Study of the Songyuan, Jilin, earthquake sequence in 2017−2018
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摘要: 本文利用主地震相对定位法,对2017年7月18日—2018年7月15日期间发生在2018年松原MS5.7地震震中附近的地震进行了重新定位,并对松原地震序列进行了分析,得到如下结果:① 松原地震破裂面的走向为SW向,倾角较陡,接近直立,倾向为NW向;② 研究区范围内的地震震源深度大部分比主震浅;③ 主震发生前的地震显示出震源深度逐渐加深的过程,主震发生后,地震的震源深度则逐渐变浅。根据上述结果,结合研究区的地震构造背景及松原地震震源机制解的综合分析结果表明,本次地震的破裂面走向为NE−SW向,其发震断层可能为一条NE−SW向的隐伏断层。Abstract: Using the master event relative location method, the earthquakes near the Songyuan MS5.7 earthquake occurred from 18 July 2017 to 15 July 2018 have been relocated. The Song-yuan earthquake sequence was analyzed. The results show that: ① The rupture plane for the Songyuan MS5.7 earthquake strikes south-west direction with deep angle and dips to north-west, nearly upright. ② Most of earthquakes are located above the main shock. There are very few earthquakes with the focal depth greater than that of the main shock. ③ The focal depths of the earthquakes increase with time prior to the main shock and decrease with time after the main shock. According to the above results, combining with tectonic conditions and focal mechanisms, we can infer that the rupture surface of the Songyuan MS5.7 earthquake strikes NE−SW, and a blind fault with a strike of NE−SW could be the seismogenic fault.
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Keywords:
- Songyuan earthquake sequence /
- master event /
- relative location /
- rupture process
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图 1 松原MS5.7地震周边区域构造背景及用于重定位台站和MS≥5.0地震的分布
震源机制解引自USGS (2018). F1:第二松花江断裂;F2:扶余—肇东断裂;F3:孤店断裂;F4:查干花断裂;F5:大安断裂
Figure 1. The tectonic background as well as distribution of the stations used for relocation and the earthquakes with MS≥5.0 around the epicenter of the Songyuan MS5.7 earthquake
The focal mechanism solution shown in the figure is obtained from the result of USGS (2018). F1:The second Songhuajiang fault;F2:Fuyu-Zhaodong fault;F3:Gudian fault;F4:Chaganhua fault;F5:Da’an fault
图 3 2017年7月18日—2018年5月27日(蓝色圆圈)和2018年5月28日—2018年7月14日(红色圆圈)松原MS5.7地震序列重新定位前 (左)、后 (右) ML≥2.0 (a)和ML≥3.3 (b)地震震中分布
Figure 3. The distribution of the epicenters of the Songyuan MS5.7 earthquake sequence before (left) and after (right) relocation which occurred from 18 July 2017 to 27 May 2018 (blue circles) and those occurred from 28 May 2018 to 14 July 2018 (red circles) with ML≥2.0 (a) and ML≥3.3 (b)
表 1 ML≥2.0地震震相数、定位误差与震源深度
Table 1 Number of seismic phases,location error and focal depth for ML≥2.0 earthquakes
序号 发震日期 ML 台站数 震相数 定位误差 震源深度
/km残差均方根
/sPn Pg Sg 纬度/km 经度/km 深度/km 1 2018−07−14 2.3 6 1 6 6 0.323 0.218 0.417 2 2018−07−11 2.5 5 1 5 5 0.440 0.614 0.225 3 2018−07−10 2.7 13 1 13 13 0.161 0.128 0.173 4 2018−07−10 2.7 12 2 12 12 0.148 0.112 0.231 5 2018−07−08 2.0 4 0 4 4 0.152 0.113 0.265 6 2018−07−06 2.6 10 0 10 10 0.153 0.115 0.265 7 2018−06−28 2.2 10 1 10 10 0.123 0.108 0.238 8 2018−06−21 2.5 8 0 8 8 0.129 0.099 0.273 9 2018−06−21 2.6 12 2 12 12 0.118 0.099 0.255 10 2018−06−17 3.0 13 5 13 13 0.081 0.064 1.191 2.9 0.146 11 2018−06−15 2.2 9 2 9 9 0.083 0.064 0.147 12 2018−06−12 2.5 10 2 10 10 0.078 0.065 0.117 13 2018−06−12 2.6 12 5 12 12 0.083 0.060 0.453 6.4 0.125 14 2018−06−05 3.4 23 14 23 23 0.054 0.049 2.276 4.6 0.115 15 2018−06−04 3.2 19 9 19 19 0.053 0.045 1.557 4.2 0.111 16 2018−0−603 2.7 15 2 15 15 0.054 0.046 0.127 17 2018−06−01 2.5 8 1 8 8 0.054 0.045 0.181 18 2018−05−31 3.7 18 11 18 18 0.053 0.047 2.779 6.3 0.195 19 2018−05−31 4.1 22 16 22 22 0.051 0.050 3.161 7.6 0.173 20 2018−05−31 2.1 4 0 4 4 0.052 0.050 0.209 21 2018−05−30 2.2 8 0 8 8 0.052 0.050 0.303 22 2018−05−30 2.2 6 0 6 6 0.052 0.049 0.172 23 2018−05−30 2.0 5 0 5 5 0.052 0.049 0.084 24 2018−05−29 2.2 4 0 4 4 0.052 0.050 0.213 25 2018−05−29 2.5 6 0 6 6 0.052 0.049 0.396 26 2018−05−29 2.4 10 3 10 10 0.052 0.049 4.462 6.5 0.169 27 2018−05−29 2.7 13 4 13 13 0.051 0.048 2.021 5.0 0.173 28 2018−05−29 2.6 6 1 6 6 0.052 0.048 0.260 29 2018−05−29 2.2 5 0 5 5 0.052 0.048 0.217 30 2018−05−29 4.2 18 11 18 18 0.051 0.044 2.199 6.0 0.136 31 2018−05−29 2.1 7 0 7 7 0.051 0.044 0.333 32 2018−05−29 2.6 17 5 17 17 0.049 0.045 2.923 5.5 0.157 33 2018−05−29 2.4 10 3 10 10 0.049 0.045 0.002 9.1 0.131 34 2018−05−28 3.3 21 16 21 21 0.051 0.046 2.982 7.3 0.145 35 2018−05−28 2.5 11 0 11 11 0.052 0.047 0.157 36 2018−05−28 2.2 10 1 10 10 0.053 0.046 0.146 37 2018−05−28 2.6 15 0 15 15 0.052 0.044 0.120 38 2018−05−28 2.3 10 0 10 10 0.052 0.044 0.253 39 2018−05−28 2.3 11 2 11 11 0.054 0.047 0.215 40 2018−05−28 2.1 7 0 7 7 0.054 0.046 0.330 41 2018−05−28 2.0 9 0 9 9 0.054 0.045 0.185 42 2018−05−28 2.4 12 0 12 12 0.052 0.045 0.229 43 2018−05−09 2.5 8 1 8 8 0.054 0.048 0.164 44 2018−04−23 4.0 21 14 21 21 0.056 0.048 3.812 8.1 0.133 45 2018−04−20 2.0 6 0 6 6 0.058 0.047 0.384 -
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