李永生,赵谊,李继业,高峰,石伟. 2020. 2018年5月28日吉林松原 M S5.7地震发震构造分析. 地震学报,42(1):12−23. doi:10.11939/jass.20190095. doi: 10.11939/jass.20190095
引用本文: 李永生,赵谊,李继业,高峰,石伟. 2020. 2018年5月28日吉林松原 M S5.7地震发震构造分析. 地震学报,42(1):12−23. doi:10.11939/jass.20190095. doi: 10.11939/jass.20190095
Li Y S,Zhao Y,Li J Y,Gao F,Shi W. 2020. Seismogenic structure analysis of the M S5.7 Songyuan,Jilin,earthquake on May 28,2018. Acta Seismologica Sinica42(1):12−23. doi:10.11939/jass.20190095. doi: 10.11939/jass.20190095
Citation: Li Y S,Zhao Y,Li J Y,Gao F,Shi W. 2020. Seismogenic structure analysis of the M S5.7 Songyuan,Jilin,earthquake on May 28,2018. Acta Seismologica Sinica42(1):12−23. doi:10.11939/jass.20190095. doi: 10.11939/jass.20190095

2018年5月28日吉林松原MS5.7地震发震构造分析

Seismogenic structure analysis of the MS5.7 Songyuan,Jilin,earthquake on May 28,2018

  • 摘要: 利用黑龙江、吉林、内蒙古三省数字地震台网的三分量宽频带波形资料对2018年5月28日吉林省松原市宁江区发生的MS5.7地震进行了全波形矩张量反演,获取了此次地震的震源机制解和矩心位置;并使用震源-矩心方法讨论了该地震的发震断层。研究结果显示:松原MS5.7地震的矩震级为MW5.2,矩心位置为(45.225°N,124.685°E),矩心深度为7 km。震源机制解参数显示:该地震为走滑型;节面Ⅰ的走向、倾角和滑动角分别为217°,82°和164°;节面Ⅱ的走向、倾角和滑动角分别为309°,74°和8°;双力偶成分占96.4%,方差减少为93%。震源−矩心图显示震源更接近节面Ⅰ,与北东向的扶余—肇东断裂走向及倾角一致,因此,推测扶余—肇东断裂为发震断层。

     

    Abstract: Based on the three-component waveform data of regional broadband stations of Heilongjiang, Jilin and Inner Mongolia digital seismic networks, the full waveform moment tensor inversion for the MS5.7 earthquake occurred in Ningjiang district of Songyuan, Jilin Province, on May 28, 2018 is carried out, and the focal mechanism solution and centroid position of the earthquake are obtained. And then the hypocenter-centroid method is used to determine the actual seismogenic fault. The results show that the moment magnitude is MW5.2, centroid position is (45.225°N, 124.685°E), and centroid depth is 7 km. The mechanism parameters of the earthquake are: strike 217°, dip 82°, rake 164° for the nodal planeⅠ , strike 309°, dip 74°, rake 8° for the nodal planeⅡ , and the event is of strike-slip type. Moreover, double-couple component is 96.4%, and variance reduction is 93%. The hypocenter-centroid plot indicates that the hypocenter is close to nodal plane Ⅰ , which is consistent with the strike and dip angle of the Fuyu-Zhaodong fault. Therefore, it is indicated that the Fuyu-Zhaodong fault is the real fault plane.

     

/

返回文章
返回