含超压气体裂隙震源模式及其力学验证

在地幔深处和活动构造带上存在不断上升的流体流,震源附近存在着流体和裂隙。本文从这些事实出发,根据水等流体在高温下成气态的原理和气体特性,分析了地幔气体向震源区附近积聚的过程。指出随着震源区附近裂隙中高能气体的积聚,可对围岩施加不断增大的应力,最后导致岩层断裂错动而形成地震。提出了不同条件下的震源模式及其力学模型,并从地面最大位移及形变分布规律等方面对此地震模式进行了验证。

SEISMIC MODEL OF THE CRACK CONTAINING HYPERPRESSURE GAS AND ITS MECHANICAI DEMONSTRATION

Based on the facts that the fluid of gas continusly rise in the deep mantle and the active tectonic belt,and that there is fluid and crack nearby the hypocentre; according to the characteristic of gas and the principle that the fluid and water etc. become gas certainly at high temperature;it is proposed that the gas accumulating in the crack nearby hypocenter can exert larger and larger stress to the rocks about it ,finally,make the rocks breaking and staggering and cause the earthquake starting. On these grounds,the seismic models and the mechanical patterns under different conditions are given. By the mechanical analysis,the models are tested and verified from the respects of maximal displacement on ground and distribution of deformation etc..