摘要
引言 我国是一个多地震的国家,有较丰富的历史地震资料。公元前1831年即有地震记述。自宋、元以来(约十二世纪),地方志逐渐盛行,特别是明代以后(公元1368年),地震记载较为普遍与详细,不仅记有强震破坏,而且对远震波及与当地的弱震情况都有所描述,甚至一些抗震经验也有所涉及。
In this paper we have made a statistical analysis of more than a thousand destructive earthquakes which occurred throughout China,since 1000 A.D.We have examined!certain characteristics of the distributions in time,and space and of the intensities of these strong shocks.The whole country is first divided into 23 seismic zones,each of which being regarded as a single unit in which the processes of strain accumulation and release are taking place.It is found that strong seismic activities in the same zone were always concentrated in some periods,while others were of comparative quiescence.The whole duration from the time of comparative quiescence to that of high activity may be regarded as a single process of strain accumulation and release which again may be divided into four stages.The first stage is that of strain accumulation.This is followed by the stage of accelerating strain release.Then comes the stage of rapid release in which the strain accumulated is almost wholly released.The whole course of activity is completed by the stage of remnant release.In the stage of rapid release,the strain accumulated in some of the seismic zones is released through a single major shock but in others,through several shocks of lower magnitudes.The former is called the type of single major shock and the latter,the type of multiple major shocks.As a statistical result of various seismic zones,the total strain release of this stage appears to be of a certain limited value.In the seismic zones of China,one period of seismic activity may last a few hundred,or even a thousand years,maximum magnitude of earthquakes which occurred in various stages may vary a great deal.Therefore,in seismic regionalization,the activity should not be regarded as a stationary process.The stage to which the activity belongs must be taken into consideration.This will be helpful in obtaining a better estimate of the seismicity and the tendency of earthquake occurrence.
作者
时振梁
环文林
曹新玲
武宦英
刘耀斌
黄玮琼
SHIH CHEN-LIANG;HUAN WEN-LIN;TSAO HSIN-LING;WU HUAN-YING;LIU YAO-PIN;HUANG WEI-KING(Institute of Geophysics,Academia Sinica)
出处
《地球物理学报》
1974年第1期1-13,共13页
Chinese Journal of Geophysics
