The data of 5 ionospheric vertical sounding stations before 4 earthquakes in Japan are analyzed. It is found that most of the critical frequencies of the E sporadic layer tended to decrease and the only few tended to increase around the epicenters before and after the earthquakes.

  • 分析日本4次地震前5个电离层垂测站资料,发现地震前后震中附近夜间电离层偶发E层的临界频率f0ES值多数呈下降趋势,少数呈增加趋势。

  • 互联网摘选 2025-01-20 11:59:29

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