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地震 ›› 2016, Vol. 36 ›› Issue (3): 116-124.

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华东南地区5.5级以上地震前的地震活动图像异常研究

曾新福, 吕坚   

  1. 江西省地震局, 江西 南昌 330039
  • 收稿日期:2015-11-10 发布日期:2020-07-03
  • 作者简介:曾新福(1979-), 男, 江西于都人, 工程师, 主要从事地震地质研究。
  • 基金资助:
    地震科技星火计划项目(XH16023)资助

Anomalous Patterns of Seismic Acitivity before MS≥5.5 Earthquakes in Southeastern China

ZENG Xin-Fu, LU Jian   

  1. Earthquake Administration of Jiangxi Province, Nanchang 330039, China
  • Received:2015-11-10 Published:2020-07-03

摘要: 对华东南地区1970年以来5.5级以上地震前的地震活动空间图像进行了分析, 发现震前多有不同程度的地震条带、 空区或增强异常出现。 所研究的9次地震中, 有4次震前出现了地震条带异常, 3次出现了地震空区异常, 4次出现了地震活动增强, 出现2种以上异常的地震有4次。 条带、 空区与主震的相对位置表明, 主震发生在条带内部的比例与边缘及外侧相当, 主震全部发生在空区内部。 条带、 空区相对于发震断层走向的角差小于30°的比例分别为33%和60%。

关键词: 地震活动图像, 地震空区, 地震条带, 增强, 华东南地区

Abstract: Seismic activity patterns before MS≥5.5 earthquakes in the southeastern China since 1970 are analyzed. It is found that varying degrees of seismic strips, gaps and enhancements have been found before the earthquakes There are four strips, three gaps and four enhancements appeared out of nine events, and more than two kinds of anomalies appeared before the four mainshocks. Relative positions of strips, gaps and mainshocks show that the ratio of mainshocks located in the strip is equivalent to the margins or outside,and the mainshocks are all located in the gap. The ratio of angle between strip, gap and causative fault strike within 30° is 33% and 60% respectively.

Key words: Earthquake activity pattern, Seismic gap, Seismic strip, Southeastern China

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