Slip history of the 2016 M-w 7.0 Kumamoto earthquake: Intraplate rupture in complex tectonic environment
Slip history of the 2016 M-w 7.0 Kumamoto earthquake: Intraplate rupture in complex tectonic environment
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2016年熊本7.0级地震的滑动历史：复杂构造环境下的板内破裂
DOI：
10.1002/2016gl071543
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发表时间：
2017
影响因子：
5.2
通讯作者：
Yao Zhenxin
中科院分区：
文献类型：
--
作者：
Hao Jinlai;Ji Chen;Yao Zhenxin
利用强震观测、远震宽带体波、长周期面波等波形约束了2016Mw7.0熊本地震的破裂历史。其断层几何形状由Hinagu(定向205°，倾角73°)和Futagawa(定向235°，倾角60°)两段模拟。计算结果较好地反映了力矩张量解与地表断层轨迹之间的差异。它揭示了一个复杂的破裂过程，它始于西那古段的右旋运动，向东北方向单向传播，15 后，S在阿索火山附近停止正常断层运动。平均滑移量为1.80 m，上升时间为2.0 S，滑动速率为1.2 m/S。破裂没有明显的延迟就穿过了一个约30°的断层交汇处，这可能是动态“解锁”的结果。最大凹凸体的东北边界可能标志着地震孕育区的底部，在阿索火山附近，地震孕育区逐渐变浅。
Rupture history of the 2016Mw7.0 Kumamoto earthquake is constrained by using the waveforms of strong motion observations, teleseismic broadband body waves, and long‐period surface waves. Its fault geometry is modeled with Hinagu (orienting 205° and dipping 73°) and Futagawa (orienting 235° and dipping 60°), two segments. The result reconciles the difference between moment tensor solutions and the surface fault trace. It reveals a complex rupture process that initiated on the Hinagu segment in dextral motion, propagated northeastward unilaterally, and after 15 s ceased near Aso volcano with normal fault motion. The average slip, rise time, and slip rate are 1.8 m, 2.0 s, and 1.2 m/s, respectively. The rupture broke through an ~30° fault intersection without notable delay, which can be a result of dynamic “unclamping.” The northeast boundary of the largest asperity might mark the bottom of the seismogenic zone, which becomes shallower gradually near Aso volcano.