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地震 ›› 1998, Vol. 18 ›› Issue (2): 184-188.

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体应变最大熵谱分析在江苏及邻区中强震的预报应用

李强   

  1. 中国南京 210014 江苏省地震局
  • 收稿日期:1997-06-03 修回日期:1997-09-04 出版日期:1998-04-30 发布日期:2022-05-10
  • 作者简介:李强,男,1958年11月出生,副研究员,1990年8月获硕士学位,主要从事测震学、应力应变学科的分析预报及科研工作。

APPLICATION OF MAXIMUM ENTROPY SPECTRAL ANALYSIS OF BODY-STRAIN IN PREDICTION OF MODER ATELY STRONG EARTHQUAKES IN JIANGSU PROVINCE AND ITS NEIGHBOURING REGION

Li Qiang   

  1. Seismological Bureau of Jiangsu Province, Nanjing 210014, China
  • Received:1997-06-03 Revised:1997-09-04 Online:1998-04-30 Published:2022-05-10

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摘要： 最大熵谱分析方法具有分辨率高、灵敏度和稳定性好等优点。 把它引用到应力应变学科中,为该学科在地震预报中开辟一条新路,也是对最大熵谱分析方法应用的推广。 选用了徐州台、溧阳台近年来的体应变观测资料, 着重研究了南黄海6.1级地震、 苍山5.2级地震和射阳4.6级地震。 研究结果表明,地震前的短临阶段体应变谱结构第一主频均有不同程度的衰减或增强,这种变化反映了地震前兆信息,因而可用于地震的短临预报。

关键词: 地震预报, 最大熵谱分析, 体应变, 前兆信息

Abstract: Maximum entropy spectral analysis has the merits of high resolution and sensibility as well as stability. The introduction of it into the discipline of stress-strain cannot only benefit the development of the earthquake prediction, but also the development of this method. With the observational body-strain data at Xuzhou and Liyang stations, we studied Yellow Sea earthquake (MS 6.1), Cangshan earthquake (MS 5.2) and Sheyang earthquake (MS 4.6). It is found that the strength of the first body-strain primary frequency appears attenuation or accretion in the stage of short-imminent term before the earthquakes. This variation indicates the information of earthquake precursors, and therefore it is applicable to the short-imminent earthquake prediction.

Key words: Earthquake prediction, Maximum entropy spectral analysis, Body strain, Precursor information