| 2015年智利MW8.3地震震源区构造应力场分析 |
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| 引用本文： | 李祥,万永革,崔华伟,黄骥超,闫睿,高熹微.2015年智利MW8.3地震震源区构造应力场分析[J].地震学报,2016,38(6):847-853. |
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| 作者姓名： | 李祥 万永革 崔华伟 黄骥超 闫睿 高熹微 |
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| 作者单位： | 中国河北三河 065201 防灾科技学院 |
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| 基金项目： | 国家自然科学基金41674055“晋冀蒙交界区临时测震台网建设运行及强震背景跟踪研究”项目DZ20150428102河北省地震科技星火计划DZ20140101002河北省地震科技星火计划(DZ20140101002)、国家自然科学基金(41674055)和“晋冀蒙交界区临时测震台网建设运行及强震背景跟踪研究”项目(DZ20150428102)共同资助 |
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| 摘 要： | 自GCMT目录收集2015年9月16日智利MW8.3地震震中周围深度在70 km以上的震源机制解, 应用MSATSI软件反演了该地震震中周围的应力场.反演结果显示, 主压应力轴方向的整体一致性较好, 张轴的非均匀性明显, 即大致以31.5°S为界, 南部处于EW向和NS向的双轴压缩状态, 以WE向挤压为主, 兼有NS向挤压, 拉张轴近乎垂直；北部压轴方位仍为近EW向, 但张轴方位旋转至近NS向.
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| 关 键 词： | 震源机制解 反演 非均匀应力场 智利地震 俯冲带 |
| 收稿时间： | 2016-01-11 |
Tectonic stress field analysis on the source region of the 2015 MW8.3 Chile earthquake |
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| Institution: | Institute of Disaster Prevention, Hebei Sanhe 065201, China |
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| Abstract: | Based on the focal mechanism solutions above depth of 70 km around the MW8.3 Chile earthquake on 16 September 2015 collected from GCMT, this paper carries out the inversion for stress field of the source region by using MSATSI software. The inversion results show that the directions of all compressive stress axes are consistent to each other, but extensional stress axes exhibit strong inhomogeneity. Taking the 31.5°S as boundary, the south part is under approximately biaxial compression with major compression in E-W direction and minor compression in N-S direction, but extensional in U-D direction. Whereas in north part, the compressive axis is still in E-W direction, but the extensional stress axis gradually rotates to N-S direction. |
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