Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records
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 seismical...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/90072 2023-05-15T13:56:14+02:00 Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records Nawa, Kazunari Suda, Naoki Fukao, Yoshio Sato, Tadahiro Tamura, Yoshiaki Shibuya, Kazuo McQueen, Herbert Virtanen, Heikki Kaariainen, Jussi 2015-12-13T23:18:14Z http://hdl.handle.net/1885/90072 unknown Elsevier 0031-9201 http://hdl.handle.net/1885/90072 Physics of the Earth and Planetary Interiors Keywords: gravimetry noise oscillation Background free oscillations GEOSCOPE IDA Noise level SG Journal article 2015 ftanucanberra 2015-12-21T23:57:38Z 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 between 3 and 4 mHz, were absent at the other SG stations. Among the SG stations used in this study, the background free oscillations were detected most consistently and distinctly at Canberra, where the noise level was comparable to that at the IDA quietest station, while that at Syowa Station was close to the critical limit for detecting the oscillations. The background free oscillations provide a good reference to evaluate the noise level in the milliHertz band. (C) 2000 Elsevier Science B.V. All rights reserved. Article in Journal/Newspaper Antarc* Antarctica Australian National University: ANU Digital Collections Ida ENVELOPE(170.483,170.483,-83.583,-83.583) Syowa Station |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: gravimetry noise oscillation Background free oscillations GEOSCOPE IDA Noise level SG |
spellingShingle |
Keywords: gravimetry noise oscillation Background free oscillations GEOSCOPE IDA Noise level SG Nawa, Kazunari Suda, Naoki Fukao, Yoshio Sato, Tadahiro Tamura, Yoshiaki Shibuya, Kazuo McQueen, Herbert Virtanen, Heikki Kaariainen, Jussi Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records |
topic_facet |
Keywords: gravimetry noise oscillation Background free oscillations GEOSCOPE IDA Noise level SG |
description |
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 between 3 and 4 mHz, were absent at the other SG stations. Among the SG stations used in this study, the background free oscillations were detected most consistently and distinctly at Canberra, where the noise level was comparable to that at the IDA quietest station, while that at Syowa Station was close to the critical limit for detecting the oscillations. The background free oscillations provide a good reference to evaluate the noise level in the milliHertz band. (C) 2000 Elsevier Science B.V. All rights reserved. |
format |
Article in Journal/Newspaper |
author |
Nawa, Kazunari Suda, Naoki Fukao, Yoshio Sato, Tadahiro Tamura, Yoshiaki Shibuya, Kazuo McQueen, Herbert Virtanen, Heikki Kaariainen, Jussi |
author_facet |
Nawa, Kazunari Suda, Naoki Fukao, Yoshio Sato, Tadahiro Tamura, Yoshiaki Shibuya, Kazuo McQueen, Herbert Virtanen, Heikki Kaariainen, Jussi |
author_sort |
Nawa, Kazunari |
title |
Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records |
title_short |
Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records |
title_full |
Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records |
title_fullStr |
Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records |
title_full_unstemmed |
Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records |
title_sort |
incessant excitation of the earths free oscillations: global comparison of superconducting gravimeter records |
publisher |
Elsevier |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/90072 |
long_lat |
ENVELOPE(170.483,170.483,-83.583,-83.583) |
geographic |
Ida Syowa Station |
geographic_facet |
Ida Syowa Station |
genre |
Antarc* Antarctica |
genre_facet |
Antarc* Antarctica |
op_source |
Physics of the Earth and Planetary Interiors |
op_relation |
0031-9201 http://hdl.handle.net/1885/90072 |
_version_ |
1766263602252087296 |