Tectonic stress field analysis on the source region of the 2015 MW8.3 Chile earthquake
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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.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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图 1 本文所用震源机制解的分布(a)与反演所得到的应力场方向(b)
震源机制解和反演的应力轴方向均采用下半球等面积投影表示.黑色十字表示σ1, σ2, σ3的的最优应力轴方向, 其周围的红点、绿点和蓝点给出了95%置信度下对应轴的置信范围
Figure 1. Distribution of the focal mechanism solutions (a) and the stress field orientation inverted in this study (b)
The focal mechanism data and stress direction are presented by lower-hemisphere equal-area projection. The black crosses show the optimal stress directions of σ1, σ2, σ3, and the red, green and blue points around them show the confidence range of the corresponding stress axes with confidence level of 95%
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图 2 主压应力σ1轴方位(a)以及主张应力σ3轴方位和应力形因子R值(b)分布图
黑色箭头表示划分网格反演结果, 红色箭头表示平均应力场结果；虚线表示板块边界
Figure 2. The distribution of the azimuth of σ1(a) and σ3 axes and the R value (b)
The black arrows represent the compressive and extensional axes of the stress field in subarea, and the red ones represent the compressive and extensional axes of the mean stress field. The dotted line presents the plate boundary
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