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地震 ›› 2001, Vol. 21 ›› Issue (1): 33-38.

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连续形变观测的异常综合指数 SAD*

张雁滨, 蒋骏, 张燕, 李胜乐   

  1. 中国地震局地震研究所,湖北武汉 430071
  • 出版日期:2001-01-31 发布日期:2022-10-27
  • 作者简介:张雁滨(1958-),女,云南楚雄人,副研究员,主要从事形变、应变、固体潮理论的应用及地震预报研究。
  • 基金资助:
    地震科学联合基金重点项目(96-913-09-02-01-06)及(95-07-431)部分成果

The synthetical anomalous degree (SAD) of continuous deformation observation

ZHANG Yan-bin, JIANG Jun, ZHANG Yan, LI Sheng-le   

  1. Institute of seismogeology, CSB, Wuhan 430071, China
  • Online:2001-01-31 Published:2022-10-27

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摘要： 主要介绍了连续形变异常信息的综合指数SAD值的有关研究。在连续形变观测单项异常分析方法和参量研究的基础上,异常综合指数SAD较全面地综合了多种前兆参量和方法及同一测点的多台仪器观测信息,并顾及了不同台站之间的不同观测情况,所获得的结果较真实,更具可信度。可作为判定台站连续形变观测综合异常程度的判定值。此外,还对华北及川滇地区几次强震前SAD值的变化进行了分析。结果表明,强震前半年时段内,震区的连续形变观测点的SAD值会有一个显著增高(SAD值从平时的0.1～0.3的变化范围,增高到0.5以上)的前兆过程。特别是震中及邻近地区100多公里范围内的测点, SAD值出现显著的高值异常(达0.6以上),未来强震则发生在SAD值在0.6以上的分布地区。异常综合指数SAD值反映了监测区内与强震有关的连续形变前兆性异常程度和危险程度,可用于对未来强震的预测。但需要有合理的观测布局及一定的观测密度作为前提。

关键词: 连续形变, 异常综合, SAD值, 强震前兆

Abstract: In thispaper, the study of synthetical anomalous degree (SAC) was int roduced. The synthetical anomalous degree was synthesized ba sed on precurso ryparameters, methods and the informa tion of observ atio ns from many inst ruments. The result is quite true and credible thatit canbereg ardedas the judg ement to judge the anomalous level of the deforma tion. Furthermore, by analy zing the value of SAD before severalst rong earthquake in No rth and Southw est China regions, welearn tha tabo uthalfyear before the earthquake, the outstanding change of synthetical degree canbe observed (the value of SAD, ranges from 0.1 to 0.3 in usual exceeds 0.5) . Especially in epicent ral regio n and itsvicinity (in the sphere of more than 100 km) , the SAD risesto agreat highvalue (>0.6) . The st ro ng earthquakes alway shappen in the area with SAD exceeding 0.6 in the future. The synthetical anomalous degree can ref lect the level of the precurso ryanomaly and of strong earthquakes; itcan be used to predict the strong earthquakes. But it also needsappro priate dist ributio n and enough density of observation.

Key words: Continuous deformation, Synthetical anomaly, Value of SAD, Precurso rbeforestrong earthquake

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