摘要
本文根据新疆120年的地震资料,分析了北天山地区地震活动特征。本区地震活动有A、B两大活动期和b、c、d、e四个活动段,每个活动段间隔约16~20年。地震活动主要集中在“两带一区”,它们各有自己的地震活动特点,较大地震有地震活动显著增强→地震活动相对减弱→震前平静→发震→震后平静的发展过程;还发现震前数年有孕震空区(或空段)出现,震前数月地震活动有异常条带分布的趋向。增强的地震活动往往呈丛集分布。该区有两个地震活动的“敏感”区域。认识这些地震活动特性,对我们分析新疆地区的地震活动,研究大震的预报问题都有实际意义。
According to the seismic data of Xinjiang for about 120 years,the characteristics of the seismicity in the northern Tian-shan mountains have been analysed.The seismic activity of this area may be divided into two active periods of A and B and four active time segments of b,c,d and e.The interval between every two active time segments is about 16-20 years 0The seismic activities are mainly distributed along the"two belts and one area"and each of them has own characterise.There is a development process of great increase in seismicity-relative decrease in seismicity-silence before an earthquake-occurence of main earthquake-silence again after earthquakes.Seismic gaps often appear several years before main earthquakes,and seismicity tends to be distributed along a narrow belt several months before main earthquakes.The increased seismic activities are usul-ly concentrated.There are two"sensitive area of seismic activity in that area.lt is significant to know these characteristics for the analyse of the seismicity in Xinjiang and the study of great earthquake prediction.
作者
王盛泽
Wang Shenze(Seismological Bureau of Xinjiang Uygur Autonomous Region)
出处
《内陆地震》
1987年第1期32-42,共11页
Inland Earthquake
