摘要
2006年荣昌地区的地震活动显著活跃,发生有感地震9次,现场考察发现当地采气作业的废水注入状态有所改变。分析了注水和地震活动的关系,并从构造背景、震源机制解等方面讨论了荣昌地震的可能机制,认为荣昌地区5.0级左右破坏性地震的发生受四川盆地区域应力场控制,人为注水引发的频繁小震活动改变了局部渗流和孔隙压,促使裂隙扩张并导致大破裂产生。
The seismic activity in Rongchang quakes occurred. The investigation on earthquake area of Chongqing in 2006 was remarkable and nine felt earthsites discovered that the condition of the waste water pours had changed. The relation of poured water with the seismic activity is analyzed, and the possible focal development pattern of the Rongchang earthquake is discussed from the tectonic background, the focal machanism solution and so on. It is considered that the seismogenic model of Rongchang destructive earthquake （ about Ms5. 0） is controled by the local stress field in Sichuan basin. The poured water causes frequent small earthquakes and changes the partial infiltration and the pore pressure, finally causes the crack to expand and the rupture to occur.
出处
《大地测量与地球动力学》
CSCD
北大核心
2007年第6期86-90,共5页
Journal of Geodesy and Geodynamics
基金
"十一五"国家科技支撑计划"强震监测预报与预警技术研究"项目子专题"西南构造区强震预测预警技术和指标"(2006BAC01B02-01-01)
关键词
注水地震
孕震模式
华蓥山基底断裂
孔隙压
荣昌地区
fluid-injection induced earthquake, seismogenic model, Huayingshan basement fault, pore water pressure, Rongchang area
