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Telecommunications and Radio Engineering
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ISSN Online: 1943-6009

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Telecommunications and Radio Engineering

DOI: 10.1615/TelecomRadEng.v71.i18.60
pages 1687-1706

THE IONOSPHERIC PRECURSOR TO THE 2011 MARCH 11 EARTHQUAKE AS BASED ON THE JAPAN-PACIFIC SUBIONOSPHERIC VLF/LF NETWORK OBSERVATION

Masashi Hayakawa
Hayakawa Institute of Seismo Electromagnetics Co. Ltd.(Hi-SEM), The University of Electro-Communications (UEC) Alliance Center #521, Advanced & Wireless and Communications Research Center, UEC, Chofu, Tokyo, 182-8585, Japan
Y. Hobara
Research Station on Seismo Electromagnetics; UEC, Graduate School of Informatics and Engineering, Chofu Tokyo, Japan
A. Rozhnoi
Institute of Physics of the Earth, Russian Academy of Sciences, 10 Gruzinskaya, Moscow 123810, Russia
M. Solovieva
Institute of Physics of the Earth, Russian Academy of Sciences, 10 Gruzinskaya, Moscow 123810, Russia
K. Ohta
Chubu University, 1200 Matsumoto-cho, Kasugai Aichi 487-8501, Japan
J. Izutsu
Chubu University, 1200 Matsumoto-cho, Kasugai Aichi 487-8501, Japan
T. Nakamura
Kochi University, Akebono-cho, Kochi, Japan
Y. Yasuda
Hayakawa Institute of Seismo-Electromagnetics, Co. Ltd., UEC Incubation Center, Chofu Tokyo, Japan
H. Yamaguchi
Earthquake Analysis Laboratory, Information Systems Inc., Kita-aoyama 2-12-42- 305, Minato-ku Tokyo 107-0061, Japan
Y. Kasahara
UEC, Graduate School of Informatics and Engineering, Chofu Tokyo, Japan

ABSTRACT

By using the network observations of sub-ionospheric VLF/LF signals in Japan and Russia, we found a significant ionospheric perturbation prior to the 2011/3/11 Japan earthquake (EQ). A remarkable decrease was detected in the nighttime amplitude and increase in the dispersion on March 5 and 6, on the paths from NLK (Seattle, USA) to Chofu, Kochi and Kasugai. We found also the anomalies in March 1-6 period and minima in the nighttime amplitude on March 3 and 4 on the path JJI (Miyazaki, Kyushu) - Kamchatka, Russia. We describe perturbations and discuss the relevant geophysical environment. Data are compared with perturbations of many inland EQs, and with the spatial scale of similar oceanic Sumatra EQ in 2004. The generation mechanism of ionospheric perturbations is outlined.