Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records
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Nawa, Kazunari; Suda, Naoki; Fukao, Yoshio; Sato, Tadahiro; Tamura, Yoshiaki; Shibuya, Kazuo; McQueen, Herbert; Virtanen, Heikki; Kaariainen, Jussi
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...[Show more]
dc.contributor.author | Nawa, Kazunari | |
---|---|---|
dc.contributor.author | Suda, Naoki | |
dc.contributor.author | Fukao, Yoshio | |
dc.contributor.author | Sato, Tadahiro | |
dc.contributor.author | Tamura, Yoshiaki | |
dc.contributor.author | Shibuya, Kazuo | |
dc.contributor.author | McQueen, Herbert | |
dc.contributor.author | Virtanen, Heikki | |
dc.contributor.author | Kaariainen, Jussi | |
dc.date.accessioned | 2015-12-13T23:18:14Z | |
dc.identifier.issn | 0031-9201 | |
dc.identifier.uri | http://hdl.handle.net/1885/90072 | |
dc.description.abstract | 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. | |
dc.publisher | Elsevier | |
dc.source | Physics of the Earth and Planetary Interiors | |
dc.subject | Keywords: gravimetry; noise; oscillation Background free oscillations; GEOSCOPE; IDA; Noise level; SG | |
dc.title | Incessant excitation of the Earths free oscillations: global comparison of superconducting gravimeter records | |
dc.type | Journal article | |
local.description.notes | Imported from ARIES | |
local.description.refereed | Yes | |
local.identifier.citationvolume | 120 | |
dc.date.issued | 2000 | |
local.identifier.absfor | 040405 - Gravimetrics | |
local.identifier.ariespublication | MigratedxPub20346 | |
local.type.status | Published Version | |
local.contributor.affiliation | Nawa, Kazunari, Geological Survey of Japan | |
local.contributor.affiliation | Suda, Naoki, Hiroshima University | |
local.contributor.affiliation | Fukao, Yoshio, University of Tokyo | |
local.contributor.affiliation | Sato, Tadahiro, National Astronomical Observatory of Japan | |
local.contributor.affiliation | Tamura, Yoshiaki, National Astronomical Observatory of Japan | |
local.contributor.affiliation | Shibuya, Kazuo, National Institute of Polar Research | |
local.contributor.affiliation | McQueen, Herbert, College of Physical and Mathematical Sciences, ANU | |
local.contributor.affiliation | Virtanen, Heikki, Finnish Geodetic Institute | |
local.contributor.affiliation | Kaariainen, Jussi, Finnish Geodetic Institute | |
local.description.embargo | 2037-12-31 | |
local.bibliographicCitation.issue | 4 | |
local.bibliographicCitation.startpage | 289 | |
local.bibliographicCitation.lastpage | 297 | |
local.identifier.doi | 10.1016/S0031-9201(00)00158-8 | |
dc.date.updated | 2015-12-12T08:55:54Z | |
local.identifier.scopusID | 2-s2.0-0033915377 | |
Collections | ANU Research Publications |
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