许昌地区历史地震统计分析
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摘要
对许昌市1000年以来的地震记录进行统计分析后,发现许昌地区的地震具有震群型地震和孤立型大震相间分布的特点,地震活跃期一般持续4～20年左右。地震平静期为60年的倍数,即大震发生的周期为120年,地震发生的位置多分布在许昌市的东南、东北10km的范围之内,引发地震的活动断裂为开封—汝南深大断裂和许—禹断裂。
After studying the records of the historical earthquakes in Xuchang,a fact is found that there is an interval between groups of small earthquakes during which big earthquakes take place. The active period usually lasts about 4 ~ 20 years and the peaceful interval is about 60 years and its multiple,that is,the big earthquakes take place in a circle of 120 years, 180 years or so.Locations of the earthquakes are mainly in Northeast of Xuchang in 10 km distance area. A main zone of fractures which makes those earthquakes occure are Kaifeng-Runan fracture and Xuchang-Yuxian fracture.
After studying the records of the historical earthquakes in Xuchang,a fact is found that there is an interval between groups of small earthquakes during which big earthquakes take place. The active period usually lasts about 4 ~ 20 years and the peaceful interval is about 60 years and its multiple,that is,the big earthquakes take place in a circle of 120 years, 180 years or so.Locations of the earthquakes are mainly in Northeast of Xuchang in 10 km distance area. A main zone of fractures which makes those earthquakes occure are Kaifeng-Runan fracture and Xuchang-Yuxian fracture.
引文
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[2] 马宗晋.地震与断层关系的讨论(中国活动断裂)[C].北京:地震出版社,1982．
[3] 河南省地矿厅.河南省境内淮河流域旱涝灾害成因与治理[M].北京:地质出版社,1991．
[4] 张立汉.河南省历史地震研究[J].许昌师专学报(自然科学版),1991,(4) .
[5] 宋春青,张阵泰.地质学基础[M].北京:人民教育出版社,1978．
[6] 国家地震局.中国地震简目[M].北京:地震出版社,1977．
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