2014年新疆于田MS7.3地震近断层 强地面运动模拟及烈度分布估计

分析了2014年于田M_S7.3地震的震源参数特征； 结合已有的震源机制反演结果， 选取断层面上滑动位移分布构建有限断层模型， 模拟计算了近断层区域的宽频带强地面运动参数， 并基于强地面运动模拟结果估算了该地震的模拟烈度分布. 模拟结果表明， 于田M_S7.3地震极震区的模拟烈度达到Ⅸ度， 与中国地震局公布的烈度图趋于一致， 相对于美国地质调查局公布的震动图中极震区烈度(Ⅶ—Ⅷ)偏大. 此外文中给出的烈度Ⅶ度及以上影响范围与中国地震局公布的地震动图较为一致. 

Estimation of near-fault strong ground motion and intensity distribution of the 2014 Yutian,Xinjiang, MS7.3 earthquake

The February 12, 2014, M_S 7.3, Yutian earthquake of Xinjing Uygur Autonomous Region, China, occurred as a result of shallow strike-slip faulting in the tectonically complex region of the northern Tibetan Plateau, with focal depth of 17 km. This earthquake occurred several hundred kilometers north of the convergent India-Eurasia Plate boundary. The location of Yutian earthquake is 110 km north of Yutian County, Hetian region. The maximum intensity is up to Ⅸ in the near-fault field shown in the ShakeMap from the China Earthquake Administration (CEA), which is different from the result from USGS. In this study, we analyzed the source parameters and studied the effect of slip distribution on the fault plane. One finite fault source model was constructed and the strong ground motions, including acceleration and velocity, were calculated. Based on the simulation of the near-fault strong ground motion, we described the intensity distribution of the Yutian earthquake. The maximum simulated intensity, Ⅸ, is consistent with the results from the CEA, but higher than that from USGS (Ⅶ—Ⅷ). In fact, the numerical modeling developed in this study has great application in the strong ground motion prediction and intensity estimation for the earthquake rescue.