Journal cover Journal topic
Natural Hazards and Earth System Sciences An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 3.102
IF3.102
IF 5-year value: 3.284
IF 5-year
3.284
CiteScore value: 5.1
CiteScore
5.1
SNIP value: 1.37
SNIP1.37
IPP value: 3.21
IPP3.21
SJR value: 1.005
SJR1.005
Scimago H <br class='widget-line-break'>index value: 90
Scimago H
index
90
h5-index value: 42
h5-index42
Volume 5, issue 5
Nat. Hazards Earth Syst. Sci., 5, 657–660, 2005
https://doi.org/10.5194/nhess-5-657-2005
© Author(s) 2005. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

Special issue: Seismic hazard evaluation, precursory phenomena and seismo...

Nat. Hazards Earth Syst. Sci., 5, 657–660, 2005
https://doi.org/10.5194/nhess-5-657-2005
© Author(s) 2005. This work is licensed under
the Creative Commons Attribution-NonCommercial-ShareAlike 2.5 License.

  09 Sep 2005

09 Sep 2005

Anomalies of LF signal during seismic activity in November–December 2004

A. A. Rozhnoi1, M. S. Solovieva1, O. A. Molchanov1, M. Hayakawa1, S. Maekawa2, and P. F. Biagi3 A. A. Rozhnoi et al.
  • 1Institute of the Physics of the Earth, Moscow, Russia
  • 2The University of Electro-Communications, Department of Electronic Engineering, Tokyo, Japan
  • 3Department of Physics, University of Bari, Bari, Italy

Abstract. 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.

Publications Copernicus
Download
Citation
Altmetrics