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川滇地区活动地块现今地壳形变特征
引用本文:乔学军,王琪,杜瑞林.川滇地区活动地块现今地壳形变特征[J].地球物理学报,2004,47(5):805-811.
作者姓名:乔学军  王琪  杜瑞林
作者单位:中国地震局地震研究所GPS实验室, 武汉 430071 中国地震局地壳应力研究所,北京 100085
基金项目:国家自然科学基金 ( 4 0 3 0 40 0 2 ,40 0 740 2 4)资助
摘    要:利用川滇地区1998~2002年间200多GPS点位的多期复测结果, 将川滇地区分为9个次级活动块体, 计算了各个活动块体的欧拉旋转矢量和主要活动断裂的运动速度, 并分析了该地区的应变场特征. 结果表明, 川滇地区的地壳运动速度具有北强南弱、西强东弱、以菱形块体为主顺时针旋转的特征; 菱形块体外各个块体运动速度大幅衰减; 与地质结果的差异表明, 川滇菱形块体的现今地壳运动由北往南逐渐增强; 青藏高原物质的侧东向挤出在滇中块体南部明显下降, 而丽江—小金河断裂带的吸收作用并不明显; 川滇地区以压应变为主,四川石棉和云南新平一带出现的应变集中地区也许具有发生中强地震的可能性.

关 键 词:川滇  活动块体  GPS  地壳形变  
文章编号:0001-5733(2004)05-0805-07
收稿时间:2003-6-10
修稿时间:2004-5-11

CHARACTERISTICS OF CURRENT CRUSTAL DEFORMATION OF ACTIVE BLOCKS IN THE SICHUAN-YUNNAN REGION
QIAO Xue-Jun,WANG Qi,DU Rui-LinGPS Laboratory.CHARACTERISTICS OF CURRENT CRUSTAL DEFORMATION OF ACTIVE BLOCKS IN THE SICHUAN-YUNNAN REGION[J].Chinese Journal of Geophysics,2004,47(5):805-811.
Authors:QIAO Xue-Jun  WANG Qi  DU Rui-LinGPS Laboratory
Institution:GPS Laboratory, Institute of Seismology, China Earthquake Administration, Wuhan 430071,China Institute of Crustal Dynamics, China Earthquake Administration, Beijing 100085, China
Abstract:The Sichuan Yunnan area are divided into nine active secondary crustal blocks based on several GPS repeat surveys at more than 200 GPS sites during 1998~2002. The Euler rotation vectors of nine secondary blocks, the velocities of main faults and strain field of the area are calculated and analyzed. The results indicate that the crustal movement of the area in north and west are stronger than that of south and east. The Sichuan Yunnan rhombic block is characterized by clockwise rotation. The velocities of those blocks outside the rhombic block decrease swiftly. Different rates derived from GPS and geology data show that the current crustal motions become stronger from north to south within the rhombic block. The eastward extrusion of the Qinghai Xizang plateau presents a marked drop in the middle Yunnan block and the absorption effect of the Lijiang Xiaojinhe fault is invisible. The Sichuan Yunan area is dominated by compressive strain. The strain concentration at Shimian of Sichuan province and Xinping of Yunnan province implies a possible moderate or major seismic risk.
Keywords:Sichuan-Yunnan  Active block  GPS  Crustal deformation  
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