2022年1月8日青海门源6.9级强地震动模拟研究

Strong ground motion simulation of the Qinghai M 6.9 earthquake on January 8,2022

为满足数字化时代应急处置的新要求,基于随机有限断层法的发展,利用青海门源地区地下三维速度结构的模型和v S30数据,通过逐步迭代射线追踪法、格林函数位移解析相位谱和有限断层法的联合计算,以青海门源6.9级地震为例,获得具有地表土层放大效应的强地震动模拟数据,进而绘制出研究区内PGA和烈度分布模拟图;并与实际台站记录的PGA和实地调查烈度结果相比,其烈度区划范围基本一致,同时也验证此联合计算方法可用于未来地震灾害的快速评估,并为灾后应急救援提供参考。

To address the modern requirements of emergency response efforts in the digital age,we developed an approach based on the stochastic finite fault method.Specifically,utilizing an underground three-dimensional velocity structure model and v S30 data from the Menyuan region of the Qinghai Province,we applied the step-by-step iterative ray-tracing method,phase spectrum of Green's function displacement analytical solution,and finite fault method to record strong ground motion simulation data incorporating ground surface amplification effects.Furthermore,considering the Menyuan M 6.9 earthquake that struck the Qinghai Province on January 8,2022,we created simulation maps depicting the peak ground acceleration(PGA)and intensity distributions within the study area.Subsequently,comparing the simulated results with actual PGA records from monitoring stations and field survey intensity data revealed consistent intensity zonation scopes.Moreover,these results validated the utility of the proposed method for rapid assessments of future earthquake disasters,offering valuable insights for postdisaster emergency rescue efforts.