The Great Luhuo Event ( M S=7 6) occurred on February 6, 1973 in Sichuan Province. There were a lot of aftershocks in the source area. The largest aftershock ( M S=6 3) occurred along a normal fault zone between the X...The Great Luhuo Event ( M S=7 6) occurred on February 6, 1973 in Sichuan Province. There were a lot of aftershocks in the source area. The largest aftershock ( M S=6 3) occurred along a normal fault zone between the Xianshuihe Fault and the Ganzi Yushu fault. Based on the focal mechanism solution, surface rupture, coseismic dislocation and seismo\|geological tectonics of the event, an elastic dislocation model of the Great Luhuo Event with a strike slip mechanism was designed and the Coulomb Failure Stress Change ( ΔCFS) in the slip direction on normal faults along and surrounding the source zone due to the event was calculated. The results showed that the largest aftershock occurred in an area with ΔCFS >0, and that ΔCFS =4 5MPa. Therefore, the largest aftershock was probably triggered by the Coulomb Failure Stress Change.展开更多
1研究背景地震活动断层不同区段和时段均具有不同的力学特性,主要是表现在活动断层上发生地震的断层段所呈现的震前、同震、震后和震间4个时域范围内的滑动行为。换言之,地震活动断层的滑动行为分为震前、同震、震后和震间4个滑动阶段...1研究背景地震活动断层不同区段和时段均具有不同的力学特性,主要是表现在活动断层上发生地震的断层段所呈现的震前、同震、震后和震间4个时域范围内的滑动行为。换言之,地震活动断层的滑动行为分为震前、同震、震后和震间4个滑动阶段。通过研究活动断层地震破裂段震前、同震、震后和震间滑动,可深入破解沿活动断层破裂段的应力、应变的积累和释放的时空信息变化(Reilinger et al,1999;Yagi et al,2001;Ozawa et al,2004)。展开更多
文摘The Great Luhuo Event ( M S=7 6) occurred on February 6, 1973 in Sichuan Province. There were a lot of aftershocks in the source area. The largest aftershock ( M S=6 3) occurred along a normal fault zone between the Xianshuihe Fault and the Ganzi Yushu fault. Based on the focal mechanism solution, surface rupture, coseismic dislocation and seismo\|geological tectonics of the event, an elastic dislocation model of the Great Luhuo Event with a strike slip mechanism was designed and the Coulomb Failure Stress Change ( ΔCFS) in the slip direction on normal faults along and surrounding the source zone due to the event was calculated. The results showed that the largest aftershock occurred in an area with ΔCFS >0, and that ΔCFS =4 5MPa. Therefore, the largest aftershock was probably triggered by the Coulomb Failure Stress Change.
文摘1研究背景地震活动断层不同区段和时段均具有不同的力学特性,主要是表现在活动断层上发生地震的断层段所呈现的震前、同震、震后和震间4个时域范围内的滑动行为。换言之,地震活动断层的滑动行为分为震前、同震、震后和震间4个滑动阶段。通过研究活动断层地震破裂段震前、同震、震后和震间滑动,可深入破解沿活动断层破裂段的应力、应变的积累和释放的时空信息变化(Reilinger et al,1999;Yagi et al,2001;Ozawa et al,2004)。
