Subionospheric VLF signal perturbations possibly related to earthquakes
Subionospheric VLF signal perturbations possibly related to earthquakes
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DOI：
10.1029/98ja00999
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发表时间：
1998-08-01
影响因子：
2.8
通讯作者：
Hayakawa, M
中科院分区：
文献类型：
--
作者：
Molchanov, OA;Hayakawa, M
Hayakawa等人[1996 a，B]首次报道了与地震活动有关的可能的甚低频亚电离层信号效应，并将其与科比大地震联系起来。为了了解这种影响的主要特征，我们分析了其他10次大地震（震级大于6）期间的类似数据。分析表明，这种效应表现为5 ~ 10天周期的瞬变振荡，在大震前几天开始，在大震后几天至几周内衰减，主要与地壳地震有关。当地震前存在周期在5-11天范围内的大气共振振荡时，它就出现了。地震对VLF信号的影响可能是由于地震过程中长周期重力波的产生及其在70-90公里高度的增强。
A likely VLF subionospheric signal effect related to seismic activity was first reported by Hayakawa et al. [1996a, b] in association with the great Kobe earthquake. We have analyzed similar data during periods around 10 other great; earthquakes (magnitude M>6) in order to understand the main features of such an effect. The following characteristics emerged from our analysis: The effect appears as a transient oscillation with a 5- to 10-day period, which is initiated a few days before a large earthquake and decays over a few days to weeks after it. It is mainly related to crustal earthquakes. It appears when resonant atmospheric oscillations with periods in a range of 5-11 days exist before the earthquake. The seismic influence on the VLF signal is probably explained by the generation of long-period gravity waves during the earthquake process and their intensification at heights of 70-90 km.