渤海地震序列及其特征 |
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引用本文: | 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 |
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作者姓名: | 魏光兴 季同仁 李秉锋 |
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作者单位: | 山东省地震局(魏光兴,季同仁),山东省地震局(李秉锋) |
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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
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关 键 词: | 地震序列 余震衰减 渤海地震 渤海地区 海城地震 余震序列 震源机制解 北北东向 空间分布 震源断层 |
CHARACTERISTICS OF MAGNITUDE 7.4 EARTHQUAKE SEQUENCE IN THE BOHAI AREA |
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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 |
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