地磁谐波振幅比异常与强地震
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摘要
分析7级以上强地震前地磁谐波振幅比的异常变化特征,初步发现:7级以上地震的地磁谐波振幅比趋势性异常特征与5~6级地震的特征基本一样,即地震基本上都是发生在地磁谐波振幅比趋势性下降之后的转折期、恢复上升期及恢复后的初期阶段,震前异常持续时间一般在4年以上,异常幅度较大,一般在0.10~0.20以上。同时回顾了汶川8级地震震前预报过程。
This article briefly describes the abnormal variation of geomagnetic harmonic wave amplitude ratio before several earthquakes with MS≥7. The preliminary analysis shows that the characteristic of the long-term tendency anomaly of geomagnetic harmonic wave amplitude ratio of earthquakes with MS≥7 is the same as that of MS5~6 earthquakes. Most of the strong earthquakes occurred in the transition phase, restoring and rising phase, and the early phase of the restoring after geomagnetic harmonic wave amplitude ratio's trend decrease. The anomaly before the earthquake usually lasted for more than 4 years, and the anomaly amplitude usually is more than0.10~0.20. The article also reviews the Wenchuan 8.0 earthquake's forecasting process.
引文
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