地震学报2012，Vol.34Issue(4)：439-450,12.DOI:10.3969/j.issn.0253-3782.2012.04.002
中国西部及邻区活动地块边界带现代构造应力场
Contemporary tectonic stress field on boundaries of active tectonic blocks in and around western China
摘要
Abstract
Contemporary tectonic stress field on boundaries of active tectonic blocks in and around western China mainland is obtained from the data of Harvard CMT solution and reliable focal mechanism solutions from 1920 to 1999 selected by Xu Zhonghuai. We obtained the stress field by testing input and checking FMSI code(Gephart) many times. Most of the maximum principal stress σ1 axes on active tectonic boundaries are horizontal. To the west of 90°E in and around western China mainland, the horizontal σ1 axes are nearly in N-S direction. In the northeastern area of Qingzang plateau, the horizontal σ1 axes are nearly NE—SW. In the southeastern area of Qingzang plateau, the horizontal o1 axes turn around clockwise around eastern end of Himalaya arc. The minimum principal stress σ3 axes show two dominant dip angles. In Xiyu active tectonic block region and on some segments of the northeastern edge of Qingzang plateau, the σ3 axes are steep, while in the Qingzang block region the σ3 axes are horizontal. So there are more thrust earthquakes in the Xiyu block region and on some segments of the northeastern edge of Qingzang plateau than in the Qingzang plateau block region. The stress field on the same active tectonic boundary is heterogeneous. On north Tianshan belt, south Tianshan belt, west Qinling-Delingha belt, Minshan-Longmenshan belt and Anninghe-Xiaojiang belt, the heterogeneity is relatively weak. On west Kunlun belt, Haiyuan-Qilian belt, east Kunlun belt, Mani-Yushu belt, Lancangjiang belt and western belt of west Yunnan block, the heterogeneity is relatively strong. The heterogeneity on Kalakunlun-Jiali belt and Himalaya belt is more notable. Due to limited focal mechanism data, this paper only gave the stress field on some segments of the active tectonic block boundaries. solution关键词
活动地块边界带/构造应力场/震源机制解Key words
active tectonic block boundary/ tectonic stress/ focal mechanism分类
天文与地球科学引用本文复制引用
郝平,吕晓健,田勤俭,傅征祥,陈丹..中国西部及邻区活动地块边界带现代构造应力场[J].地震学报,2012,34(4):439-450,12.基金项目
国家重点基础研究发展计划专题(2008CB425703)和国家科技支撑计划课题子专题(2008BAC44B02)资助. （2008CB425703）
