基于NNSIM随机有限断层法的7.0级九寨沟地震强地面运动场重建

北京时间2017年8月8日21时19分在四川阿坝州九寨沟县（北纬33.2°、东经103.8°）发生了7.0级地震，作者利用新提出的震源破裂过程控制的NNSIM随机有限断层方法，对震中约100 km范围内强地面运动进行了情景构建，并与研究区范围内的8个强震测震台观测记录进行了加速度、速度、反应谱对比，对比的一致性说明模拟过程中所应用的各种震源参数适合九寨沟7.0地震的近震源强地面运动重建.论文的后半部分基于相同参数模拟了九寨沟7.0级地震的近震源强地面运动场的空间分布，结果显示此次地震强地面运动的PGA、PGV以及反应谱分布均呈现出以震中为圆心的圆形分布，不具有大地震沿断层走向的分布特点.论文最后关于反应谱的讨论，揭示了此次九寨沟县城灾害不重的直接原因.

Reconstruction of strong ground motion of Jiuzhaigou M7.0 Earthquake based on NNSIM stochastic finite fault method

An M_S7.0 earthquake occurred at Jiuzhaigou County of Aba Prefecture in Sichuan province at 21∶19 on August 8, 2017 with the epicenter at (33.2°N,103.8°E). This paper reconstructed the ground motion in 100 km from the epicenter by NNSIM stochastic finite fault method. The acceleration records, the velocity records, and the response spectrum at eight observation stations in the area were simulated. And their comparisons with observed records illustrated good agreements which mean that the adopted source parameters are suitable to simulation. In the later part of the paper the space distribution of ground motion was calculated with the same source parameters, which shows that the PGA, PGV and PSA appear as a circle type around the epicenter. Obviously circle shape is close to the space-distribution of small earthquakes and different from strike-distribution shape of large earthquake. Lastly in the discussion section of PSA, the small PSA value shows the direct reason why Jiuzhaigou 7.0 Earthquake induced light damages.