2021年云南漾濞MS6.4地震动态应力对后续余震活动的触发作用

刘容 陈强 杨莹辉 钟霞 苑雨

刘容,陈强,杨莹辉,钟霞,苑雨. 2023. 2021年云南漾濞MS6.4地震动态应力对后续余震活动的触发作用. 地震学报,45(1):17−28 doi: 10.11939/jass.20210157
引用本文: 刘容,陈强,杨莹辉,钟霞,苑雨. 2023. 2021年云南漾濞MS6.4地震动态应力对后续余震活动的触发作用. 地震学报,45(1):17−28 doi: 10.11939/jass.20210157
Liu R,Chen Q,Yang Y H,Zhong X,Yuan Y. 2023. Impact of dynamic stress on aftershock triggering of the 2021 Yunnan Yangbi MS6.4 earthquake. Acta Seismologica Sinica,45(1):17−28 doi: 10.11939/jass.20210157
Citation: Liu R,Chen Q,Yang Y H,Zhong X,Yuan Y. 2023. Impact of dynamic stress on aftershock triggering of the 2021 Yunnan Yangbi MS6.4 earthquake. Acta Seismologica Sinica45(1):17−28 doi: 10.11939/jass.20210157

2021年云南漾濞MS6.4地震动态应力对后续余震活动的触发作用

doi: 10.11939/jass.20210157
详细信息
    通讯作者:

    刘容,硕士研究生,主要研究方向为地震震源破裂过程及其应力触发,e-mail:1327330109@qq.com

  • 中图分类号: P315.33,P315.727

Impact of dynamic stress on aftershock triggering of the 2021 Yunnan Yangbi MS6.4 earthquake

  • 摘要: 选取IRIS远震台站波形数据,反演了云南漾濞MS6.4地震震源破裂过程,计算了断层破裂在近场产生的动态库仑破裂应力变化,并讨论了主震对近场余震活动的动态应力触发作用。结果显示:动态库仑应力演化过程与震源破裂特征反演结果一致,其大小分布与地震序列分布的疏密程度也具有较好的相关性。主震产生的静态和动态库仑破裂应力均促进余震的发生,但相比静态应力,余震位于库仑破裂应力正值区域的比例提高了21%,余震与动态库仑应力变化的正负区域有更好的一致性,动态应力能更好地解释震后余震分布的空间特征。垂直于地震序列主干10 km处出现小震丛集,该现象可能是由主震产生的动态库仑破裂应力占主导作用所致。定量分析主震对余震的动态应力触发结果显示,主震后一周内MS4.0以上的8次余震接收点均受到了动态库仑破裂应力的触发作用。

     

  • 图  1  云南漾濞MS6.4地震震中区构造背景(a)、地震序列空间分布(b)及剖面上的投影(c)

    Figure  1.  Tectonic setting (a) of the epicentral area and spatial distribution (b) for Yunnan Yangbi MS6.4 earthquake sequence and its projection on profile (c)

    图  2  台站分布和P波垂向位移理论图(红线)与观测波形(黑线)的拟合情况(a)以及每2秒破裂快照(b)

    Figure  2.  Station distribution and the fitting of P-wave vertical displacement theoretical graph (red line) and observed waveform (black line) (a) and snapshot shown every 2 s (b)

    图  3  云南漾濞MS6.4地震静态应力变化(a)和地震序列密度分布及MS4.0以上余震震源机制(b)

    Figure  3.  Static stress change of the Yunnan Yangbi MS6.4 earthquake (a) and density distribution of the earthquake sequence and focal mechanisms of aftershocks above MS4.0

    4  ∆CFS动态演化

    图中百分数表示余震位于动态库仑破裂应力正值区域的比例

    4.  Dynamic evolution of ∆CFS

    The percentage in the figure shows the proportion of aftershocks in the positive value area of dynamic Coulomb stress

    图  4  ∆CFS动态演化

    图中百分数表示余震位于动态库仑破裂应力正值区域的比例

    Figure  4.  Dynamic evolution of ∆CFS

    The percentage in the figure shows the proportion of aftershocks in the positive value area of dynamic Coulomb stress

    图  5  图3b中8次余震震源接收点处的库仑破裂应力时程

    Figure  5.  Coulomb rupture stress time history at the receiving points of the aftershock source shown in Fig.3b

    表  1  云南漾濞MS6.4地震震源参数

    Table  1.   Focal mechanism parameters of the Yunnan Yangbi MS6.4 earthquake

    发震日期 震中位置MW深度/km节面Ⅰ节面Ⅱ来源
    年-月-日 北纬/°东经/°走向/°倾角/°滑动角/°走向/°倾角/°滑动角/°
    25.61 100.02 6.1 15.0 46 78 4 315 86 168 GCMT (2021)
    2021-05-21 25.73 100.01 6.1 9.0 135 82 −165 43 75 −9 USGS (2021)
    25.69 99.88 5.9 7.8 135 75 −168 42 78 −15 重定位(龙锋等,2021
    下载: 导出CSV

    表  2  云南漾濞MS6.4地震震源附近地壳分层模型

    Table  2.   Crustal layered model near the seismic source of the Yunnan Yangbi MS6.4 earthquake

    深度/kmvP/(km·s−1vS/(km·s−1地壳密度/(g·cm−3QPQS
    07.754.473.37600300
    44.852.803.37600300
    166.253.613.37600300
    226.403.703.37600300
    下载: 导出CSV

    表  3  主震对MS≥4.0余震应力触发情况

    Table  3.   The stress trigger of the main shock to MS≥4.0 aftershocks

    地震序号与主震震中的
    距离/km
    开始变化
    时间/s
    达到峰值
    时间/s
    ∆CFS峰值
    /MPa
    趋于稳定
    时间/s
    稳定值
    /MPa
    应力触发
    1 8.67 2.0 3.7 0.13 13 0.09 动态、静态应力触发
    2 12.68 1.7 5.3 0.83 16 −0.001 动态应力触发
    3 13.49 2.0 5.3 0.47 13 0.01 动态应力触发,静态应力可能触发
    4 13.49 1.9 5.7 0.27 14 −0.02 动态应力触发
    5 2.22 3.0 3.5 0.39 动态应力触发
    6 1.00 1.8 8.4 0.50 12 0.48 动态、静态应力触发
    7 8.98 2.0 7.4 0.12 11 0.09 动态、静态应力触发
    8 11.17 5.0 7.5 0.18 13 0.02 动态应力触发,静态应力可能触发
    下载: 导出CSV
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  • 收稿日期:  2021-10-08
  • 修回日期:  2022-01-11
  • 网络出版日期:  2023-01-11
  • 刊出日期:  2023-01-17

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