Earthquake instability on a strike‐slip fault
Earthquake instability on a strike‐slip fault
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走滑断层上的地震不稳定性
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
G. Mavko
中科院分区：
文献类型：
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作者：
W. D. Stuart;G. Mavko
利用连续分布的螺旋位错，分析了长的垂直走滑断层上地震失稳的应变软化模型。断层带本构关系由高斯型摩擦定律表示，在该摩擦定律中，超过峰值应力发生滑动软化。峰值应力随深度的高斯分布而变化，最大峰值应力出现在推断震源附近。断层周围的物质被模拟为具有无应力表面和底部的弹性板;强迫是通过在远程板端施加的不断增长的位移。惯性限制不稳定性（一种地震模拟）发生在断层带的应变减弱速度快于附近弹性应力的下降速度时。因此，两个刚度的比值决定了是否会发生失稳。表面应变场不稳定的情况下比稳定的情况下均匀。
A strain softening model for earthquake instability on a long, vertical, strike-slip fault is analyzed using continuously distributed screw dislocations. The fault zone constitutive law is represented by a Gaussian-shaped friction law in which slip softening occurs beyond the peak stress. The peak stress varies as the Gaussian of depth, and the greatest peak stress occurs near the inferred earthquake focus. Material surrounding the fault is modeled by elastic plates with stress-free surface and bottom; forcing is by a growing displacement applied at the remote plate ends. Inertia-limited instability (an earthquake analog) occurs when the fault zone weakens with strain faster than the nearby elastic stress can decrease. Thus ratio of two stiffnesses determines if an instability will occur. Surface strain fields are less uniform for unstable cases than for stable cases.