【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%。更多还原

【Abstract】 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%.更多还原