滇西北地区现今构造应力状态及其与地震的关系

樊文杰 崔效锋 赵小艳

樊文杰,崔效锋,赵小艳. 2022. 滇西北地区现今构造应力状态及其与地震的关系. 地震学报,44(4):632−643 doi: 10.11939/jass.20210036
引用本文: 樊文杰,崔效锋,赵小艳. 2022. 滇西北地区现今构造应力状态及其与地震的关系. 地震学报,44(4):632−643 doi: 10.11939/jass.20210036
Fan W J,Cui X F,Zhao X Y. 2022. Current state of tectonic stress in northwestern Yunnan and its relationship with earthquakes. Acta Seismologica Sinica,44(4):632−643 doi: 10.11939/jass.20210036
Citation: Fan W J,Cui X F,Zhao X Y. 2022. Current state of tectonic stress in northwestern Yunnan and its relationship with earthquakes. Acta Seismologica Sinica44(4):632−643 doi: 10.11939/jass.20210036

滇西北地区现今构造应力状态及其与地震的关系

doi: 10.11939/jass.20210036
基金项目: 应急管理部国家自然灾害防治研究院中央级公益性科研院所基本科研业务专项资助项目(ZDJ2019-21)资助
详细信息
    作者简介:

    樊文杰,硕士,工程师,主要从事构造应力场反演、震磁关系方面的研究,e-mail:fan_095011106@126.com

  • 中图分类号: P315.727

Current state of tectonic stress in northwestern Yunnan and its relationship with earthquakes

Funds: Zoback M L. 1992. First- and second-order patterns of stress in the lithosphere: The World Stress Map project[J]. J Geophys Res,97(B8): 11703-11728.
  • 摘要: 基于搜集到的2000—2018年滇西北地区MS≥3.0地震的震源机制解,运用线性叠加反演法进行应力场反演,分析了滇西北地区现今的构造应力状态,进一步探讨了应力张量方差的时空分布与地震活动的关系。结果显示:① 滇西北地区地震的震源机制解类型复杂,主要以走滑型(46%)为主,正断型(27%)次之;② 研究区的构造应力场具有整体的一致性和局部的非均匀性,呈现为NNW向挤压和ENE向拉张的走滑型应力结构,说明研究区受到来自NNW向的水平挤压作用,对该地区上地壳运动和断裂活动起主导作用;③ 滇西北地区的应力张量方差大都小于0.2,除北部一些地区外,应力场基本处于均匀状态。根据应力张量方差随时间的变化和后续地震可知,中强地震大都发生在应力张量方差值低于0.2的情形,且主要发生在应力张量方差减小即震源机制解趋于一致的过程中。空间上这些地震基本都发生在应力张量方差的低值分布区及其边缘,这一结果有助于判定发震地点和了解区域应力集中增强过程。

     

  • 图  1  本研究所用滇西北地震震源机制解的空间分布图

    震源机制解按照Zoback等(1992)分类,震源机制解沙滩球大小随震级增大而增大

    Figure  1.  The spatial distribution of focal mechanism solutions of the earthquakes in northwestern Yunnan used in this study

    The mechanism solutions are classified according to Zoback et al (1992),the size of the beach balls increases with the magnitude of the earthquakes

    图  2  P轴(a)和T轴(b)的方位分布及方位角统计玫瑰图

    图中N为地震频次;线段的长短代表倾伏角大小,线段越长,倾伏角越小

    Figure  2.  The distribution of azimuth and azimuth roses of P axes and T axes

    N is the number of earthquakes. The length of the line represents the size of the plunge. The longer the lines,the lower the plunges

    图  3  P轴(a)和T轴(b)的倾伏角统计玫瑰图(图中N为地震频次)

    Figure  3.  The plunge roses of P axes (a) and T axes (b) where N is the number of earthquakes

    图  4  主应力轴及其95%置信区间(彩色区域)的下半球等面积投影

    Figure  4.  Lower-hemisphere equal-area projection of principle stress axes and their 95% confidence regions (colorful part)

    图  5  区域分网格反演得到的研究区最大主应力方位分布图

    Figure  5.  Distribution of maximum principal stress orientation in the studied area by regional grid inversion

    图  6  区域分网格反演得到的研究区应力张量方差分布图

    Figure  6.  Distribution of stress tensor variance in the studied area obtained by regional grid inversion

    图  7  2000—2018年研究区应力张量方差随时间变化曲线以及MS≥5.0地震分布

    Figure  7.  Variation of stress tensor variance and MS≥5.0 earthquakes in the studied area in the period of 2000−2018

    表  1  线性叠加反演得到的滇西北地区最优应力张量

    Table  1.   The best-fitting stress tensor of northwestern Yunnan by using linear superposition stress inversion

    最大主应力S1中间主应力S2最小主应力S3应力形因子ϕ应力类型
    方位/º倾伏角/º方位/º倾伏角/º方位/º倾伏角/º
    167.8 7.9 5.8 81.6 258.3 2.5 0.8 走滑型
    下载: 导出CSV

    表  2  2000—2018年研究区MS≥5.0地震的基本信息

    Table  2.   The general information of MS≥5.0 earthquakes from 2000 to 2018 in the studied area

    序号发震时间
    年-月-日
    东经/°北纬/°MS地点
    12001-05-24100.9027.635.8宁蒗
    2 2001-10-27100.5726.236.0永胜
    3 2009-07-10101.0525.555.2姚安
    4 2009-11-02100.7025.955.0宾川
    5 2012-06-24100.7027.705.7宁蒗
    6 2013-03-0399.7825.935.5洱源
    7 2013-04-1799.8025.905.0洱源
    8 2016-05-1899.5326.095.0云龙
    92017-03-2799.8025.895.1漾濞
    下载: 导出CSV
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  • 收稿日期:  2021-03-09
  • 修回日期:  2021-05-24
  • 网络出版日期:  2022-07-14
  • 刊出日期:  2022-08-16

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