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    广西凌云-凤山"6·28"震群: 岩溶发育区流体触发断层浅层活动机理

    李志勇 李细光 严小敏 姚宏 曾佐勋 王鹏来

    李志勇, 李细光, 严小敏, 姚宏, 曾佐勋, 王鹏来, 2015. 广西凌云-凤山'6·28'震群: 岩溶发育区流体触发断层浅层活动机理. 地球科学, 40(10): 1667-1676. doi: 10.3799/dqkx.2015.150
    引用本文: 李志勇, 李细光, 严小敏, 姚宏, 曾佐勋, 王鹏来, 2015. 广西凌云-凤山"6·28"震群: 岩溶发育区流体触发断层浅层活动机理. 地球科学, 40(10): 1667-1676. doi: 10.3799/dqkx.2015.150
    Li Zhiyong, Li Xiguang, Yan Xiaomin, Yao Hong, Zeng Zuoxun, Wang Penglai, 2015. Earthquake Swarms on June 28th of 2010, near Lingyun and Fengshan County, South China: Shallow Seismic Activity of Fault Induced by Surface Fluid in Karst Geology Area. Earth Science, 40(10): 1667-1676. doi: 10.3799/dqkx.2015.150
    Citation: Li Zhiyong, Li Xiguang, Yan Xiaomin, Yao Hong, Zeng Zuoxun, Wang Penglai, 2015. Earthquake Swarms on June 28th of 2010, near Lingyun and Fengshan County, South China: Shallow Seismic Activity of Fault Induced by Surface Fluid in Karst Geology Area. Earth Science, 40(10): 1667-1676. doi: 10.3799/dqkx.2015.150

    广西凌云-凤山"6·28"震群: 岩溶发育区流体触发断层浅层活动机理

    doi: 10.3799/dqkx.2015.150
    基金项目: 

    广西地震科学基础研究项目 桂科攻12426001-4

    广西科学研究与技术开发计划项目 桂科攻1298005-1

    广西科学研究与技术开发计划项目 桂科攻1355010-6

    详细信息
      作者简介:

      李志勇(1979-), 男, 博士, 主要从事构造地质学教学、构造定量解析与模拟研究.E-mail: zhiyong.li@cug.edu.cn

      通讯作者:

      李细光, E-mail: hnouyang@163.com

    • 中图分类号: P315.1

    Earthquake Swarms on June 28th of 2010, near Lingyun and Fengshan County, South China: Shallow Seismic Activity of Fault Induced by Surface Fluid in Karst Geology Area

    • 摘要: 2010年6月28日, 广西凌云-凤山地区在特大强降雨活动之后发生密集的浅源低震级地震活动, 造成严重经济损失.该震群活动是否与强降雨有关, 强降雨是否可以触发震群活动, 仍存在争议.基于该地区地震构造背景, 对震群的活动特征、震源机制解及其与断裂构造的关系进行了分析, 并建立了断层内流体孔隙压力触发断层滑动的力学模型.该浅层震群活动的发生时间、震中位置和活动频次均与特大强降雨具有密切的相关性.认为岩溶地区长期干旱和地下水缺乏有利于地壳浅层的应力积累.地表流体很难通过下渗扩散触发断层的完全解锁和深部滑动, 但岩溶裂隙和管道有利于地表流体快速汇聚下渗, 引起断层浅层强度的弱化, 导致断层部分解锁滑动.并在断层附近形成局部应力场异常和离散的封闭性超压流体, 触发密集的浅层低震级震群活动.

       

    • 图  1  震群震中位置及降雨量分布

      Fig.  1.  Location of epicenters and distribution of rainfall

      图  2  地质构造和震群位置

      F1.百色-合浦断裂带;F2.巴马-博白断裂带;F3.河池-宜州断裂带;F4.木伦-东兰-逻楼断裂带;F5.更新-凌云-那能断裂带;f1.江州-高家洞断裂;f2.逻楼-江州断裂;f3.寅村断裂;f4.坡楼断裂;f5.那林断裂;f6.岩板断裂;f7.逻楼-平吕断裂;f8.陇仓断裂;f9.沙里-弄所断裂

      Fig.  2.  Geology setting and earthquake swarms

      图  3  2010年6月江洲流动台记录的S-P波速差随时间变化

      Fig.  3.  The time series of S-P velocity difference recorded by mobile Seismic station in Jiangzhou, June 2010

      图  4  震源分布与断层关系剖面

      f1.江州-高家洞断裂;f2.逻楼-高家洞断裂;震群精定位分析结果由广西地震局台网中心提供

      Fig.  4.  Cross section profile of earthquake swarms and faults

      图  5  凌云凤山震群日降雨量与地震日频次统计

      a.江州站降雨量;b.罗楼站降雨量;c.地震日频次;数据由广西区气象局提供

      Fig.  5.  The time series of the daily rain amount

      图  6  断层内流体孔隙压力触发断层滑动的应力模型

      a.岩溶管道和裂隙有利于地表流体快速下渗,从而弱化断层强度,引起断层浅层部位的局部解锁滑动;b.断层内流体孔隙压力触发断层滑动的影响深度,图中假定岩石平均密度为2.5×103 kg/m3,断层面摩擦系数为0.6;c.流体作用下断层滑动准的应力莫尔图解,φ为内摩擦角,σn为断层面上正应力,σn为断层面上剪应力

      Fig.  6.  Stress model showing fault slip triggered by pore-fluid pressure

      表  1  凌云-凤山震群ML≥2.0地震震源机制(蒙荣国等,2012)

      Table  1.   Focal mechanism of the earthquake swarms with ML≥2.0

      时间 纬度(N) 经度(E) ML 节面Ⅰ 节面Ⅱ P轴 T轴 滑动性质
      走向 倾角 走向 倾角 走向 倾角 走向 倾角
      6月28日12∶41 24.38° 106.90° 3.0 26° 22° 190° 69° 105° 23° 269° 66° 逆倾滑动
      6月28日17∶36 24.38° 106.88° 2.0 142° 23° 321° 67° 50° 68° 231° 22° 正倾滑动
      6月28日18∶02 24.35° 106.95° 2.4 112° 81° 30° 173° 47° 45° 30° 正倾滑动
      6月28日19∶55 24.40° 106.86° 2.6 281° 20° 67° 73° 142° 60° 346° 28° 正倾滑动
      6月28日19∶58 24.38° 106.90° 2.6 292° 76° 180° 34° 347° 49° 225° 24° 正倾滑动
      6月28日20∶08 24.38° 106.88° 2.3 266° 24° 59° 69° 132° 65° 337° 23° 正倾滑动
      6月28日20∶34 24.40° 106.88° 2.4 210° 67° 320° 51° 348° 46° 88° 正倾滑动
      6月28日21∶06 24.38° 106.90° 2.3 271° 27° 88° 299° 37° 70° 41° 走滑
      6月28日21∶34 24.38° 106.88° 2.2 29° 26° 206° 64° 293° 71° 117° 19° 正倾滑动
      6月28日22∶02 24.38° 106.88° 2.5 285° 19° 138° 74° 243° 60° 40° 28° 正倾滑动
      6月28日23∶13 24.38° 106.90° 2.5 31° 23° 190° 69° 265° 65° 106° 23° 正倾滑动
      6月29日02∶03 24.38° 106.88° 2.2 117° 89° 24° 33° 177° 38° 55° 35° 走滑
      6月29日02∶04 24.41° 106.85° 2.2 36° 24° 220° 66° 314° 68° 129° 21° 正倾滑动
      6月29日02∶01 24.38° 106.88° 3.1 120° 87° 26° 31° 182° 40° 56° 35° 走滑
      6月29日03∶11 24.38° 106.88° 2.0 26° 36° 258° 66° 148° 17° 27° 59° 逆倾滑动
      6月29日06∶09 24.40° 106.88° 2.5 18° 37° 262° 72° 148° 20° 30° 52° 逆倾滑动
      6月29日06∶05 24.38° 106.86° 2.3 120° 87° 27° 43° 175° 34° 63° 29° 走滑
      6月29日10∶38 24.38° 106.91° 2.5 24° 22° 195° 68° 279° 66° 107° 23° 正倾滑动
      6月29日11∶22 24.38° 106.88° 2.3 30° 32° 152° 72° 208° 82° 22° 正倾滑动
      6月29日13∶06 24.38° 106.88° 2.3 275° 28° 185° 90° 300° 39° 70° 39° 走滑
      6月30日10∶17 24.38° 106.91° 2.3 29° 76° 274° 31° 88° 51° 320° 26° 正倾滑动
      6月30日13∶51 24.38° 106.90° 2.8 204° 48° 308° 74° 355° 41° 250° 16° 正倾滑动
      7月01日10∶27 24.38° 106.86° 3.2 26° 23° 210° 67° 117° 22° 300° 68° 逆倾滑动
      7月04日19∶45 24.45° 106.88° 2.6 197° 89° 290° 26° 311° 41° 83° 38° 走滑
      7月05日03∶24 24.38° 106.88° 2.5 262° 27° 154° 81° 271° 48° 43° 31° 走滑
      下载: 导出CSV
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    • 收稿日期:  2014-11-17
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