Atmospheric anomalies observed during earthquake occurrences
Atmospheric anomalies observed during earthquake occurrences
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DOI：
10.1029/2004gl019865
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发表时间：
2004-09-11
影响因子：
5.2
通讯作者：
Ohtsuki, YH
中科院分区：
文献类型：
--
作者：
Fujiwara, H;Kamogawa, M;Ohtsuki, YH
通过对超视距VHF电磁波异常传播的观测，证实了地震前大气中出现的异常现象。通过之前15天的运行中位数及其四分位数间距，确定了一天中几分钟-几小时内接收强度的异常增加。EQ出现与异常之间的互相关表明，在M大于或等于4.8 EQ之前的5天内，异常的出现显著增强。5天内出现异常的日平均数是其他日数的2.4倍。通过对接收到的电磁波进行偏振测量，发现大气中存在异常。
Appearance of anomalies in the atmosphere before earthquakes (EQs) has been verified, through observation of anomalous transmission of VHF electromagnetic ( EM) waves beyond line-of-sight. Anomalous increase of the received intensity for a few minutes - several hours on a day was identified by the previous 15-day running median and its inter-quartile range. The cross-correlation between the EQ occurrences and the anomalies shows that the appearance of anomalies was significantly enhanced within 5 days before M greater than or equal to 4.8 EQs. The one-day average number of the anomaly appearance within 5 days was found 2.4 times larger than that of other days. Through the polarization measurement of the received EM waves, the anomalies were found to occur in the atmosphere.