The Coulomb Stress Change Associated with the Taiwan Straits M_S 7.3 Earthquake on September 16,1994 and the Risk Prediction of Its Surrounding Faults  

作　　者：Wang Shaowen Zhan Wenhuan Zhang Fan Zhu Junjiang 

机构地区：[1]Key Laboratory of Marginal Sea Geology, South China Sea Institute of Oceanology [2]Graduate University of Chinese Academy of Sciences

出　　处：《Earthquake Research in China》2013年第1期77-90,共14页中国地震研究（英文版）

基　　金：sponsored jointly by the National Natural Science Foundation of China(U0933006),National Natural Science Foundation of China(41006030,41176054);the Special Research Program(908Program)of Guangdong Province(GD908-JC-03,GD908-JC-10)

摘　　要：Using the focal mechanism solutions and slip distribution model data of the Taiwan Straits MS7.3 earthquake on September 16, 1994, we calculate the static Coulomb stress changes stemming from the earthquake. Based on the distribution of aftershocks and stress field, as well as the location of historical earthquakes, we analyze the Coulomb stress change triggered by the Taiwan Straits MS7.3 earthquake. The result shows that the static Coulomb stress change obtained by forward modeling based on the slip distribution model is quite consistent with the location of aftershocks in the areas far away from the epicenter. Ninety percent of aftershocks occurred in the stress increased areas. The Coulomb stress change is not entirely consistent with the distribution of aftershocks near the epicenter. It is found that Coulomb stress change can better reflect the aftershock distribution far away from the epicenter, while such corresponding relationship becomes quite complex near the epicenter. Through the calculation of the Coulomb stress change, we find that the stress increases in the southwest part of the Min-Yue (Fujian-Guangdong) coastal fault zone, which enhances the seismic activity. Therefore, it is deemed that the sea area between Nanpeng Island and Dongshan Island, where the Min-Yue coastal fault zone intersects with the NW-trending Shanghang-Dongshan fault, has a high seismic risk.Using the focal mechanism solutions and slip distribution model data of the Taiwan Straits Ms7. 3 earthquake on September 16, 1994, we calculate the static Coulomb stress changes stemming from the earthquake. Based on the distribution of aftershocks and stress field, as well as the location of historical earthquakes, we analyze the Coulomb stress change triggered by the Taiwan Straits Ms 7. 3 earthquake. The result shows that the static Coulomb stress change obtained by forward modeling based on the slip distribution model is quite consistent with the location of aftershocks in the areas far away from the epicenter. Ninety percent of aftershocks occurred in the stress increased areas. The Coulomb stress change is not entirely consistent with the distribution of aftershocks near the epicenter. It is found that Coulomb stress change can better reflect the aftershock distribution far away from the epicenter, while such corresponding relationship becomes quite complex near the epicenter. Through the calculation of the Coulomb stress change, we find that the stress increases in the southwest part of the Min-Yue （Fujian-Guangdong） coastal fault zone, which enhances the seismic activity. Therefore, it is deemed that the sea area between Nanpeng Island and Dongshan Island, where the Min-Yue coastal fault zone intersects with the NW-trending Shanghang-Dongshan fault, has a high seismic risk.

关 键 词：Coulomb stress change The Taiwan Straits Ms 7. 3 earthquake Focalmechanism solution Seismic risk of fault 

分 类 号：P315.1[天文地球—地震学]