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地震预报计划的许多研究工作集中在期望未来震源区的岩石上能显示出扩容现象:即在高应力水平下裂隙的扩展.在裂隙介质中地震波传播理论的最近发展证明,在裂隙充满整个构造的情况下,地震波传播通过断裂构造时,剪切波将发生分裂.剪切波的这种分裂现象在地震图中引起了偏振异常.同时指出,通过分析这些异常可以识别和监测由震前应力诱发的扩容.在此,我们还介绍一些支持这种假设的新观测.
Much research work in the earthquake prediction program has focused on the expansion of rocks expected in future source regions: the expansion of fractures at high stress levels.Recent developments in the theory of seismic wave propagation in fractured media have demonstrated that in fractures that fill the entire structure In this case, the shear wave will split when the seismic wave propagates through the fault structure, and this splitting phenomenon of the shear wave causes polarization anomaly in the seismogram, and at the same time indicates that by analyzing these anomalies, the pre-seismic stress-induced Here we also introduce some new observations in support of this assumption.