华北地区断层现今活动速率与特征
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摘要
系统分析了华北地区跨断层形变资料，计算了断层活动平均速率，研究了断层活动年变率的动态演化。结果表明，华北地区现今断层活动水平较低，平均速率为０．１７ｍｍ／ａ；山西—延怀地区断层活动水平高于华北地区平均水平；山西带及郯庐带北端活动速率呈上升趋势，这与现今及近期的地震活动有密切关系；强烈地震发生前，存在大范围断层活动平均速率的增加；大范围断层活动方式的转折，可能是地震活动分期的重要标志之一。
In this paper we have analyzed the data of mobile geodetic deformation across faults in North China, calculated average rates of fault movement, studied dynamic evolution of annual variation of fault movement. The results show that the recent fault movement rate is small in North China and the average rate is 0.17mm/a. Fault movement rate in Shanxi Yanhuai area is faster than average rate in North China. Movement rates tend to rise in Shanxi belt and North Tanlu belt , which have close relation with seismic activity in recent time. Rates of fault movement have increased before strong earthquakes in large extent. Turning of fault movement manner in macroscopic may be one of the important signs ploting out period of seicmic activity.
In this paper we have analyzed the data of mobile geodetic deformation across faults in North China, calculated average rates of fault movement, studied dynamic evolution of annual variation of fault movement. The results show that the recent fault movement rate is small in North China and the average rate is 0.17mm/a. Fault movement rate in Shanxi Yanhuai area is faster than average rate in North China. Movement rates tend to rise in Shanxi belt and North Tanlu belt , which have close relation with seismic activity in recent time. Rates of fault movement have increased before strong earthquakes in large extent. Turning of fault movement manner in macroscopic may be one of the important signs ploting out period of seicmic activity.
引文
车兆宏．1993．首都圈断层活动性研究．华北地震科学，11（2）：23～34．丁国瑜．1984．中国的活断层．见：国家地震局科技监测司编．大陆地震活动和地震预报国际学术讨论会论文集．北京：地震出版社．149～163．马廷著，刘光勋，黄佩玉，等．1991．活动断裂及其现代运动．见：丁国瑜主编．中国岩石圈动力学概论．北京：地震出版社．106～116
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