Computer Science – Sound
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979jgr....84.1253n&link_type=abstract
Journal of Geophysical Research, Volume 84, Issue A4, p. 1253-1260
Computer Science
Sound
5
Scientific paper
Earthquake-generated Rayleigh waves excite shock waves at the surface of the earth which propagate upward nearly vertically through the atmosphere as infrasound. The HF Doppler sounder is a sensitive tool for detecting and recording these infrasounds at ionospheric heights. By constructing electron density distributions from ionograms the propagation ray paths and delay times for the long-period waves can be determined. By using these data the dispersion curves for oceanic Rayleigh waves have been deduced. These curves are within 5% of the expected curve synthesized from data obtained from seismograms. Application of these data to the 1969 Kurile Island earthquake shows that it had a single source, while application to the 1968 Tokachi-Oki earthquake shows the existence of several sources.
Najita Kazutoshi
Yuen Pong C.
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