Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes
Stochastic relation between anomalous propagation in the line-of-sight VHF radio band and occurrences of earthquakes
复制标题
视距甚高频无线电频段的异常传播与地震发生之间的随机关系
DOI：
10.5194/nhess-14-2119-2014
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发表时间：
2013
影响因子：
4.6
通讯作者：
N. Haga
中科院分区：
文献类型：
--
作者：
K. Motojima;N. Haga
抽象。本文的目的是找出甚高频（VHF）波段异常视距传播与VHF传播路径附近地震发生之间的关系。对甚高频波段的电视和调频无线电广播电波进行了长期连续监测。为此，建立并使用了一个多方向甚高频频段监测系统。通过统计分析，将VHF波段上的异常视线传播与监测波区分开来。经过随机性考虑，发现与异常传播有关的地震以震级M ≥ 4.5，距震中距离L ≤ 75km为特征。在相关地震发生前几天，在VHF波段上监测到了异常传播。此外，异常同时出现在多个方向的传播路径上。视向传播的异常显示了震中区域狭窄的可能性。
Abstract. This paper was intended to find out any relation between anomalous line-of-sight propagation on the very high frequency (VHF) band and occurrences of earthquakes near the VHF propagation paths. The television and FM radio broadcasting waves on the VHF band were monitored continuously over the long term. For that purpose, a multidirectional VHF band monitoring system was established and utilized. Anomalous line-of-sight propagation on the VHF band was distinguished from the monitored wave by using a statistical analysis. After the stochastic consideration, it was found out that earthquakes associated with anomalous propagation were characterized by magnitude of earthquakes M ≥ 4.5, and distances from epicenters L ≤ 75 km. The anomalous propagation was monitored on the VHF band a few days before the associated earthquakes occurred. Moreover, the anomaly appeared on multidirectional propagation paths simultaneously. The anomaly on the line-of-sight propagation indicates the possibility of narrowly focusing the area of the epicenter of earthquake.
影响因子：
5.2
作者：
Fujiwara, H;Kamogawa, M;Ohtsuki, YH
通讯作者：
Ohtsuki, YH