HR: 0800h
AN: T51B-0459    [Abstracts]
TI: Association of SLHF and Ionospheric Anomalies with the Coastal Earthquakes of Japan
AU: Cervone, G
EM: gcervone@gmu.edu
AF: Center for Earth Observing and Space Research, 4400 University Drive MSN 5C3, Fairfax, VA 22030 United States
AU: Hayakawa, M
EM: haya@post.kek.jp
AF: The University of Electro-Communications, The University of Electro-Communications, Tokyo, 00000 Japan
AU: Maekawa, S
EM: maekawa@whistler.ee.uec.ac.jp
AF: The University of Electro-Communications, The University of Electro-Communications, Tokyo, 00000 Japan
AU: Kafatos, M
EM: mkafatos@compton@gmu.edu
AF: Center for Earth Observing and Space Research, 4400 University Drive MSN 5C3, Fairfax, VA 22030 United States
AU: * Singh, R P
EM: rsingh3@gmu.edu
AF: Center for Earth Observing and Space Research, 4400 University Drive MSN 5C3, Fairfax, VA 22030 United States
AB: Earthquakes are frequent natural hazards that pose a serious threat to our society. Numerous earthquakes occur every year throughout the globe, which may cause little to severe damage depending on their magnitude, depth, location, and the level of preparedness of the inhabitants of the affected region. In the recent years, numerous types of precursory signals of impending earthquakes have been observed and studied. VLF/LF subionospheric radio wave monitoring is being widely carried out in Japan for analysis of earthquake preparatory process, and several anomalies have been observed prior to large earthquakes of Japan using ground based and satellite measurements. Similarly SLHF has recently been introduced as a possible precursor, and in the case of coastal earthquakes, the consistent occurrence of anomalous SLHF peaks few days prior to the main earthquake event has been observed. In the present work we have compared ionospheric and SLHF anomalies of various Japanese coastal earthquakes. In the case of the Tokachi earthquake, SLHF anomalies in NCEP/NCAR data, and ionospheric anomalies in data from the HOK station in Japan and KAM station in Kamchatka, Russia, exhibit a very similar behavior. In particular the Japanese station show two large anomalous signals 5 days prior and 7 days after the main earthquake event, which show complementary nature with the SLHF anomaly for the same region. The SLHF and ionospheric anomalies associated with coastal earthquakes of Japan show a close relation.
DE: 7209 Earthquake dynamics and mechanics
DE: 7212 Earthquake ground motions and engineering
DE: 7215 Earthquake parameters
DE: 7218 Lithosphere and upper mantle
SC: Tectonophysics [T]
MN: 2004 AGU Fall Meeting