Determination of focal mechanism and seismic energy of Luding MS6.8 earthquake on September 5，2022
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关键词:
- 2022年9月5日泸定MS6.8地震 /
- 震源机制 /
- 地震辐射能量
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图 1 2022年泸定MS6.8地震的矩张量
红色圆点为1 700年以来的8次M≥7地震，蓝色三角形为本文测定震源机制所使用的台站
Figure 1. Moment tensor of the 2022 Luding MS6.8 earthquake
Red dots are the location of eight M≥7 earthquakes in the past 1 700 years，blue triangles are the location of the stations used in the determination of focal mechanism in this paper
图 2 泸定MS6.8地震震源区的一维速度模型（数据来自于Xin et al，2019）
Figure 2. One-dimensional velocity model of source area of Luding MS6.8 earthquake （data from Xin et al，2019）
图 3 震源矩心深度拟合结果
红色圆点为（拟合度）值，蓝色圆点为矩震级MW
Figure 3. The fitting result of focal centroid depth
The red dot is the fitting degree，and the blue dot is the moment magnitude MW
图 4 泸定MS6.8地震最佳拟合矩心深度为9.0 km时的波形拟合
Δ为震中距，θ为方位角，TS为时延＋20 s，VR为理论波形（红色）与实际波形（黑色）的拟合度
Figure 4. Waveform fitting with the best fitting centroid depth of 9.0 km for the Luding MS6.8 earthquake
Δ is the epicentral distance，θ is the azimuth angle，TS is the time delay plus 20 s，and VR is a parameter describing the fitting degree of the theoretical waveform （red） and the actual waveform （black）
图 6 单台能量震级及其平均值偏差（a）和残差分布（b）
Figure 6. Single station energy magnitude and its average deviation （a） and residual distribution （b）
表 1 不同机构和作者给出的泸定地震震源机制解及最小空间旋转角
Table 1. Focal mechanism solution and minimum spatial rotation angle of Luding earthquake given by different organizations and authors
序号 机构或作者 震源机制解 本文结果与相应结果的
最小空间旋转角/°走向/° 倾角/° 滑动角/° 1 USGS 159 82 −4 14.5 2 GCMT 163 80 8 9.2 3 GFZ 164 85 6 4.5 4 IPGP 163 71 −3 19.8 5 四川地震台 172 74 27 24.2 6 中国地震台网中心 343 79 9 21.3 7 王卫民 166 75 0 14.7 8 郭祥云 335 74 −15 22.6 9 韩立波和蒋长胜 343 89 −34 17.8 注：USGS：美国地质调查局；GCMT：美国哥伦比亚大学全球矩心矩张量解中心；GFZ：亥姆霍兹波茨坦中心；IPGP：法国巴黎
地球物理学院。表中震源机制数据引自防灾科技学院河北省地震动力学重点实验室Seismology小组（2022）。
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表 2 2013年4月20日芦山MS7.0地震与2022年9月5日泸定MS6.8地震的地震参数对比
Table 2. Comparison of seismic parameters between the Lushan MS7.0 earthquake on April 20，2013 and the Luding MS6.8 earthquake on September 5，2022
发震时间 发震地点 MS MW 地震辐射能量ER/（1014 J） 高频地震辐射能量ERH/（1014 J） 2013-04-20 四川芦山 7.0 6.6 4.3 4.8 2022-09-05 四川泸定 6.8 6.7 4.1 5.5
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