Nawa, Kazunari; Suda, Naoki; Fukao, Yoshio; Sato, Tadahiro; Tamura, Yoshiaki; Shibuya, Kazuo; McQueen, Herbert; Virtanen, Heikki; Kaariainen, Jussi
Records of superconducting gravimeters (SGs) at Canberra (Australia), Esashi (Japan), Metsahovi (Finland) and Syowa Stations (Antarctica) were analyzed to search for further evidence of background free oscillations of the Earth. Spectrograms for 1-year period and averaged power spectra for seismically quiet periods were obtained for each of the stations. Anomalous features of the oscillations observed at Syowa Station, such as an apparent seasonal variation and a high intensity at frequencies...[Show more]
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