Dynamic Coulomb failure stress changes caused by significant earthquakes in Jiujiang-Ruichang region
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摘要: 为了探究九江—瑞昌地区内的地震活动是否存在动态应力触发关系，本文选用多层黏弹性介质模型，计算了2005年九江—瑞昌MS5.7地震和2011年瑞昌—阳新MS4.6地震产生的动态库仑破裂应力变化。结果显示：九江—瑞昌MS5.7地震产生的动态库仑破裂应力变化，能触发其北东方向的53次地震；瑞昌—阳新MS4.6地震发生后15天内，小震活动增强区及九江—瑞昌MS5.7地震震源区的多次地震活动，可能与其动态应力触发作用有关。
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关键词:
- 九江-瑞昌MS5.7地震 /
- 瑞昌—阳新MS4.6地震 /
- 动态库仑破裂应力变化 /
- 应力触发
Abstract: In order to explore whether there was a dynamic stress trigger relationship between seismic activities in Jiujiang-Ruichang region, this paper calculated the dynamic Coulomb failure stress （CFS） changes caused by the 2005 MS5.7 Jiujiang-Ruichang earthquake and 2011 MS4.6 Ruichang-Yangxin earthquake based on the multi-layer viscoelastic medium model. The results show that the dynamic CFS changes caused by the Jiujiang-Ruichang MS5.7 earthquake had a triggering effect on the occurrence of 53 earthquakes in the northeast direction. Within 15 days after the occurrence of the Ruichang-Yangxin MS4.6 earthquake, the multiple events in the triggered region and the source region of the Jiujiang-Ruichang MS5.7 earthquake were all subjected to the triggering effect of dynamic CFS change caused by the MS4.6 earthquake. -
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图 1 九江—瑞昌地区主要断裂构造与地震活动图像
区域A表示九江—瑞昌MS5.7地震震中及邻域；区域B表示研究区北东方向发生的53次地震；区域C表示瑞昌—阳新MS4.6地震震中及邻域；区域D为小震活动增强区
Figure 1. Main fault structures and seismic activity images in Jiujiang-Ruichang area
The area A is the epicenter of Jiujiang-Ruichang MS5.7 earthquake and its vicinity，B is the location of the 53 events in NE direction，C is the epicenter of Ruichang-Yangxin MS4.6 earthquake and its vicinity，and D is the triggered area
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图 2 九江—瑞昌MS5.7地震产生的ΔCFS动态演化
Figure 2. Dynamic evolution of ΔCFS generated by the Jiujiang-Ruichang MS5.7 earthquake
（a） t＝3 s；（b） t＝4 s；（c） t＝5 s；（d） t＝7 s；（e） t＝9 s；（f） t＝10 s；（g） t＝12 s；（h） t＝13 s；（i） t＝14 s；（j） t＝16 s；（k） t＝20 s；（l） t＝25 s
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图 3 瑞昌—阳新MS4.6地震产生的ΔCFS动态演化
Figure 3. Dynamic evolution of ΔCFS generated by Ruichang-Yangxin MS4.6 earthquake
（a） t＝3 s；（b） t＝4 s；（c） t＝5 s；（d） t＝6 s；（e） t＝9 s；（f） t＝10 s；（g） t＝11 s；（h） t＝12 s；（i） t＝13 s；（j） t＝14 s；（k） t＝20 s；（l） t＝25 s
表 1 九江—瑞昌MS5.7地震和瑞昌—阳新MS4.6地震的断层参数
Table 1 Fault parameters of Jiujiang-Ruichang MS5.7 earthquake and Ruichang-Yangxin MS4.6 earthquake
MS 断层上沿深度/km 断层下沿深度/km 震源深度/km 走向/° 倾角/° 滑动角/° 断层破裂长度/km 滑动量/m 5.7 8.0 14 11.0 324 55 18 6.0 0.26 4.6 3.1 10 9.6 205.9 67.48 159.64 5.6 0.24 
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