2017—2018年吉林松原地震序列研究

李艳娥, 邢成起, 陈丽娟, 郭祥云, 康建红

李艳娥, 邢成起, 陈丽娟, 郭祥云, 康建红. 2019: 2017—2018年吉林松原地震序列研究. 地震学报, 41(4): 435-444. DOI: 10.11939/jass.20180121
引用本文: 李艳娥, 邢成起, 陈丽娟, 郭祥云, 康建红. 2019: 2017—2018年吉林松原地震序列研究. 地震学报, 41(4): 435-444. DOI: 10.11939/jass.20180121
Li Yan’e, Xing Chengqi, Chen Lijuan, Guo Xiangyun, Kang Jianhong. 2019: Study of the Songyuan, Jilin, earthquake sequence in 2017−2018. Acta Seismologica Sinica, 41(4): 435-444. DOI: 10.11939/jass.20180121
Citation: Li Yan’e, Xing Chengqi, Chen Lijuan, Guo Xiangyun, Kang Jianhong. 2019: Study of the Songyuan, Jilin, earthquake sequence in 2017−2018. Acta Seismologica Sinica, 41(4): 435-444. DOI: 10.11939/jass.20180121

2017—2018年吉林松原地震序列研究

基金项目: 国家重点研发计划(2018YFC1503405)资助
详细信息
    通讯作者:

    邢成起: e-mail:xingcq@bj.seis.gov.cn

  • 中图分类号: P315.3

Study of the Songyuan, Jilin, earthquake sequence in 2017−2018

  • 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.
  • 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  2   松原MS5.7地震序列重新定位地震的M-t

    Figure  2.   The M-t diagram of the relocated earthquakes of the Songyuan MS5.7 earthquake sequence

    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)

    图  4   ML≥2.0地震频次空间扫描结果

    Figure  4.   The spatial distribution of the seismic frequency of ML≥2.0 earthquakes

    图  5   松原MS5.7地震序列重新定位前沿截面AA1方向(a)和垂直于AA1方向(b)的震源深度剖面图

    Figure  5.   Focal depth profiles of the Songyuan MS5.7 earthquake sequence before relocation along the direction of the section AA1 (a) and that perpendicular to the section AA1 (b)

    图  6   松原MS5.7地震序列重新定位后沿截面AA1方向(a)和垂直于AA1方向(b)的震源深度剖面图

    Figure  6.   Focal depth profiles of the relocated earthquakes of the Songyuan MS5.7 earthquake sequence along the direction of the section AA1 (a) and that perpendicular to the section AA1 (b)

    图  7   松原MS5.7地震序列重新定位后震源深度随地震序号的变化

    Figure  7.   Focal depth versus number of relocated earthquakes of the Songyuan MS5.7 earthquake sequence

    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
    /s
    PnPgSg纬度/km经度/km深度/km
    12018−07−142.3 6 1 6 60.3230.2180.417
    22018−07−112.5 5 1 5 50.4400.6140.225
    32018−07−102.713 113130.1610.1280.173
    42018−07−102.712 212120.1480.1120.231
    52018−07−082.0 4 0 4 40.1520.1130.265
    62018−07−062.610 010100.1530.1150.265
    72018−06−282.210 110100.1230.1080.238
    82018−06−212.5 8 0 8 80.1290.0990.273
    92018−06−212.612 212120.1180.0990.255
    102018−06−173.013 513130.0810.0641.1912.90.146
    112018−06−152.2 9 2 9 90.0830.0640.147
    122018−06−122.510 210100.0780.0650.117
    132018−06−122.612 512120.0830.0600.4536.40.125
    142018−06−053.4231423230.0540.0492.2764.60.115
    152018−06−043.219 919190.0530.0451.5574.20.111
    162018−0−6032.715 215150.0540.0460.127
    172018−06−012.5 8 1 8 80.0540.0450.181
    182018−05−313.7181118180.0530.0472.7796.30.195
    192018−05−314.1221622220.0510.0503.1617.60.173
    202018−05−312.1 4 0 4 40.0520.0500.209
    212018−05−302.2 8 0 8 80.0520.0500.303
    222018−05−302.2 6 0 6 60.0520.0490.172
    232018−05−302.0 5 0 5 50.0520.0490.084
    242018−05−292.2 4 0 4 40.0520.0500.213
    252018−05−292.5 6 0 6 60.0520.0490.396
    262018−05−292.410 310100.0520.0494.4626.50.169
    272018−05−292.713 413130.0510.0482.0215.00.173
    282018−05−292.6 6 1 6 60.0520.0480.260
    292018−05−292.2 5 0 5 50.0520.0480.217
    302018−05−294.2181118180.0510.0442.1996.00.136
    312018−05−292.1 7 0 7 70.0510.0440.333
    322018−05−292.617 517170.0490.0452.9235.50.157
    332018−05−292.410 310100.0490.0450.0029.10.131
    342018−05−283.3211621210.0510.0462.9827.30.145
    352018−05−282.511 011110.0520.0470.157
    362018−05−282.210 110100.0530.0460.146
    372018−05−282.615 015150.0520.0440.120
    382018−05−282.310 010100.0520.0440.253
    392018−05−282.311 211110.0540.0470.215
    402018−05−282.1 7 0 7 70.0540.0460.330
    412018−05−282.0 9 0 9 90.0540.0450.185
    422018−05−282.412 012120.0520.0450.229
    432018−05−092.5 8 1 8 80.0540.0480.164
    442018−04−234.0211421210.0560.0483.8128.10.133
    452018−04−202.0 6 0 6 60.0580.0470.384
    下载: 导出CSV

    表  2   松原MS5.7地震的断层面参数

    Table  2   Nodal plane parameters for the Songyuan MS5.7 main shock

    来源节面Ⅰ节面Ⅱ
    走向/°倾角/°滑动角/°走向/°倾角/°滑动角/°
     中国地震局地球物理研究所21686172307824
     中国地震局地震预测所(李君等,2019220791623147212
     中国地震台网中心(杨文等,201821887−14912659−4
     美国地质调查局(USGS,20184768−16931380−22
    下载: 导出CSV
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出版历程
  • 收稿日期:  2018-11-18
  • 修回日期:  2019-03-05
  • 网络出版日期:  2019-07-02
  • 发布日期:  2019-06-30

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