| 2022年青海门源MS6.9地震震源机制解 |
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| 作者姓名： | 韩立波 |
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| 作者单位： | 中国地震局地球物理研究所，北京100081 |
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| 摘 要： | 2022年1月8日，青海门源地区发生MS6.9地震，本文利用CAP方法反演了主震震源机制解和震源深度。结果显示，断层节面Ⅰ:走向191°/倾角62°/滑动角173°，节面Ⅱ:走向284°/倾角82°/滑动角21°。此次地震为走滑型地震，最佳矩心震源深度约3 km，矩震级为MW6.7。结合震源机制解和定位结果分析认为，节面Ⅱ可能为实际破裂面，本次地震发生在冷龙岭断裂和托莱山断裂的交汇部位，本次地震与2016年和1986年2次M6.4地震震源机制解不同，显示出该区域复杂的构造背景。
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| 关 键 词： | 门源地震 震源机制解 震源深度 |
| 收稿时间： | 2022-02-08 |
Focal mechanism of 2022 Menyuan MS6.9 earthquake in Qinghai Province |
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| Authors: | Han Libo |
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| Institution: | Institute of Geophysics，China Earthquake Administration，Beijing 100081, China |
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| Abstract: | On Jan. 8, 2022, a strong earthquake with surface magnitude up to MS6.9 occurred in Menyuan region, Qinghai Province. To understand its tectonic implication, focal mechanism and centroid depth of the major event are inverted by CAP method. The inversion results show that the event is dominated by a strike-slip focal mechanism with a very shallow centroid depth (3 km). Combining with the spatial orientations of relocated aftershocks, we confirm the rupture plane 284°/82°/21° (strike/dip/rake). The focal mechanism is different with those events including the 1986 and 2016 M6.4 Menyuan earthquakes, implying the complex crustal deformation in this region. The results provide fundamental information for seismic hazard in this region. |
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