地震学报2011，Vol.33Issue(2)：262-267,6.DOI:10.3969/j.issn.0253-3782.2011.02.013
2011年云南盈江Ms5.8地震及其余震序列重定位
Relocation of mainshock and aftershocks of the 2011 Yingjiang Ms5.8 earthquake in Yunnan
摘要
Abstract
Based on the 3-D travel-time tables and 3-D velocity model of Sichuan -Yunnan region, we relocated the Yingjiang Ms5. 8 earthquake occurred in Yunnan Province on March 10, 2011, by using the simplex algorithm. The relocated mainshock is 97. 901°E, 24. 677°N, and the focal depth is 13.1 km. Aftershocks were relocated by applying the double-difference method. The aftershocks show obviously spatial and temporal variation, and mainly distribute along the two sides of Dayingjiang fault and near the junction of the middle and northeast section of Dayingjiang fault. The length of the aftershock zone is about 12 km. Aftershocks were moving from southwest to northeast along the northeast segment of Dayingjiang fault, while near the junction between the middle and northeast segment of Dayingjiang fault aftershocks were moving to the middle segment of Dayingjiang fault gradually. The focal depths of aftershocks tend to migrate to the surface. The minimum depth of aftershocks in the first 10 hours approached to 2 km, indicating that the rupture is close to the surface. Combined with the relocation result, we analyzed the factors causing damage to buildings. The main reasons for the destruction of buildings include that the epicenter is located in the basin, the focal depth is shallow, and the epicenter distance is short to Yingjiang city.关键词
盈江地震/大盈江断裂/余震序列/双差地震定位Key words
Yingjiang earthquake/ Dayingjiang fault/ aftershock sequences/double-difference relocation分类
天文与地球科学引用本文复制引用
房立华,吴建平,张天中,黄静,王长在,杨婷..2011年云南盈江Ms5.8地震及其余震序列重定位[J].地震学报,2011,33(2):262-267,6.基金项目
地震行业专项(200808001,201108014)资助.中国地震局地球物理研究所论著11AC1006. （200808001,201108014）
