地震地质 ›› 1997, Vol. 19 ›› Issue (1): 37-42.

• 科研简报 • 上一篇    下一篇

华北地区大震前区域地震活动的中短期变化

林怀存, 刘希强   

  1. 山东省地震局, 济南, 250021
  • 收稿日期:1996-02-29 修回日期:1996-10-31 出版日期:1997-03-05 发布日期:2009-11-25

MEDIUM AND SHORT TERM CHANGES OF REGIONAL SEISMICITY BEFORE MAJOR EARTHQUAKES IN NORTH CHINA

Lin Huaicun, Liu Xiqiang   

  1. Seismological Bureau of Shandong Province, Jinan 250021
  • Received:1996-02-29 Revised:1996-10-31 Online:1997-03-05 Published:2009-11-25

摘要: 对发生在华北地区31个M≥5地震震前区域地震活动的时间序列进行的研究得出:(1)华北地区发生M≥5地震前,区域地震活动的短期平静现象与大震发生的相关性很强。31个M≥5地震前的平静时间主要集中在20~87d,120~210d和大于210d.同时还得出大震前的短期平静时间与震级大小无关的结论;(2)区域地震活动在短时间内出现增强趋势,与发生大震的相关性很弱,相关的仅占总数的6.4%。

关键词: 区域地震活动性, 地震平静, 时间序列, 短期预报, 华北

Abstract: We have studied the time sequences of regional earthquakes before 31 events of MS≥5 in North China. It is suggested that the correlation between the short term quietude and major earthquakes is strong for the events of M≥5 in North China. To the 31 events of M≥5 such quiet time durations are dominated by 20~87d,120~210d,and more than 210d. It is also concluded that the short term quietude does not depend on the magnitude of following major events. On the other hand the correlation between the increasing trend in short time of regional seismicity and major events seems to be weak. The events which are correlated with such a change is only 6.4% of the total number of the major earthquakes.

Key words: Regional seismicity, Seismic quiet, Time sequence, Short-term earthquake prediction, North China