南天山及帕米尔高原现代地壳水平形变
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摘要
通过对南天山及帕米尔高原GPS监测网的观测,获得了该地区的现今地壳形变速率图、基线变化图、应变图及主要地质构造带的断裂位移。结果表明,南天山及帕米尔地区地壳运动幅度较大,受印度板块的推挤作用,地壳正快速缩短变形,并且该区域的地壳形变具有自西向东、自南向北减弱的特点。另外,南天山地震断裂带以每年5~10mm的速度吸收来自帕米尔高原向北推挤的运动速率。通过研究还发现,喀什以西地区是强剪应力汇集的地区,地壳活动极其复杂、强烈。
Based on the result observed by GPS network in south Tianshan and Pamir Plateau,the crustal deformation rate map,baseline varying map,strain map,and the fault displacements of main geological structure zones were obtained.It is shown that the crustal movement in south Tianshan and Pamir Plateau has large amplitude which is pushed and squeezed by the India Plate,and is shortening and deforming rapidly,and the deformation tends is decreased from west to east and from south to north.In addition,the south Tianshan seismic belt absorbs the rate from the pressure toward north acted by Pamir Plateau by the rate of 5～10 mm a year.It is also discovered that there is strong shearing stress converging in the area of western Kashi in Xinjiang,where the crustal activity is extremely strong and complex.
Based on the result observed by GPS network in south Tianshan and Pamir Plateau,the crustal deformation rate map,baseline varying map,strain map,and the fault displacements of main geological structure zones were obtained.It is shown that the crustal movement in south Tianshan and Pamir Plateau has large amplitude which is pushed and squeezed by the India Plate,and is shortening and deforming rapidly,and the deformation tends is decreased from west to east and from south to north.In addition,the south Tianshan seismic belt absorbs the rate from the pressure toward north acted by Pamir Plateau by the rate of 5～10 mm a year.It is also discovered that there is strong shearing stress converging in the area of western Kashi in Xinjiang,where the crustal activity is extremely strong and complex.
引文
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[2]王晓强,李杰,AlexandrZubovich,王琪.利用GPS研究天山及邻近地区地壳水平位移与应变特征[J].地震学报,2007,29(1):31~37.
[3]王晓强,王琪,等.新疆伽师及邻近地区现今地壳形变的监测与研究[J].西北地震学报,2002,24(3),199~207.
[4]王琪,丁国瑜,乔学军,王晓强,游新兆.天山现今地壳快速缩短与南北地块的相对运动[J].科学通报,2000,40(14):1543~1547.
[5]杨马陵,苏乃秦.1997年伽师强震群及预报概况[J].内陆地震,1997,11(4):390~398.
[6]Freymuellet J..An automatic editing program for GPS dual-frequency codeless;GPS receiver,Introduction to GIPSY-OASIS-II[M].Jet Propulsion Laboratory,July,1993.255~269.
[7]郭良迁.对中国大陆地壳水平变形的初步探索[J].中国地震,2000,16(2):126~134.
[8]Qi Wang,Pei-Zhen Zhang,Jeffrey T,Freymueller,etal.Present-Day Crustal Deformation in China Constrainedby Global Positioning System Measurements[J].Science,2001,294:574~577.
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