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首页> 外文期刊>Pure and Applied Geophysics >A Condition for Super-shear Rupture Propagation in a Heterogeneous Stress Field
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A Condition for Super-shear Rupture Propagation in a Heterogeneous Stress Field

机译：非均质应力场中超剪切断裂扩展的条件

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— We have used numerical simulations with the boundary integral equation method to investigate a mechanism to excite super-shear rupture velocities in a homogeneous stress field including an asperity of increased initial stress. When the rupture, with the slip-weakening distance selected to generate sub-Rayleigh speed, encounters the asperity it either accelerates to super-shear velocities or maintains the sub-Rayleigh speed, dependent on the size and amplitude of the asperity. Three classes of rupture propagation are identified: the velocity (a) for the most narrow asperities increases slowly towards the Rayleigh wave speed, (b) for intermediate width of the asperities jumps to super-shear values for a short distance but then decreases to sub-Rayleigh wave speeds, and (c) for the widest asperities jumps to super-shear values and pertains to values between the S- and P-wave velocities. The transitions between the three classes of rupture propagation are characterized by very narrow (critical) ranges of rupture resistance. If the size of the initial asperity is smaller than critical, it becomes difficult for rupture to propagate with super-shear velocities even if the initial stress level is high. Our results suggest that stress variation along the rupture path helps homogenize the rupture velocity and propagate with sub-Rayleigh wave speeds.
机译：—我们已经使用边界积分方程方法进行了数值模拟，以研究一种在均质应力场中激发超剪切断裂速度的机制，其中包括初始应力的增加。当选择了弱化滑动距离以产生次瑞利速度的破裂遇到凹凸不平时，它会加速至超剪切速度，或者根据凹凸不平的大小和幅度保持次瑞利速度。确定了三类破裂传播：速度（a）最窄的粗糙物朝瑞利波速度缓慢增加，（b）中等宽度的粗糙物在短距离内跳到超剪切值，但随后减小到-瑞利波速度，（c）代表最宽的凹凸，跳至超剪切值，并且属于S波和P波速度之间的值。三种类型的破裂传播之间的过渡具有非常窄的（临界）破裂阻力范围。如果初始凹凸的大小小于临界值，则即使初始应力水平很高，也难以以超剪切速度传播破裂。我们的结果表明，沿破裂路径的应力变化有助于使破裂速度均匀化并以次瑞利波速度传播。

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