| 基于单键群方法的地震前兆时空群集特征研究 |
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| 引用本文： | 刘希强,周蕙兰,王梅,王华林.基于单键群方法的地震前兆时空群集特征研究[J].西北地震学报,2001,23(1):13-20. |
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| 作者姓名： | 刘希强 周蕙兰 王梅 王华林 |
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| 作者单位： | 1. 山东省地震局,
2. 中国科学技术大学研究生院, |
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| 基金项目： | 国家自然科学基金资助项目(49674214)；地震科学联合基金资助项目(197034) |
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| 摘 要： | 利用单键群分析方法，对1976年唐山和1989年大同地震前多学科前兆异常的时空群集特征进行了研究。对2次地震前兆的单键群构架的信源熵、平均键长和累积滑动频次进行了时空扫描。结果表明，地震前单键群要异常非常明显，并且可以分为5个阶段。1975年6月－1976年6月（第4阶段）异常幅度变化最大。震前1个月（第5阶段）信源熵值进一步下降，平均键长变化维持在第4阶段的水平，累积滑动频次增加。异常的变化阶段可为地震的中短期预报提供判据。最小信源滴的变化经历了一个由外围逐渐向未来地震区迁移的过程，根据这一特点可以追踪和确定地震危险区的范围。
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| 关 键 词： | 唐山地震 地震前兆 大同地震 单键群 时空群集特征 |
| 文章编号： | 1000-0844(2001)01-0013-08 |
| 收稿时间： | 1999/12/23 0:00:00 |
| 修稿时间： | 1999年12月23 |
A STUDY ON CLUSTERING FEATURES OF EARTHQUAKE PRECURSOR IN TIME-SPACE BY USING THE SINGLE-LINK CLUSTERMETHOD |
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| Liu Xi-qiang,Zhou Hui-lan,Wang Mei and Wang Hua-lin.A STUDY ON CLUSTERING FEATURES OF EARTHQUAKE PRECURSOR IN TIME-SPACE BY USING THE SINGLE-LINK CLUSTERMETHOD[J].Northwestern Seismological Journal,2001,23(1):13-20. |
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| Authors: | Liu Xi-qiang Zhou Hui-lan Wang Mei and Wang Hua-lin |
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| Institution: | Liu Xi qiang 1,Zhou Hui lan 2,Wang Mei 1,Wang Hua lin 1 |
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| Abstract: | By using the single link cluster method, precursor clustering features in time space of the Tangshan and Datong earthquakes are studied. Time space scanning to information entropy,average link length of the SLC frame and accumulation slide frequency of precursors of the two earthquakes is made.The results show that anomalies of the SLC frame before the earthquakes are very obvious,and can be divided into five periods.The anomalous magnitude is the largest from June,1975 to June,1976(fourth period).The information entropy drops further,change of average link length is the same with that in the fourth period and accumulation slide frequency of the precursors increases one month before the earthquakes(fifth period).The change period of anomalies may be taken for the judging index of middle or short term prediction of earthquakes.Change process of information entropy from outside to area of coming earthquake epicenter may be used to judge the range of earthquake danger area. |
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| Keywords: | Tangshan earthquake Earthquake precursor Anomalous character Datong earthquake Single link cluster |
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