.Aseismic negative dislocation model and deformation analysis of crustal horizontal movement during 1999——2001 in the northeast margin of Qinghai-Xizang block[J].地震学报(英文版),2003,16(4):395-403. |
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| 作者姓名： | 张希 江在森 王琪 张晓亮 |
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| 作者单位： | [1]TheSecondCrustalDeformationMonitoringCenter,ChinaSeismologicalBureau,Xi‘an710054,China [2]CenterforAnalysisandPrediction,ChinaSeismologicalBureau,Belting100036,China [3]InstituteofSeismology,ChinaSeismologicalBureau,Wuhan430071,China |
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| 摘 要： | Through numerical simulation for GPS data, aseism/c negative dislocation model for crustal horizontal movement during 1999-2001 in the northeast margin of Qinghai-Xizang block is presented, combined with the spatial distri-bution of apparent strain field in this area, the characteristics of motion and deformation of active blocks and their boundary faults, together with the place and intensity of strain accumulation are analyzed. It is shown that: a) 9 active blocks appeared totally clockwise motion from eastward by north to eastward by south. Obvious sinistral strike-slip and NE-NEE relative compressive motion between the blocks separated by Qilianshan-Haiyuan fault zone was discovered; b) 20 fault segments (most of them showed compression) locked the relative motion between blocks to varying degrees, among the total, the mid-east segment of Qilianshan fault (containing the place where it meets Riyueshan-Lajishan fault) and the place where it meets Haiyuan fault and Zhuanglanghe fault, more favored accumulation of strain. Moreover, the region where Riyueshan-Lajishan fault meets north boundary of Qaidam block may have strain accumulation to some degree, c) Obtained magnitude of block velocities and locking of their boundaries were less than relevant results for observation in the period of 1993-1999.
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| 关 键 词： | GPS 全球定位系统 地壳水平移动 地壳形变 强地震 应变 耐震负位错模型 青海-西藏地区 |
| 收稿时间： | 1 July 2002 |
| 修稿时间： | 8 February 2003 |
Aseismic negative dislocation model and deformation analysis of crustal horizontal movement during 1999–2001 in the northeast margin of Qinghai-Xizang block |
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| Zhang Xi , Jiang Zai-sen , Wang Qi , Wang Shuang-xu and Zhang Xiao-liang.Aseismic negative dislocation model and deformation analysis of crustal horizontal movement during 1999–2001 in the northeast margin of Qinghai-Xizang block[J].Acta Seismologica Sinica(English Edition),2003,16(4):395-403. |
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| Authors: | Zhang Xi Jiang Zai-sen Wang Qi Wang Shuang-xu and Zhang Xiao-liang |
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| Institution: | (1) The Second Crustal Deformation Monitoring Center, China Seismological Bureau, 710054 Xi’an, China;(2) Center for Analysis and Prediction, China Seismological Bureau, 100036 Beijing, China;(3) Institute of Seismology, China Seismological Bureau, 430071 Wuhan, China |
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| Abstract: | Through numerical simulation for GPS data, aseismic negative dislocation model for crustal horizontal movement during 1999–2001
in the northeast margin of Qinghai-Xizang block is presented, combined with the spatial distribution of apparent strain field
in this area, the characteristics of motion and deformation of active blocks and their boundary faults, together with the
place and intensity of strain accumulation are analyzed. It is shown that: a) 9 active blocks appeared totally clockwise motion
from eastward by north to eastward by south. Obvious sinistral strike-slip and NE-NEE relative compressive motion between
the blocks separated by Qilianshan-Haiyuan fault zone was discovered; b) 20 fault segments (most of them showed compression)
locked the relative motion between blocks to varying degrees, among the total, the mid-east segment of Qilianshan fault (containing
the place where it meets Riyueshan-Lajishan fault) and the place where it meets Haiyuan fault and Zhuanglanghe fault, more
favored accumulation of strain. Moreover, the region where Riyueshan-Lajishan fault meets north boundary of Qaidam block may
have strain accumulation to some degree. c) Obtained magnitude of block velocities and locking of their boundaries were less
than relevant results for observation in the period of 1993–1999.
Foundation item: State Key Basic Development and Programming Project “Mechanism and Prediction of Continental Strong Earthquakes” (G1998040703)
and Joint Seismological Science Foundation of China (603001). |
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| Keywords: | the northeast margin of Qinghai-Xizang block GPS crustal horizontal movement aseismic negative dislocation model apparent strain field |
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