华北地区强震的背景地震活动性的研究
A STUDY OF BACKGROUND SEISMICTY OF STRONG EARTHQUAKES IN NORTH CHINA
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摘要: 7级以上的强震并不是在一片空白上突然发生的,而是在一种间歇性的地震活动背景下发生的,研究这种背景地震活动的规律,为判定一个活动期的强震的潜在震源区提供信息。本文通过对华北历史上记录到的18次7级以上强震的震前史和震后史的研究,提出了华北地区强震背景地震活动的四条规律:①强震前多有6级以上的背景地震发生;②并且多有信息地震发生;③短时间近距离的两个强震之间可能出现缓震现象;④强震具有一定的减震作用。文中根据这四条规律,对华北地区1501——1730年的强震潜在震源区做了判别分析。Abstract: Strong earthquakes with magnitude M7 do not occur in quiet places,but in areas with a certain seismic background. Study of the rules of the background seismicity may provide information for judging the potential areas of seismic sources of strong earthquakes. This paper deals with eighteen earthquakes with magnitude M7 in North China,studies the seismic activities before and after each of these large shocks,and proposes four rules for background seismicity of strong earthquakes in North China:1. Before a strong earthquake there are always background earthquakes whose magnitude is larger than six (M6). 2.There are informative (signal) earthquakes which occur before the main shock.3.A phenomenon of seismic postponing exists between two strong earthquakes whose epicenters and occurrence times are close to each other.4.A strong earthquake can reduce the seismic activity of its vicinity. Based on these four rules this paper judges the potential areas of seismic sources of strong earthquakes for the period A. D. 1500-1730 in North China.
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[2] 顾功叙、林庭煌、时振粱、李群、武焕英、卢寿德、杨玉林,1983.中国地震目录.科学出版社.
[3] 中国科学院地震工作委员会历史组编辑,1956.中国地震资料年表,316——347.科学出版社.
[4] 章淮鲁、何淑韵,1989.华北历史地震的周期分析.华北和南北地震带近期地震危险性判定研究.地震出版社,待出版.
[5] 谢毓寿、蔡美彪、章伯锋、闻少华、社洽、赵云侠,1985.中国地震历史资料汇编,第二卷,p88.科学出版社.
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