Determination the focal mechanism solutions of earthquakes with M≥4.0 occurred in the mainland of China in December 2021
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摘要: 为了填补测震台网地震震源参数目录常规数据产出方面的空白，本文利用中国地震台网记录的宽频带波形资料，采用近震全波形反演方法对2021年12月1—31日发生在中国大陆地区的M≥4.0共6次地震进行震源机制反演。结果显示逆断型3次，走滑型2次，未知型1次。Abstract: In order to fill a gap in the seismological products of the earthquake source parameters catalog of the seismic networks, focal mechanism solutions of the 6 earthquake events with M≥4.0 in the mainland of China from December 1 to December 31, 2021 were obtained using the regional full waveform inversion based on the broadband waveforms from China seismic network. The results show that these events include 3 reverse faulting, 2 strike-slip faulting and 1 unknown earthquakes.
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Key words:
- focal mechanism /
- source parameters
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图 1 6次M≥4.0以上地震震中位置和所用台站分布
Figure 1. Map of the epicenters of the 6 earthquake events with M≥4.0 and the distribution of used stations
图 2 本文所得震源机制解对应的三分量理论 （红色） 和实际 （黑色） 波形对比图。图中右测字符表示台站代码，波形上方数字为方差减少量值，代表波形拟合程度
Figure 2. Comparison of the three-component theoretical （red） and observational （black） waveforms corresponding to focal mechanism solutions obtained in this paper. The station codes are plotted on the right of the figure, the numbers above the waveforms are variance reduction which indicate the fitting degree of waveform
图 3 2021年12月中国大陆地区M≥4.0地震类型图解
Figure 3. The category diagram of the earthquakes in the mainland of China in December 2021
表 1 2021年12月中国大陆地区M≥4.0地震基本参数
Table 1. Events list of the earthquakes with M≥4.0 in the mainland of China in December 2021
序号 发震时刻（BJT）
（年-月-日 时:分:秒）北纬
/°东经
/°深度
/km震级（M） 参考地名 1 2021-12-01 05:39:33.8 28.34 104.97 9 4.2 四川宜宾市长宁县 2 2021-12-06 14:26:52.8 34.21 100.58 9 4.7 青海果洛州甘德县 3 2021-12-17 14:54:38.6 43.43 88.82 25 4.4 新疆乌鲁木齐市达坂城区 4 2021-12-19 07:54:28.8 38.95 92.73 10 5.3 青海海西州茫崖市 5 2021-12-22 21:46:16.8 31.76 120.00 10 4.2 江苏常州市天宁区 6 2021-12-30 05:30:22.9 36.92 94.67 10 4.9 青海海西州格尔木市 
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表 2 2021年12月中国大陆地区M≥4.0地震的震源机制结果
Table 2. Focal mechanism solutions of the earthquakes with M≥4.0 in the mainland of China in December 2021
序号 发震时刻（BJT）
（年-月-日 时:分:秒）节面Ⅰ 节面Ⅱ P轴 T轴 矩心
深度/km矩震级
（MW）VR CN 走向/° 倾角/° 滑动
角/°走向/° 倾角/° 滑动
角/°方位
角/°仰角/° 方位
角/°仰角/° 1 2021-12-01 05:39:33.8 137 50 75 340 42 107 238 4 348 78 5 4.3 0.75 2.4 2 2021-12-06 14:26:52.8 46 77 −171 314 81 −13 270 16 0 2 5 4.5 0.65 2.8 3 2021-12-17 14:54:38.6 82 73 111 209 26 40 156 26 19 57 24 4.2 0.79 1.9 4 2021-12-19 07:54:28.8 175 61 142 285 58 35 231 2 139 46 15 4.9 0.62 2.8 5 2021-12-22 21:46:16.8 212 71 170 305 80 19 77 6 170 20 13 4.1 0.74 2.4 6 2021-12-30 05:30:22.9 118 48 94 292 42 85 205 3 69 86 13 4.5 0.64 2.4
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