2022年青海门源M6.9地震矩心矩张量解

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据中国地震台网中心测定,北京时间2022年1月8日01时45分,中国青海省海北州门源县发生了M6.9地震,震中位于( 37.77°N, 101.26°E),震源深度为10 km.这是2022年中国大陆第一个接近7级的强震.距离此次地震震中40 km以东,2016年曾发生过门源M6.4地震;且东北部在1927年还发生过甘肃古浪M8地震.
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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.