2013年三台MS4.7地震震源机制及发震构造研究

刘岁海 吕锦雄 赵学钦 张刚 文明如

刘岁海,吕锦雄,赵学钦,张刚,文明如. 2021. 2013年三台MS4.7地震震源机制及发震构造研究. 地震学报,43(6):1−14 doi: 10.11939/jass20200201
引用本文: 刘岁海,吕锦雄,赵学钦,张刚,文明如. 2021. 2013年三台MS4.7地震震源机制及发震构造研究. 地震学报,43(6):1−14 doi: 10.11939/jass20200201
Liu S H,Lü J X,Zhao X Q,Zhang G,Wen M R. 2021. Study on earthquake focal mechanism and seismogenic structure of the Santai MS4.7 earthquake in 2013. Acta Seismologica Sinica,43(6):1−14 doi: 10.11939/jass20200201
Citation: Liu S H,Lü J X,Zhao X Q,Zhang G,Wen M R. 2021. Study on earthquake focal mechanism and seismogenic structure of the Santai MS4.7 earthquake in 2013. Acta Seismologica Sinica43(6):1−14 doi: 10.11939/jass20200201

2013年三台MS4.7地震震源机制及发震构造研究

doi: 10.11939/jass20200201
基金项目: 国家自然科学基金青年基金(41672206,41704105)和绵阳市防震减灾局科技计划项目(15ZH0011)联合资助
详细信息
    通讯作者:

    刘岁海,e-mail:liusuihai@swust.edu.cn

  • 中图分类号: P315.3+3

Study on earthquake focal mechanism and seismogenic structure of the Santai MS4.7 earthquake in 2013

  • 摘要: 2013年2月19日四川省绵阳市三台县发生MS4.7地震,震中位于四川盆地中部基底断裂绵阳—三台—大足断裂与蒲江—三台—巴中断裂的交会区域。基于地震目录、震相报告和波形等资料,对地震序列进行重定位,采用近远震联合波形反演求解主震震源机制,结合野外地质调查对该地震的发震构造进行分析。余震序列重定位的空间展布方向为NW-SE向,与节面Ⅰ走向吻合,认为此次地震发震断裂走向为NW-SE,倾向为NE,且破裂面近于直立,发震断层在近NS向的近水平挤压应力作用下作右旋走滑错动。实地调查中未见地表破裂及地表断层行迹,认为发震构造为一隐伏断裂。重定位及通过近远震联合反演所得震源深度分别为21.6和19 km,震源深度反映震源区位于上地壳底部的低速层内。此次地震可能是汶川地震造成的区域构造应力场改变与调整过程中,四川盆地川中地块内隐伏于前震旦纪结晶基底中的高角度断裂重新活动的结果。

     

  • 图  1  研究区构造背景(李明欣,2013

    F1:汶川—青川断裂;F2:映秀—北川断裂;F3:香水断裂;F4:二郞庙断裂;F5:古城断裂;F6:平武—青川断裂;F7:茂汶断裂;F8:黄土梁断裂;F9:龙泉山断裂;F10:永兴断裂;F11:青莲场断裂;F12:梓潼—三台断裂;F13:岷江断裂;F14:黑水断裂;F15:高生庙断裂

    Figure  1.  The tectonic background of the studied area (Li,2013

    F1:Wenchuan-Qingchuan fault; F2:Yingxiu-Beichuan fault; F3:Xiangshui fault; F4:Erlangmiao fault; F5:Gucheng fault; F6:Pingwu-Qingchuan fault; F7:Maowen fault; F8:Huangtuliang fault; F9:Longquanshan fault; F10:Yongxing fault; F11:Qinglianchang fault; F12:Zitong-Santai fault; F13:Minjiang fault; F14:Heishui fault; F15:Gaoshengmiao fault

    图  2  三台地震震中区域台站分布

    Figure  2.  Distribution of stations in epicentral zonefor Santai earthquake

    图  3  三台MS4.7地震序列震中分布图

    Figure  3.   Epicenter distribution diagram of Santai MS4.7 earthquake sequence

    图  4  近远震联合反演的误差—深度分布图及主震震源机制解

    (a) 误差-深度分布图;(b) 本文所得震源机制解;(c) 哈佛大学给出的震源机制解

    Figure  4.  Misfit variation with focal depth using CAP joint method and focal mechanism solutions of the mainshock

    (a) Error-depth distribution diagram;(b) The focal mechanism solution obtained in this study; (c) The focal mechanism solution given by Harvard University

    图  5  三台MS4.7地震震区地震地质图

    Figure  5.  Seismogeologic map for the seismic region of Santai MS4.7 earthquake

    图  6  地壳厚度及速度结构模型(蔡学林等,20082010). 括号内数据为参加平均数,虚线表示壳内低速层

    Figure  6.  Model for the crust thickness and velocity structure (Cai et al,20082010). The data in parentheses is the mean of participating,and the dotted line represents the low velocity layer in the crust

    图  7  构造应力场和震源机制解示意图

    Figure  7.  Sketch map of tectonic stress field and focal mechanism solution

    表  1  三台地震参数

    Table  1.   The parameters of the Santai earthquake

    发震时刻(北京时间)北纬/°东经/°深度/kmMS数据来源
    年-月-日 时:分:秒
    2013-02-19 22:17:41.42 31.21 105.20 29.0 5.1   四川省区域地震台网
    2013-02-19 22:17:43.40 31.21 105.20 20.0 4.7   中国地震台网中心
    2013-02-19 22:17:44.60 31.18 105.26 19.6 4.9   哈佛大学全球矩心矩张量解
    下载: 导出CSV

    表  2  远震台站统计表

    Table  2.   Statistical table of remote seismic stations

    台站名方位角/°震中距/°纬度/°东经/°
    HKPS 136.36 11.94 22N 114
    KBS 347.20 60.05 79N 12
    PET 44.16 43.87 53N 159
    ARU 322.04 40.87 56N 59
    TIXI 10.79 42.36 72N 129
    KIEV 313.46 57.87 51N 29
    UOSS 274.40 43.39 25N 56
    DGAR 224.74 49.78 7S 72
    COCO 191.88 44.16 12S 97
    GUMO 106.82 40.34 14N 145
    下载: 导出CSV

    表  3  地壳速度模型参数表

    Table  3.   Table of crustal velocity model parameters

    名称深度/kmP波速度/(km·s−1)名称深度/kmP波速度/(km·s−1)
    第1层 5 5.86 第4层 23 5.9
    第2层 14 6.0 第5层 36 6.6
    第3层 21 6.3 第6层 40 7.1
    下载: 导出CSV

    表  4  三台地震主震震源机制解参数

    Table  4.     Parameters of focal mechanism solution for the mainshock of Santai earthquake sequence

    节面Ⅰ节面ⅡP T N 来源
    走向/°倾角/°滑动角/°走向/°倾角/°滑动角/°方位/°倾角/°方位/°倾角/°方位/°倾角/°
    320 83 −175 230 85 −5 182 4 274 5 30 85 本文
    316 82 −177 226 87 −8 181 7 271 3 27 82 哈佛大学
    下载: 导出CSV
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  • 收稿日期:  2020-12-22
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