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最近报道的因3次独立的暴雨引发的雨水触发地震都发生在喀斯特地质区域。本人在该文中讨论了在强降雨直接侵入喀斯特地区以后喀斯特水文地质是怎样通过水流通道控制雨水触发地震的。这种通道导致水头大量增加,更重要的是,它极大地增加了作用于地下孔弹性介质的垂直应力。快速加载于孔弹性介质的载荷,通过以一种观测到的向水库注水类似的方式,增加深部孔隙压力,从而诱发地震。采用简单的一维孔弹性介质模型可以看到,深部流体压力的激增是边界处压力阶跃的实质性的一部分,接下来是与典型的线性扩散问题相关的随时间变化的孔隙压力的增加。这些结果含有对触发地震所必需的流体压力变化的暗示,并导致以下尚待检验的假设:明显的雨水触发地震将只发生在喀斯特地区。
Recently reported rain-triggered earthquakes triggered by three separate heavy rains occurred in the karst geologic region. In this paper, I discuss how karst hydrogeology triggered stormwater-triggered earthquakes through water channels after heavy rains intruded directly into karst regions. This channel leads to a substantial increase in the head, and more importantly, it greatly increases the vertical stress acting on the elastic medium in the subsurface. The loads that are quickly loaded on the hole elastic media induce earthquakes by increasing the deep pore pressure in a manner similar to the observed water injection into the reservoir. Using a simple one-dimensional pore-elastic media model it can be seen that the explosion of deep fluid pressure is a substantial part of the pressure step at the boundary followed by an increase in pore pressure over time associated with typical linear diffusion problems. These results contain hints of changes in fluid pressure necessary to trigger earthquakes and lead to the following assumptions to be tested: a clear rain-triggered earthquake will only occur in the karst area.