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本文应用关于粘弹介质的弹性力学三维有限元方法,研究了定常速率加载边界条件下以断层闭锁模拟震源的“孕震”过程,並将所求得的层状介质应力—应变场与视电阻率的“前兆”变化相关联,以此给出该“孕震”过程中地表视电阻率“前兆”变化的时空分布,从而揭示水平层状介质视电阻率的变化与震源区应变场之间的关系。计算结果表明,粘弹性介质的存在,对孕震过程起着相当重要的作用。介质中应力集中程度与材料粘弹性有着密切的关系。另一方面,对于视电阻率前兆而言,其时空分布不仅与大范围的应力—应变场有关,而且还与台站探测范围内介质的力学、电性结构条件相关联。
In this paper, the three-dimensional finite element method of elastic mechanics for viscoelastic media is used to study the “seismogenic” process of fault source blocking the simulated seismic source under the condition of constant velocity loading boundary. The stress-strain field and the apparent resistance Rate of “precursory” changes associated with this in order to give the “geocentric” surface apparent resistivity “precursor” changes in space-time distribution, revealing the horizontal layered media apparent resistivity changes and the source region of the strain field Relationship. The calculation results show that the existence of viscoelastic medium plays an important role in the process of seismogenic process. The degree of stress concentration in a medium is closely related to the viscoelasticity of the material. On the other hand, the temporal and spatial distributions of apparent resistivity precursors are not only related to a wide range of stress-strain fields, but also to the mechanical and electrical structural conditions of the medium within the detection range of the station.