玛多MW7.3地震同震滑动分布的三维有限元模拟分析

首次构建2021年玛多M_W7.3地震三维有限元模型，分析同震滑动分布特征。首先解算高精度GNSS同震形变观测数据；然后建立玛多地震三维有限元模型，并用弹性半空间Okada模型验证其准确性；最后以40个近场和远场GNSS同震形变观测数据为约束，利用最小二乘法反演玛多地震同震滑动分布模型，从而模拟同震位移。结果表明，玛多地震引起的破裂主要分布在野马滩和黄河乡附近，最大滑动值约为3.4 m。该结果与现场考察结果一致，能够很好地解释GNSS同震形变观测数据。

Three-Dimensional Finite Element Simulation Analysis of Coseismic Slip Distribution of Madoi MW7.3 Earthquake

For the first time, we construct a three-dimensional finite element model for the 2021 Madoi M_W7.3 earthquake to analyze the features of coseismic slip distribution. First, we process the high-precision GNSS coseismic deformation observations. Then, we construct a three-dimensional finite element model, which is validated by the elastic half-space Okada model. Finally, we invert the coseismic slip distribution model of the Madoi earthquake using the least squares method, by constraining 40 near-field and far-field GNSS coseismic displacement observations. The results show that the Madoi earthquake reptures with a maximum value of about 3.4 m are mainly distributed near the area of Yematan and Huanghe country. The results are consistent with the field investigation and can well explain the GNSS coseismic deformation observations.