Interpretation in terms of gyrotropic waves of Schumann-resonance-like line emissions observed at Nakatsugawa in possible association with nearby Japanese earthquakes

被引：20

作者：

Hayakawa, M. ^{[1
,2
]}

Ohta, K. ^{[3
]}

Sorokin, V. M. ^{[5
]}

Yaschenko, A. K. ^{[5
]}

Izutsu, J. ^{[4
]}

Hobara, Y. ^{[2
]}

Nickolaenko, A. P. ^{[6
]}

机构：

[1] UEC, Adv Wireless Commun Res Ctr, Tokyo 1828585, Japan

[2] UEC, Res Stn Seismo Electromagnet, Tokyo 1828585, Japan

[3] Chubu Univ, Dept Elect Informat Engn, Aichi 4878510, Japan

[4] Chubu Univ, Res Ctr Earth Watch & Safety Net, Aichi 4878510, Japan

[5] Inst Terr Magnetism Ionosphere & Radio Wave Propa, Troitsk Town 142190, Moscow Region, Russia

[6] Usikov Inst Radiophys & Elect, Kharkov, Ukraine

来源：

JOURNAL OF ATMOSPHERIC AND SOLAR-TERRESTRIAL PHYSICS | 2010年 / 72卷 / 17期

关键词：

Seismo-electromagnetics; Schumann resonance; ELF band; Line emissions; Earthquakes; CHI-CHI EARTHQUAKE; IONOSPHERIC PERTURBATIONS;

D O I：

10.1016/j.jastp.2010.09.014

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

The observation of ULF/ELF electromagnetic waves in the frequency range below 50 Hz has been continued at Nakatsugawa (in the Gifu prefecture), Japan since 1998. This paper summarizes anomalous Schumann resonance (SR) phenomena and SR-like line emissions observed at Nakatsugawa in possible association with recent nearby earthquakes (EQs) (the 2004 Mid-Niigata prefecture and the 2007 Noto-Hanto (peninsula) EQs), which have been already described in detail by Ohta etal. (2009). The intensity of particular modes of SR increased before these large EQs and the excitation of other anomalous SR-like line emissions also existed at the frequency shifted by about 2 Hz from the typical SR modes. Since temporal changes of the anomalous SR modes and line emissions are synchronous in time, there might be a possibility that the line emission is a consequence of the anomalous SR. In this paper we propose an interpretation of those anomalous phenomena in terms of excitation of gyrotropic waves due to input wave from below with a band from 15 to 20 Hz as an exciter. The theoretical computational results seem to be generally consistent with the observational finding. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：1292 / 1298

页数：7

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