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本文初步讨论了半无限分层弹性空间中离散螺型位错群不均匀运动过程的二维问题,以及岩石层中浅源走滑型地震的孕育过程。研究表明,在区域构造应力和象力作用下,岩石层中部断面上高摩擦阻抗闭锁被克服之后,断面位错将逐渐加速运动,在花岗岩层上界面附近,位错速度接近横波速度(等价于发生地震);该运动过程的持续时间约为几天至几个月;当岩石层中、上部的物质常数n=3和闭锁深度η_1=60km时,期望在大地震之前位错加速运动的持续时间内,观测到总应变量为10~(-7).所以,上述过程可能是大地震前短期前兆异常变化的机制之一。
In this paper, two-dimensional problems of inhomogeneous movement of discrete screw dislocation groups in semi-infinite stratified elastic space and the breeding process of shallow-source strike-slip earthquakes in rock layers are discussed. The results show that the fracture dislocation will accelerate gradually after the high frictional impedance lockout in the middle section of the rock layer is overcome under the regional tectonic stress and elephant force. Near the interface above the granite layer, the dislocation velocity is close to the S-wave velocity In the event of an earthquake). The duration of the movement is about several days to several months. When the mass constant n = 3 and the lock-up depth η_1 = 60km in the upper and lower rock layers, it is expected that the dislocation accelerates During the duration, the total observed strain is 10 ~ (-7), so the above process may be one of the mechanisms of short-term precursory anomalies before the earthquake.