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Continuous excitation of planetary free oscillations by atmospheric disturbances

Author

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  • Naoki Kobayashi

    (Earth and Planetary Sciences, Tokyo Institute of Technology)

  • Kiwamu Nishida

    (Earth and Planetary Sciences, Tokyo Institute of Technology
    University of Tokyo)

Abstract

Seismology provides a powerful tool for probing planetary interiors1,2, but it has been considered inapplicable to tectonically inactive planets where earthquakes are absent. Here, however, we show that the atmospheres of solid planets are capable of exerting dynamic pressure on their surfaces, thereby exciting free oscillations with amplitudes large enough to be detected by modern broad-band seismographs. Order-of-magnitude estimates of these forces give similar amplitudes of a few nanogals for the Earth, Venus and Mars despite widely varying atmospheric and ambient conditions. The amplitudes are also predicted to have a weak frequency dependence. Our analysis of seismograms, recorded continuously from 1992 to 1993 at 13 globally distributed stations, shows strong evidence for continuously excited fundamental-mode free oscillations on the Earth. This result, together with other recent studies3,4,5, is consistent with our estimate of atmospheric forcing and we therefore propose that it may be possible to detect atmospheric excitation of free oscillations on Venus and Mars as well.

Suggested Citation

  • Naoki Kobayashi & Kiwamu Nishida, 1998. "Continuous excitation of planetary free oscillations by atmospheric disturbances," Nature, Nature, vol. 395(6700), pages 357-360, September.
    • Handle: RePEc:nat:nature:v:395:y:1998:i:6700:d:10.1038_26427
    DOI: 10.1038/26427
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    Cited by:

    1. A. Lyubushin, 2014. "Dynamic estimate of seismic danger based on multifractal properties of low-frequency seismic noise," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 70(1), pages 471-483, January.

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