Observation of Earth's free oscillation by dense GPS array: After the 2011 Tohoku megathrust earthquake

Mitsui, Yuta; Heki, Kosuke

Scientific Reports, 2012, 2(931), 1-4

Permalink : https://hdl.handle.net/2115/50955

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MitsuiHeki_SciRep2012	pdf	513 KB	1,049

アクセス権	open access
URI	https://hdl.handle.net/2115/50955
タイトル	Observation of Earth's free oscillation by dense GPS array: After the 2011 Tohoku megathrust earthquake
著者	e-Rad_Researcher 80717950 著者名 Mitsui, Yuta
著者	e-Rad_Researcher 30280564 著者名 Heki, Kosuke
言語	英語
発行日	2012-12-05
出版者	Nature Publishing Group
収録物名	Scientific Reports
巻(号)	2(931)
ページ	1-4
抄録	Day-scale Earth’s free oscillation after large earthquakes has been detected by underground instruments such as strainmeters, gravimeters and seismometers, to investigate Earth’s internal structure, geodynamics, and source properties of earthquakes. Here we show that Global Positioning System (GPS) can also detect the signals of the Earth’s free oscillation. A dense GPS array in Japan (GEONET) recorded the surface deformation following the 2011 Tohoku megathrust earthquake. A simple array analysis over 300 stations reduces local noise in GPS time series. We find that the dense GPS array truly detected both spheroidal and toroidal fundamental modes in three-direction displacement. This new tool has a strong potential to investigate the free oscillations particularly in low-frequency bands.
資源タイプ	学術雑誌論文
出版タイプ	Version of Record
権利情報	Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported
EISSN	2045-2322
関連情報 (isIdenticalTo)	出版社版DOI https://doi.org/10.1038/srep00931