| 用GPS研究南天山（伽师）地区现今地壳变形 |
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| 引用本文： | 王琪,丁国瑜,乔学军,王晓强.用GPS研究南天山（伽师）地区现今地壳变形[J].地震学报,2000,22(3):263-270. |
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| 作者姓名： | 王琪 丁国瑜 乔学军 王晓强 |
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| 作者单位： | 1)中国武汉430071 中国地震局地震研究所
2)中国北京100036中国地震局分析预报中心
3)中国乌鲁木齐830011新疆维吾尔自治区地震局 |
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| 基金项目： | “九五”国家科技重点项目!(攻关 ) ( 96-91 3 -0 7-0 3 )，国家自然科学基金，攀登项目，地震科学联合基金!( 1 970 68) |
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| 摘 要： | 伽师地区现今地壳运动方式、变动幅度和形变应变特征对研究该地区孕震环境具有重要作用．利用1994和1998年两次GPS大地测量，我们监测到伽师地区相对于北天山哈萨克地块的地壳缩短速率大约为19mm/a，与20世纪以来地震学（地震矩张量）资料估计的速率（约13mm/a）相比，GPS测定的速率高约50％．大地测量与地震学对南天山（伽师）地区地壳运动速率的估值差异，既可能说明该地区20世纪以来存在大量无震、震间应变，也可能表示至今与地震活动有关的断层变动尚不足以消减整个天山地区的现今变形．无论何种可能，从应力应变积累的角度看，都意味着天山西段及帕米尔东北侧一带发生强震的可能性将长期存在．
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| 关 键 词： | 天山 地壳运动 GPS测量 |
RESEARCH ON PRESENT CRUSTAL DEFORMATION IN THE SOUTHERN TIANSHAN (JIASHI), CHINA BY GPS GEODESY |
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| Wang Qi- Ding Guoyu- Qiao Xuejun- Wang Xiaoqiang- Institute of Seismology,China Seismological Bureau,Wuhan ,China Center for Analysis and Prediction,China Seismological Bureau,Beijing ,China Seism.RESEARCH ON PRESENT CRUSTAL DEFORMATION IN THE SOUTHERN TIANSHAN (JIASHI), CHINA BY GPS GEODESY[J].Acta Seismologica Sinica,2000,22(3):263-270. |
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| Authors: | Wang Qi- Ding Guoyu- Qiao Xuejun- Wang Xiaoqiang- Institute of Seismology China Seismological Bureau Wuhan China Center for Analysis and Prediction China Seismological Bureau Beijing China Seism |
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| Institution: | Wang Qi- 1) Ding Guoyu- 2) Qiao Xuejun- 1) Wang Xiaoqiang- 3) 1) Institute of Seismology,China Seismological Bureau,Wuhan 430071,China 2) Center for Analysis and Prediction,China Seismological Bureau,Beijing 100036,China 3) Seism |
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| Abstract: | The pattern and range of present crustal movement as well as characteristic of deformation strain play a key role in cognizing seismogenic mechanism in the Jiashi, Xinjiang, northwestern China. Using GPS geodesy in 1994 and 1998, here we give geodetic evidence of rapid convergence of about 19 mm/a across the western Tianshan, which is about 50% greater than the seismic moment solution (13 mm/a) by estimateon of major earthquake in the 20th century. The discrepancy of deformation rate between geodetic observation and seismic energy releasing indicates, not only there exist a lot of aseismic and inter seismic strain in the western Tianshan, but also seismic fault slip in this century could not enough to compensate actively faulting and folding in the whole area. Whichever it maybe, from the view of accumulation of stress strain, it suggests that there will be potential strong earthquakes in the western segment of Tianshan and the northeastern corner of Pamir in a long period. |
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| Keywords: | Tianshan crustal deformation GPS |
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