HF-Doppler observations of acoustic waves excited by the Urakawa-Oki earthquake on 21 March 1982

Details HF-Doppler observations of acoustic waves excited by the Urakawa-Oki earthquake on 21 March 1982 HF-Doppler observations of acoustic waves excited by the Urakawa-Oki earthquake on 21 March 1982

Mar 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984jatp...46..233t&link_type=abstract

Journal of Atmospheric and Terrestrial Physics (ISSN 0021-9169), vol. 46, March 1984, p. 233-245. Research supported by the Mini

Computer Science

Sound

24

Acoustic Propagation, Atmospheric Sounding, Doppler Radar, Earthquakes, Ionospheric Disturbances, Air Land Interactions, Atmospheric Circulation, Digital Filters, High Frequencies, Low Pass Filters

Scientific paper

Ionospheric disturbances caused by the Urakawa-Oki earthquake at 0232 UT on 21 March 1982 have been detected by a network of HF-Doppler sounders in central Japan. The HF-Doppler data, together with the seismic data, have been used to formulate a mechanism whereby ionospheric disturbances are produced by an event of relatively small epicentral distance. Comparison of the dynamic spectra of these data has revealed experimentally that the atmosphere acts as a low-pass filter for the upward-propagating acoustic waves. The cut-off periods of this filter are estimated by applying a digital filter technique to the up-down component of the seismograms and are found to be 10 s from the ground up to 156 km and 20 s from 156-195 km. Considering the transfer function of the atmosphere derived from the theory of Pitteway and Hines, the observed result does not contradict the prediction that the atmospheric filter mechanism is mainly attributable to viscosity.

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