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地震 ›› 2004, Vol. 24 ›› Issue (1): 126-131.

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中国大陆7级强震前地下流体前兆时空特征

晏锐, 黄辅琼, 顾瑾平   

  1. 中国地震局分析预报中心, 北京 100036
  • 出版日期:2004-01-31 发布日期:2021-11-29
  • 作者简介:晏锐(1978-), 男, 云南宣威人, 助理研究员, 主要从事地下流体资料处理、 地震预测等研究。
  • 基金资助:
    “十五”国家科技攻关项目(15-01-05-06)和中国地震局分析预报中心地震应急研究专题联合资助

Spatial-temporal characteristics of precursory anomaly of underground fluid before MS7.0 strong earthquakes in China's continent

YAN Rui, HUANG Fu-qiong, GU Jin-ping   

  1. Center for Analysis and Prediction, CSB, Beijing 100036, China
  • Online:2004-01-31 Published:2021-11-29

摘要: 对中国大陆1969年以来11次7级强震前地下流体前兆观测资料分阶段进行统计分析, 并选用雷达图描述了中国大陆7级强震前地下流体前兆异常的时空特征, 认为其特征主要表现在: 异常出现时间上的阶段性与不均匀性, 中长期趋势性异常分散, 短临异常相对集中, 且各占总异常比例的50%左右; 震前异常集中在一定的范围内, 并沿活动断裂呈现出一定的集中性; 中长期趋势异常较早出现在震源区附近, 并呈现出由震源区向外围扩散-收缩-扩散-收缩的过程, 特别是进入短临阶段后, 异常向震源区收缩的趋势更为明显; 在震源区(或在距震源较近的范围内)异常所占的比例大, 远离震源区所占比例小, 且有由震源区向外围逐渐减小的趋势。

关键词: 7级强震, 地下流体, 前兆异常, 震源区, 雷达图

Abstract: Precursory data of underground fluid before 11 MS7.0 strong earthquakes since 1969 in China's continent were analyzed in this article. Spatial-temporal characteristics of precursory anomaly of underground fluid before MS7.0 strong earthquakes were described by using radar and statistical diagram. The result indicates that: ① The anomalies show periodical characteristics and ununiformity in time. The mid-long-term anomalies are dispersing, short-term and impending anomalies are relatively concentrated, each anomaly roughly accounts for 50%. ② The anomalies are concentrated in a certain area and distributed along the active faults. ③ The mid-long-term anomalies appear around the earthquake source region in the earliest stage and show the process of diffusion-concentration-diffusion-concentration, and especially when enter the short-impending stage this concentrating trend becomes more apparent. ④ The percentage of the anomalies in the earthquake source region is larger than that far from the earthquake source region. That is to say: There is a trend that the percentage of the anomalies gets more and more small when the distance is farther from the earthquake source region.

Key words: MS7.0 strong earthquake, Ground fluid, Precursor anomaly, Earthquake source region, Radar diagram

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