地震前兆复杂性的数值模拟研究

本文选用向各异性的准弹性介质模型和震源组合模型，应用有限元数模拟方法，研究了短阶临阶段地震前兆的复杂性。给出：临震异常的显现程度取决于观测点距发震构造的贴近程度。观测点赵接近发震构造，异常越明显。在时间分布上，异常先在外围出现后在震中区出现，呈现为异常从外转播的特征。此外，对于在同一观测点上的多手段（多种物理量）观测，由于不同物理量各自依赖于孕震过程中不同的变化因子，因此，同一观测点上的不同物理量

NUMERICAL SIMULATION OF COMPLEXITY OF EARTHQUAKE PRECURSORS

In this paper the complexity of the short-term and impending earthquake precursors is studied with the anisotropic and quasi-elastic medium model and the source-composite model by using the finite-element numerical simulation. The result shows that the exhibitory degree depends on the closed degree of the observational site to the seismogenic structure. The closer the distance between the observational site and seismogenic structure, the more obvious the anomaly is. For the temporal distribution, the anomaly initially indicated the feature of anomaly propagation from the out-ring to the epicenter. In addition, the observations of the multiple techniques (multiple physical quantities) at same site often show obvious difference of the anomaly exhibition due to that the multiple physical quantities depend on the different variable factors during the seismogenic process.