| 漾濞M6.4地震序列M≥5.0地震震源机制解及构造特征 |
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| 引用本文： | 李 见,陈 佳,金明培,李孝宾,黄 雅,高 琼.漾濞M6.4地震序列M≥5.0地震震源机制解及构造特征[J].大地测量与地球动力学,2022,42(7):680-686. |
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| 作者姓名： | 李 见 陈 佳 金明培 李孝宾 黄 雅 高 琼 |
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| 摘 要： | 基于滇西北密集台阵资料，采用绝对定位结合相对定位方法，对漾濞M6.4地震的前-主-余震进行重定位。同时，利用CAP全波形反演震源机制方法，获得此次地震序列中M≥5.0地震的震源机制解和矩心深度，并结合地震序列精定位结果对漾濞地震进行分析。结果表明，漾濞地震序列呈NW向展布，长约25~30 km，宽约5 km，主震在整个序列空间北端，且北部余震较集中。漾濞M6.4主震矩震级为MW6.03，矩心深度5.8 km，节面Ⅱ走向133°、倾角75°、滑动角-164°，与序列空间展布方向一致，为NW-SE向。M≥5.0地震震源机制和地震震源深度剖面皆表现为高倾角，且从北西到南东有变缓趋势，M6.4地震具有东南侧单侧破裂特征，节面Ⅱ为发震断层面。漾濞M6.4地震为一次NW向高倾角右旋走滑型地震，发震构造为维西-乔后-巍山断裂带西侧一条NW向的隐伏断裂或次生断裂，该断裂可能与维西-乔后断裂带不完全平行，存在一定夹角。
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| 关 键 词： | 漾濞M6.4地震 震源机制 重定位 发震构造 |
Focal Mechanism Solutions and Structural Characteristics of M≥5.0 in the Yangbi M6.4 Earthquake Sequence |
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| LI Jian,CHEN Jia,JIN Mingpei,LI Xiaobin,HUANG Ya,GAO Qiong.Focal Mechanism Solutions and Structural Characteristics of M≥5.0 in the Yangbi M6.4 Earthquake Sequence[J].Journal of Geodesy and Geodynamics,2022,42(7):680-686. |
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| Authors: | LI Jian CHEN Jia JIN Mingpei LI Xiaobin HUANG Ya GAO Qiong |
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| Abstract: | Based on dense array data in northwest Yunnan, using absolute positioning combined with the relative positioning method, we relocate the foreshocks, main shock, and aftershocks of the Yangbi M6.4 earthquake sequence. Simultaneously, we use the CAP full waveform inversion method to obtain the focal mechanism solution and centroid depth of M≥5.0 earthquakes. Combined with the accurate positioning results of the earthquake sequence, we analyze the Yangbi M6.4 earthquake. The results show that the Yangbi earthquake sequence presents a NW distribution with a length of 25~30 km and a width of about 5 km. The main shock is at the northern end of the whole sequence, and aftershocks are concentrated in the north. The moment magnitude of Yangbi M6.4 main shock is MW6.03, the centroid depth is 5.8 km, and the strike, dip, slip angle of the nodal plane Ⅱ is 133°, 75°, -164°, respectively, which is consistent with the NW-SE direction of earthquake sequence. Both the focal mechanism solution and focal depth profile of M≥5.0 earthquakes show high dip angles, and there is a slowing trend from northwest to southeast. The M6.4 earthquake has the characteristics of unilateral rupture on the southeast side, and the nodal plane Ⅱ is the seismogenic fault plane. The Yangbi M6.4 earthquake is a right-lateral strike-slip earthquake with NW-trending high-dip. Its seismogenic structure is a northwest-trending hidden fault or a secondary fault on the west side of the Weixi-Qiaohou-Weishan fault zone. The fault may not be completely parallel to the Weixi-Qiaohou fault zone, and there is a certain angle. |
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| Keywords: | Yangbi M6 4 earthquake focal mechanism relocation seismogenic structure |
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