渤海地震序列及其特征

地震地质 ›› 1984, Vol. 6 ›› Issue (1): 21-29.

渤海地震序列及其特征

魏光兴, 季同仁, 李秉锋

山东省地震局

收稿日期:1982-09-30 出版日期:1984-03-07 发布日期:2009-11-25

CHARACTERISTICS OF MAGNITUDE 7.4 EARTHQUAKE SEQUENCE IN THE BOHAI AREA

Wei Guangxing, Ji Tongren, Li Bingfeng

Seismological Bureau of Shandong Province

Received:1982-09-30 Online:1984-03-07 Published:2009-11-25

摘要/Abstract

摘要： 1969年7月18日渤海海域(北纬38°20′,东经119°27′)发生7.4级地震,属主震-余震型。区域地震活动分析表明,主震前出现小震条带、b值低等异常现象。研究重新校订的余震目录资料,发现余震空间分布具有随时间由横向集中、垂向扩散到横向扩散、垂向集中的过程,及b值高、P值大等特点。另外,对于渤海地震与1975年海城7.3级地震的同异点等问题进行了讨论。

Abstract: The Bohai earthquake (M=7.4,38°20′N,119°27′E) occurring on July 18,1969 is typical of a main-aftershock.Analyses of regional seismicity indicate some anomalous variations,such as b-value decrease and belt-shaped distribution and so forth.Based upon detailed study for revised aftershock data,we have found characterized spatial distribution of aftershocks from lateral cluster,vertical diffusion to lateral one,vertical cluster,b-value decreasing and p-value high,and the like.Also discussed in this paper are some details about Bohai earthquake and M=7.3 Haicheng earthquake of 1975.

魏光兴, 季同仁, 李秉锋. 渤海地震序列及其特征[J]. 地震地质, 1984, 6(1): 21-29.

Wei Guangxing, Ji Tongren, Li Bingfeng. CHARACTERISTICS OF MAGNITUDE 7.4 EARTHQUAKE SEQUENCE IN THE BOHAI AREA[J]. SEISMOLOGY AND GEOLOGY, 1984, 6(1): 21-29.