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Earth, Planets and Space

, Volume 50, Issue 10, pp 883–885

First Online: 06 June 2014Received: 22 April 1998Revised: 09 July 1998Accepted: 23 July 1998

Abstract

The report of Nawa et al. 1998 that incessant excitation of the Earth’s free oscillations was discovered in the low frequency spectra of the superconducting gravimeter at the Syowa station in Antarctica is reexamined. The mean spectra for Syowa are compared with those for Matsushiro, another superconducting gravimeter station in an extremely calm circumstance, hence showing a much lower noise level than Syowa. Although the spectra for Syowa have many peaks below 3 mHz corresponding to those present in the time-frequency diagram of Nawa et al., no similar peaks are found in the spectra for Matsushiro. This result suggests that the peaks below 3 mHz in the Syowa spectra are not real signals of the Earth’s free oscillations.

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Autor: Yuichi Imanishi

Fuente: https://link.springer.com/







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