Anomalies of LF signal during seismic activity in November–December 2004
A signal transmitted by Japan Time Standard LF station (40 kHz, Fukushima prefecture) and recorded in Petropavlovsk-Kamchatski (Russia) is analyzed during a time interval from 1 July 2004 till 24 January 2005. This interval is characterized by quiet seismic conditions up to the beginning o...
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Copernicus Publications
2005-01-01
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Series: | Natural Hazards and Earth System Sciences |
Online Access: | http://www.nat-hazards-earth-syst-sci.net/5/657/2005/nhess-5-657-2005.pdf |
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doaj-fff942830f944a988eca45341b6ae0502020-11-24T23:09:01ZengCopernicus PublicationsNatural Hazards and Earth System Sciences1561-86331684-99812005-01-0155657660Anomalies of LF signal during seismic activity in November–December 2004A. A. RozhnoiM. S. SolovievaO. A. MolchanovM. HayakawaS. MaekawaP. F. BiagiA signal transmitted by Japan Time Standard LF station (40 kHz, Fukushima prefecture) and recorded in Petropavlovsk-Kamchatski (Russia) is analyzed during a time interval from 1 July 2004 till 24 January 2005. This interval is characterized by quiet seismic conditions up to the beginning of November, but rather strong seismic activity occurs in November and December not far from Hokkaido (Japan) and in the region of northern Kuril Islands. There were three series of earthquakes with M=5.6–7.1 in a zone of sensitivity of our wave path during two months. Nighttime 'bay-like' phase and amplitude anomalies of the LF signal are observed several days before and during every series of earthquakes. During the whole period of seismic activity a significant shift in terminator times is also evident. The spectrum of LF seismo-induced anomalies shows a clear increase for the period of about 25 min.http://www.nat-hazards-earth-syst-sci.net/5/657/2005/nhess-5-657-2005.pdf |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
A. A. Rozhnoi M. S. Solovieva O. A. Molchanov M. Hayakawa S. Maekawa P. F. Biagi |
spellingShingle |
A. A. Rozhnoi M. S. Solovieva O. A. Molchanov M. Hayakawa S. Maekawa P. F. Biagi Anomalies of LF signal during seismic activity in November–December 2004 Natural Hazards and Earth System Sciences |
author_facet |
A. A. Rozhnoi M. S. Solovieva O. A. Molchanov M. Hayakawa S. Maekawa P. F. Biagi |
author_sort |
A. A. Rozhnoi |
title |
Anomalies of LF signal during seismic activity in November–December 2004 |
title_short |
Anomalies of LF signal during seismic activity in November–December 2004 |
title_full |
Anomalies of LF signal during seismic activity in November–December 2004 |
title_fullStr |
Anomalies of LF signal during seismic activity in November–December 2004 |
title_full_unstemmed |
Anomalies of LF signal during seismic activity in November–December 2004 |
title_sort |
anomalies of lf signal during seismic activity in november–december 2004 |
publisher |
Copernicus Publications |
series |
Natural Hazards and Earth System Sciences |
issn |
1561-8633 1684-9981 |
publishDate |
2005-01-01 |
description |
A signal transmitted by Japan Time Standard LF station (40 kHz, Fukushima prefecture) and recorded in Petropavlovsk-Kamchatski (Russia) is analyzed during a time interval from 1 July 2004 till 24 January 2005. This interval is characterized by quiet seismic conditions up to the beginning of November, but rather strong seismic activity occurs in November and December not far from Hokkaido (Japan) and in the region of northern Kuril Islands. There were three series of earthquakes with M=5.6–7.1 in a zone of sensitivity of our wave path during two months. Nighttime 'bay-like' phase and amplitude anomalies of the LF signal are observed several days before and during every series of earthquakes. During the whole period of seismic activity a significant shift in terminator times is also evident. The spectrum of LF seismo-induced anomalies shows a clear increase for the period of about 25 min. |
url |
http://www.nat-hazards-earth-syst-sci.net/5/657/2005/nhess-5-657-2005.pdf |
work_keys_str_mv |
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