盈江地区构造应力场和断层识别的联合迭代式反演研究

冯兵 朱良玉 惠航 王文青 柴旭超 姬东姣

冯兵,朱良玉,惠航,王文青,柴旭超,姬东姣. 2022. 盈江地区构造应力场和断层识别的联合迭代式反演研究. 地震学报,44(4):619−631 doi: 10.11939/jass.20210027
引用本文: 冯兵,朱良玉,惠航,王文青,柴旭超,姬东姣. 2022. 盈江地区构造应力场和断层识别的联合迭代式反演研究. 地震学报,44(4):619−631 doi: 10.11939/jass.20210027
Feng B,Zhu L Y,Hui H,Wang W Q,Chai X C,Ji D J. 2022. Joint iterative inversion of tectonic stress field and fault identification in Yingjiang area. Acta Seismologica Sinica,44(4):619−631 doi: 10.11939/jass.20210027
Citation: Feng B,Zhu L Y,Hui H,Wang W Q,Chai X C,Ji D J. 2022. Joint iterative inversion of tectonic stress field and fault identification in Yingjiang area. Acta Seismologica Sinica44(4):619−631 doi: 10.11939/jass.20210027

盈江地区构造应力场和断层识别的联合迭代式反演研究

doi: 10.11939/jass.20210027
基金项目: 吉林长白山火山国家野外科学观测研究站研究课题(NORSCBS20-06)、地震科技星火计划青年项目(XH21065Y)、中国地震局第二监测中心科学技术基金(KJ20200202)和地震科技星火计划(XH20083)共同资助
详细信息
    通讯作者:

    冯兵,学士,助理工程师,主要从事震源机制构造应力场反演、震源物理破裂、测震数据应用等研究,e-mail:2662103261@qq.com

  • 中图分类号: P315.3+3

Joint iterative inversion of tectonic stress field and fault identification in Yingjiang area

  • 摘要: 搜集了盈江及其邻区5组地震序列震源机制解并反演得到该区域的构造应力场。研究结果显示:盈江地区整体主压应力以NNE向为主,主张应力以ESE向为主;但其局部应力场不完全一致,沿苏典断裂分布的主压应力轴走向随着断裂走向由北向南延伸角度逐渐向北偏移,而盈江地区的西南部,其主压应力走向更偏向于东,这可能与大盈江断裂的横向拉伸有关。此外,本研究通过应力场反演识别出了5组地震序列震源机制解的主发震断层节面的走向、倾角、滑动角及发震断层的摩擦系数,为今后该区域的地震研究及地壳动力学变迁提供了参考。

     

  • 图  1  盈江区域地震序列震源机制解空间分布图

    F1:怒江断裂;F2:龙陵—瑞丽断裂;F3:瓦德龙断裂;F4:大盈江断裂;F5:昔马—盘龙山断裂;F6:苏典断裂;F7:槟榔断裂;F8:猴桥—中和断裂;F9:固东—腾冲断裂图中AE区分别代表2008年3月21日、8月21日及9月3日盈江地震序列、2011年3月10日盈江地震序列和2011年8月9日腾冲地震序列的震源机制解分区

    Figure  1.  Spatial distribution of focal mechanism solutions of earthquake sequences in Yingjiang region

    F1:Nujiang fault;F2:Longling-Ruili fault;F3:Wadelon fault;F4:Dayingjiang fault;F5:Xima-Panlongshan fault;F6:Sudian fault;F7:Binglang fault;F8:Houqiao-Zhonghe fault;F9:Gudong-Tengchong fault.AE in the figure represent the focal mechanism solution partition of Yingjiang earthquake sequences on 21 March 2008,21 August 2008,3 September 2008,10 March 2011 and Tengchong earthquake sequence on 9August 2011,respectively

    图  2  断层不稳定性的莫尔圆定义(Vavryčuk,2014

    红色圆点标出了以不稳定性为特征I=1的主断层上的牵引力,蓝色圆点标出了以任意不稳定性为特征I的主断层上的牵引力

    Figure  2.  Definition of the fault instability in Mohr’s diagram (Vavryčuk,2014

    The red solid circle marks the traction on the main fault characterized by instability I=1,and the blue solid circle marks the traction on the main fault characterized by arbitrary instability

    图  3  AE区(a—e)5组地震序列震源机制解联合迭代反演的应力场结果

    左侧为地震序列震源机制解反演的断层摩尔圆分布,右侧为主轴方向及PT

    Figure  3.  Stress field results of joint iterative inversion for focal mechanism solutions of five seismic sequences in areas AE (a−e)

    The left side is the fault Mohr’s circle distribution inversed by focal mechanism solutions of seismi sequences, and the right side is the main axis direction and PT axis

    图  4  5组地震序列构造应力场反演的应力形因子R的分布(左)及主应力轴方向(右)

    Figure  4.  Stress shape factor R distribution (left) and principal stress axis direction (right) of tectonic stress field inversion results for five earthquake sequences

    (a) 2008-13-21;(b) 2008-08-21;(c) 2008-09-03;(d) 2011-03-10;(e) 2011-08-09

    图  5  5组地震序列震源机制解应力反演识别出的主断层节面图

    Ⅰ :地震序列震源机制解的双节面下半球投影图;Ⅱ :最优断层节面下半球投影;Ⅲ :两组震源丛最优发震断层的主断层节面;Ⅳ :主断层节面的PT

    Figure  5.  Nodal map of main fault identified by stress inversion of focal mechanism solutions of five groups of earthquake sequences

    Ⅰ :Double-nodal lower hemispherical projection of focal mechanism solutions of the earthquake sequence;Ⅱ :Lower hemispherical projection of optimal fault nodal plane;Ⅲ :Optimal occurrence of the main fault nodal plane for the two sets of focal clusters;Ⅳ :The P and T axis of the main fault nodal plane (a) 2008-03-21;(b) 2008-08-21;(c) 2008-09-03;(d) 2011-03-10;(e) 2011-08-09

    图  6  主压应力轴应力场分布模型图

    Figure  6.  Stress field distribution model diagram of principal compressive stress axis

    表  1  构造应力场应力主轴反演结果

    Table  1.   Inversion results of stress principal axis of tectonic stress field

    地震序列主震
    发震日期
    分区震源机制解
    个数
    σ1σ2σ3应力形因子R
    方位角/°倾角/°方位角/°倾角/°方位角/°倾角/°
    2008-03-21 A 17 44 3 258 86 135 2 0.78
    2008-08-21 B 36 215 33 40 57 306 2 0.40
    2008-09-03 C 48 34 3 212 87 304 0 0.75
    2011-03-10 D 61 193 15 333 70 99 12 0.57
    2011-08-09 E 23 195 1 294 83 105 7 0.65
    下载: 导出CSV

    表  2  迭代应力反演识别出的最优主断层节面

    Table  2.   Optimal main fault nodal plane identified by iterative stress inversion

    地震序列主震
    发震日期
    反演识别的两组主断层节面地震序列主震
    发震日期
    反演识别的两组主断层节面
    走向/°倾角/°滑动角/°走向/°倾角/°滑动角/°
    2008-03-21 250 89 4 2011-03-10 158 88 161
    199 86 −178 223 72 −7
    2008-08-21 241 77 −31 2011-08-09 164 85 176
    12 73 −151 225 84 3
    2008-09-03 187 89 −177
    60 88 −3
    下载: 导出CSV
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出版历程
  • 收稿日期:  2021-02-23
  • 修回日期:  2021-08-17
  • 网络出版日期:  2022-06-27
  • 刊出日期:  2022-08-16

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