长宁—兴文地区应力降等震源参数与区域内显著地震的时空关系

何鑫俊 张晓东 孟令媛 王月

何鑫俊,张晓东,孟令媛,王月. 2023. 长宁—兴文地区应力降等震源参数与区域内显著地震的时空关系. 地震学报,45(2):1−14 doi: 10.11939/jass.20210196
引用本文: 何鑫俊,张晓东,孟令媛,王月. 2023. 长宁—兴文地区应力降等震源参数与区域内显著地震的时空关系. 地震学报,45(2):1−14 doi: 10.11939/jass.20210196
He X J,Zhang X D,Meng L Y,Wang Y. 2023. Spatio-temporal relationship between source parameters such as stress drop and significant earthquakes in Changning-Xingwen area. Acta Seismologica Sinica,45(2):1−14 doi: 10.11939/jass.20210196
Citation: He X J,Zhang X D,Meng L Y,Wang Y. 2023. Spatio-temporal relationship between source parameters such as stress drop and significant earthquakes in Changning-Xingwen area. Acta Seismologica Sinica45(2):1−14 doi: 10.11939/jass.20210196

长宁—兴文地区应力降等震源参数与区域内显著地震的时空关系

doi: 10.11939/jass.20210196
基金项目: 国家自然科学基金项目(41974068)中国地震科学实验场的地震可预测性国际合作研究(2018YFE0109700)共同资助
详细信息
    作者简介:

    何鑫俊,在读硕士研究生,主要从事数字地震学研究,e-mail:hxj_828@126.com

    通讯作者:

    张晓东,博士,研究员,主要从事地震活动性和地震预测研究,e-mail:zxd@ief.ac.cn

  • 中图分类号: P315.72

Spatio-temporal relationship between source parameters such as stress drop and significant earthquakes in Changning-Xingwen area

  • 摘要: 基于中国地震台网提供的震相观测报告,利用双差方法对长宁—兴文地区2019—2020年1 948个ML≥2.0地震事件进行了重定位,重定位后的1 823个ML≥2.0地震事件分布显示长宁—兴文地区北区地震序列沿NW—SE方向背斜展布,而南区地震分布较分散。计算了四川长宁—兴文地区2019年6月17日至2020年12月31日208个ML≥3.0地震的地震矩和应力降等震源参数,分析了2019年6月17日长宁MS6.0地震后研究区内地震应力降的演化特征,结果显示长宁—兴文地区中强地震发生前ML3.0—3.9地震的应力降显著升高,且ML≥4.0地震多发生在ML3.0—3.9地震的应力降高值区。

     

  • 图  1  双差定位中使用的台站、主要活动断层及研究区地震分布

    Figure  1.  Distribution of the stations used in double difference positioning,active faults and earthquakes in the studied area

    图  2  相对定位前震源距-到时曲线及震相数据筛选

    Figure  2.  Focal distance versus travel time curves before relative location and seismic phase data screening

    图  3  重定位后的震中分布

    (a) 重定位震中分布;(b,c) 重定位后沿经度、纬度方向深度分布;(d) 重定位后深度分布统计

    Figure  3.  Distribution of relocated earthquake events

    (a) Relocation of epicenter distribution;(b,c) The depth distribution along longitude and latitude,respectively;(d) Statistics of depth distribution after relocation

    图  4  拐角频率拟合过程示例

    L1表示用上述方法求得的Ω0fc代入式(4)得到的频谱曲线,L2为实际观测频谱曲线

    Figure  4.  The example of corner frequency fitting process

    L1 represents the spectrum curve obtained by substituting Ω0 and fc obtained by the above method into Equation (4),and L2 is the observation spectrum curve

    图  5  研究区震源参数与震级ML的关系

    Δσ为应力降,fc为拐角频率,M0为地震矩,r为震源半径,ML为震级,R为相关系数,下同

    Figure  5.  The relationship between source parameters and magnitude ML in the studied area

    Δσ is stress drop,fc is corner frequency,M0 is seismic moment,r is source radius,ML is magnitude,R is correlation coefficient,the same below

    图  6  北区(a,b)、南区(c,d)震源参数地震矩M0、震源半径Y与震级的关系

    Figure  6.  The relationship between source parameters seismic moment M0,source radius r and ML in the northern region (a,b) and southern region (c,d)

    图  7  应力降∆σ随时间(a)和震级ML(b)的变化

    Figure  7.  Variation of the stress drop ∆σ with time (a) and magnitude ML (b)

    图  8  (a) 北区和南区ML3.0—3.9应力降随时间变化及强余震;(b) 2019年10月至2020年12月高应力降地震及其强余震的空间分布

    Figure  8.  (a) Stress drop changes of ML3.0—3.9 earthquakes and strong aftershocks with time in the northern region and the southern region;(b) Spatial distribution of high stress drop earthquakes and strong aftershocks from October 2019 to December 2020

    图  9  ML3.0—3.9应力降网格均值分布(网格大小0.05°×0.05°)

    黑点表示本文用于计算应力降均值的地震,空心圆圈表示2019年6月17日至2020年12月31日期间长宁地区ML4.0以上地震

    Figure  9.  Mean grid distribution of stress drop of ML3.0—3.9 (grid size 0.05°×0.05°) distribution Black dots denote the earthquakes used for calculating mean stress drop,white circles denote the earthquakes above ML4.0 in Changning area from 17 June 2019 to 31 December 2020

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  • 收稿日期:  2021-12-29
  • 修回日期:  2022-05-26
  • 网络出版日期:  2023-03-09

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