Physics
Scientific paper
Apr 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pepi...77...97h&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 77, Issue 1-2, p. 97-108.
Physics
13
Scientific paper
The purpose of this paper is to examine the possible seismic influence on the propagation of magnetospheric whistlers at low latitudes on the basis of long-term data observed at Sugadaira (geomagnetic latitude 25°N) during 1970-1978 and at Sakushima (24°) during 1980-1982. It is found from statistical analysis of the Sugadaira data that anomalous whistlers whose dispersion value is greater than twice the typical value, exhibit a substantial increase in occurrence during seismic activity in the geographic longitude sector of 100°E-160°E, and this association becomes more enhanced when we take the occurrence of any whistlers (short, long and/or anomalous) during the summer time (June-August). Finally, with increasing anomaly (that is, anomalous dispersions and summertime), we have found an exceedingly high statistical correlation between the summertime anomalous whistlers at Sakushima and the seismic activity satisfying the above condition. We have studied whistler characteristics for all earthquakes. These studies have indicated that a considerable number of cases of earthquakes are of a type such that several earthquakes occur successively; and, correspondingly, we observed an enhanced occurrence of anomalous whistlers during such prolonged seismic activities. Several isolated and intense earthquakes are characterized by the appearance of anomalous whistlers prior to and after the earthquake. In conclusion, we claim that whistlers with anomalous dispersions are likely to be closely correlated with earthquakes occurring in the relevant longitude range, but we cannot make any definite statement on the use of low-latitude whistlers as precursors of earthquakes and further detailed studies are obviously required on this subject. Some possible mechanisms of the earthquake-associated effect causing whistler propagation are discussed.
Hayakawa Masahiko
Morgounov V. A.
Yoshino Taizoh
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