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| Aseismic negative dislocation model and deformation analysis of crustal horizontal movement during 1999~2001 in the northeast margin of Qinghai-Xizang block | |
| 作者姓名： | 张希 江在森 王琪 王双绪 张晓亮 |
| 作者单位： | The Second Crustal Deformation Monitoring Center，China Seismological Bureau，Xian 710054，China，Center for Analysis and Prediction，China Seismological Bureau，Beijing 100036，China，Institute of Seismology，China Seismological Bureau，Wuhan 430071，China，The Second Crustal Deformation Monitoring Center，China Seismological Bureau，Xian 710054，China，The Second Crustal Deformation Monitoring Center，China Seismological Bureau，Xian 710054，China |
| 基金项目： | State Key Basic Development and Programming Project Mechanism and Prediction of Continental Strong Earthquakes (G1998040703)，Joint Seismological Science Foundation of China (603001). |
| 摘 要： | Introduction So small is the hypocenter area of strong earthquake, but its formation is controlled by time-space evolution of present-day crustal movement in wider-range area, and related to motion and deformation of active blocks and their boundary faults. Aseismic negative dislocation model presented by Matsuura, et al (1986) is that, the relative motion between blocks driven by present-day crustal movement may be partly locked at the block … |
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 ZHANG Xiao-liang The Second Crustal Deformation Monitoring Center,China Seismological Bureau,Xian ,China Center for Analysis and Prediction,China Seismological Bureau,Beijing ,China Institute of Seismology,China Seismological Bureau,Wuhan ,China.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). | |
| Authors: | ZHANG Xi JIANG Zai-sen WANG Qi WANG Shuang-xu ZHANG Xiao-liang The Second Crustal Deformation Monitoring Center China Seismological Bureau Xian China Center for Analysis and Prediction China Seismological Bureau Beijing China Institute of Seismology China Seismological Bureau Wuhan China |
| Institution: | 1. The Second Crustal Deformation Monitoring Center, China Seismological Bureau, Xi'an 710054, China 2. Center for Analysis and Prediction, China Seismological Bureau, Beijing 100036, China 3. Institute of Seismology, China Seismological Bureau, Wuhan 430071, China |
| 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. |
| Keywords: | the northeast margin of Qinghai-Xizang block GPS crustal horizontal movement aseismic negative dislocation model apparent strain field |
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