通海地磁Z分量月变速率与云南中强震预测指标

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英文篇名：Monthly variation rate of geomagnetic Z-component at Tonghai Station and prognostic index before medium-strong earthquakes happened in Yunnan area 中文刊名：地震地磁观测与研究 英文刊名：Seismological and Geomagnetic Observation and Research 作者：李树华 ; 陈燕 ; 赵小燕 英文作者：Li Shuhua ; Chen Yan and Zhao Xiaoyan (Earthquake Administration of Yunnan Province ; Kunming 650224.China) 中文关键词：通海地磁Z ; 月变速率 ; 中强地震 ; 云南省地区 英文关键词：geomagnetic Z-component of at Tonghai station ; monthly variation rate ; mediumstrong earthquakes ; Yunnan area 出版日期：2011-02-25 机构：云南省地震局; 年：2011 期：01 出版单位：地震地磁观测与研究

摘要

利用云南通海1987—2009年的地磁Z分量观测资料,进行差分计算,得到相应的月变速率值。以△Z≥10 nT为判定指标,定量分析云南地区M≥5地震前,通海地磁Z分量月变速率的异常变化。结果表明,通海Z分量月变速率大于10 nT与云南地区5级以上地震对应较好,异常出现后1—6个月云南省地区发生5级以上地震的可能性较大,对应率可达80%。
The monthly variation rate value of geomagnetic Z-component has been obtained through difference calculation using geomagnetic Z-component data at Tonghai station from 1987 to 2009.Using △Z≥10 nT as a judging index,we quantitative analysis anomaly changes of geomagnetic Z-component's monthly variation rate at Tonghai Station before the earthquakes with M≥5 in Yunnan.The result showed that the link between △Z≥10 nT and earthquakes with M≥5 in Yunnan is obvious.The possibility of earthquakes M≥5 happened 1—6 months later after the anomalies occurred is big,and the corresponding rate can reach 80%.

引文

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