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

作者：Zhou Hong^*

来源：Acta Geophysica Sinica, 2018, 61(5): 2111-2121.

DOI：10.6038/cjg2018L0651

• NNSIM stochastic finite fault method
• Strong ground motion
• Rupture process of fault
• The corner frequency

An M(s)7. 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 degrees N,103. 8 degrees 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.

• 出版日期2018-5
• 单位中国地震局