鲁甸地震发震断层自发破裂模拟

Simulation of Spontaneous Rupture of the Seismogenic fault of Ludian Earthquake

从弹性动力学方程出发模拟了鲁甸地震在包谷垴—小河断裂地震自发破裂过程,探讨影响鲁甸地震破裂的因素。研究结果表明:鲁甸地震的左旋走滑的震源机制以及震级主要是受背景应力场的影响,断层滑移分布受到断层几何结构、水平应力场方向及相对大小的影响,非平面复杂断层几何结构是导致鲁甸地震复杂的滑动位移分布的原因。

In this study,we simulate the process of spontaneous rupture of the Ludian earthquake at Baogunao-Xiaohe fault,and discuss the influencing factors of the Ludian earthquake rupture. The results show that the focal mechanism of the left-lateral strike-slip and the magnitude of the Ludian earthquake are mainly affected by the background stress field. The distribution of fault slip is affected by the change of fault geometry,direction and relative size of horizontal stress field. Non-planar complex fault geometry structure causes the complex sliding displacement distribution of the Ludian earthquake.