Precursors of earthquakes in the line-of-sight propagation on VHF band
Precursors of earthquakes in the line-of-sight propagation on VHF band
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VHF 频段视距传播中的地震前兆
DOI：
10.1541/jae.29.95
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发表时间：
2009
期刊：
影响因子：
--
通讯作者：
K. Motojima
中科院分区：
文献类型：
--
作者：
K. Motojima
本文旨在找出甚高频频段视线异常传播与甚高频传播路径附近地震发生的关系。对VHF频段的电视广播电波进行了504天的连续测量，组成了一套自动测量系统。这些波在从东京塔到群马大学的视线上传播。在甚高频波段上进行了测量。为了区分异常传播数据和正常传播数据，采用与平均值的6倍偏差作为区分异常传播数据和正常传播数据的标准的统计处理。在异常传播出现到地震发生之间的时间间隔小于48小时(2天)的时间内，异常传播还被认为与地震有关。在504天的观察期内，只发生了4次异常传播，我们观测到了与这些异常传播有关的3次地震。结果发现，VHF频段视线传播的异常可能与VHF传播路径附近的地震有关。
This paper was intended to find out any relation between anomalous line-of-sight propagations on VHF band and occurrences of earthquakes near the VHF propagation path. The TV broadcasting waves on the VHF band were measured continuously for 504 days, in which we assembled an automatic measurement system. The waves propagated on the line-of-sight from Tokyo Tower to Gunma Univ. in Kiryu were measured on VHF band. In order to distinguish anomalous propagation data from normal data, a statistical process is adopted in such a way that six times deviation from the mean value was adopted as a criterion for distinguishing between the anomalous or normal propagation data. In a time interval between the appearance of anomalous propagation and the occurrence of earthquake was shorter than 48 hours (2 days), the anomalous propagation was additionally recognized as being associated with the earthquake. During the observation period of 504 days, only four anomalous propagations happened and we observed three earthquakes associated with these anomalous propagations. As a result, it is found that anomalous line-of-sight propagations on VHF band might be associated with the earthquakes near the VHF propagation path.
影响因子：
5.2
作者：
Fujiwara, H;Kamogawa, M;Ohtsuki, YH
通讯作者：
Ohtsuki, YH