摘要
利用有限元方法,研究库水载荷产生的应力场及其在断层面上引起的静态库仑破裂应力变化。通过计算发现,库水载荷的加载位置对地震的触发作用有重要的影响:当库水加载于断层正上方或断层上盘时,对正断层型的地震有促进作用,对逆断层型的地震有抑制作用。但是,当库水载荷作用于断层的下盘时,对于倾角较大的正断层与逆断层地震,库水都起抑制作用;而对倾角很小的断层起促进作用,但不会产生很强的水库地震。
Using finite element method. The stresse field and the static Coulomb failure stress changes was calculated. The calculated results show that the location of the water impoundment plays an important role in triggering reservoir earthquake. When the reservoir water is loaded right over the fault and on the hanging wall of the fault, it will promote the earthquakes for normal faults and inhibit the seismicity for thrust faults. However, the earthquakes will all be inhibited both for normal and thrust faults with high dip angles when the load of reservoir water is located on the footwall of the faults. No strong reservoir-induced earthquakes will occur despite the load of water will promote the earthquake for the faults with small dip angles when the load is put on the footwall of the faults.
出处
《大地测量与地球动力学》
CSCD
北大核心
2010年第A01期17-21,25,共6页
Journal of Geodesy and Geodynamics
基金
国家自然科学基金(40974020
40774024)
北京市自然科学基金(8082024)
地震动力学国家重点实验室基金(LED2008B02)
关键词
水库地震
有限元
库水载荷
静态库仑应力变化
断层
reservoir-induced earthquake ： finite element model
load of reservoir water
static Coulomb failure stress change
fault
