Physics
Scientific paper
Jan 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998pepi..105..261o&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 105, Issue 3-4, p. 261-269.
Physics
4
Scientific paper
A great earthquake of M 7.8 occurred near the Okushiri island off the Hokkaido southwest coast in northern Japan at 2217 JST (UT+9 h), July 12, 1993. Systematic decreases of the ionospheric F2-layer critical frequency, foF2 below its monthly median, were observed at Wakkanai, Kokubunji and Yamagawa, Japan from 3 days before the earthquake onset to 3 days after it. The virtual height of the ionospheric F-layer, h'F increased above its monthly median for nights of July 9, 10 and 11 before the earthquake onset at Kokubunji; while the h'F decreased below its monthly median for nights of July 12, 13 and 14 after the earthquake onset. Local geomagnetic activities near the three ionospheric stations were quiet or moderate with no geomagnetic storm from July 5 to July 16. The ionospheric disturbances observed were independent of solar-terrestrial events. Possible generation mechanisms are discussed on the ionospheric disturbances associated with the earthquake.
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