大地测量与地球动力学2013，Vol.33Issue(4)：13-16,4.
汶川Ms8.0地震后川滇地区地壳水平形变特征研究
CRUSTAL DEFORMATION CHARACTERISTICS AFTER Ms8.0 WENCHUAN EARTHQUAKE IN SICHUAN-YUNNAN REGION
摘要
Abstract
The velocity field of the 296 stations in the Sichuan-Yunnan region has been obtained with the GPS observation data of the CMONOC from 2009 to 2011.Based on the continuous deformation hypothesis,we use the data of the horizontal velocity field to compute the distribution of horizontal strain field in this region by the triangle method.Preliminary analysis indicates that:1) In Sichuan-Yunnan region,the crustal movement of north and west is stronger than that of south and east.The Sichuan-Yunnan rhombic block is characterized by clockwise rotation.2) The directions of the principal compressive strain axis and the P axis of the focal mechanism solution show that tectonic stress field in this region is relatively stable in a long term.3) The high value areas of the principal strain and the maximum shear strain rate are in the Longmenshan fault zone and its surrounding region.In addition to the above areas,the significant high-value properties of the maximum shear strain rate can be seen in the south of the Xianshuihe fault zone and the northwest segment of the Red River fault zone.关键词
川滇地区/应变率场/GPS/三角形法/地壳形变Key words
Sichuan-Yunnan region / strain rate field / GPS / triangle method / crustal deformation分类
天文与地球科学引用本文复制引用
党学会,乔学军,赵斌,吕健,王恒信,张昀龙..汶川Ms8.0地震后川滇地区地壳水平形变特征研究[J].大地测量与地球动力学,2013,33(4):13-16,4.基金项目
中国地震局地震行业科研专项(201208009) （201208009）
国家自然科学基金(41274027,41274037) （41274027,41274037）
