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High resolution mapping of Earth tide response based on GPS data in Japan

Ito, Takeo and Okubo, Makoto and Sagiya, Takeshi (2009) High resolution mapping of Earth tide response based on GPS data in Japan. Journal of Geodynamics, 48 (3-5). pp. 253-259. ISSN 0264-3707.

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We observe the Earth tidal fields at diurnal and semi-diurnal periods using Kinematic Precise Point Positioning (KPPP) GPS analysis. Our KPPP GPS solutions compare well with super-conducting gravimeter (SG) observations and a theoretical Earth tidal model, that includes both ocean tide loading model and body tides. We make a high resolution map of the observed Earth tidal response fields using the Japanese GEONET GPS network which consists of 1200 sites. We find that: (1) the average phase of GPS data lags 0.11±0.04° from our theoretical Earth tidal model, (2) the average amplitude ratio between GPS and the theoretical Earth tidal model is 1.007±0.003, (3) the amplitude in the Kyushu district is about 1.0–1.5±0.3% larger than in the Hokkaido district, and (4) the amplitude at the Japan Sea side is about 0.5±0.2% larger than that at the Pacific Ocean side. These results suggest that we may be able to place constraints on Earth structure using GPS-derived tidal information.

Item Type:Article
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URLURL TypeDescription
Ito, Takeo0000-0003-1661-9943
Okubo, Makoto0000-0001-7784-6053
Sagiya, Takeshi0000-0001-7949-8048
Additional Information:© 2009 Elsevier Ltd. Available online 1 October 2009. We thank Mr. T. Takasu for providing us his GPS analysis codes called “GPSTools ver. 0.6.3”. The authors highly appreciate Dr. Koji Matsumoto, Dr. Harald Schuh and an anonymous reviewer for their careful reviews and helpful comments. We gratefully acknowledge Dr. Mark Simons for valuable comments and improving the English. We have used the GOTIC2 program package (Matsumoto et al., 2001) for the Earth tidal computation. This study is partly supported by Grants-in-Aid for Scientific Research of MEXT of Japan: No. 20740254 and JSPS Postdoctoral Fellowships for Research Abroad.
Funding AgencyGrant Number
Scientific Research of MEXT of Japan20740254
Japan Society for the Promotion of Science (JSPS) Postdoctoral FellowshipUNSPECIFIED
Subject Keywords:KPPP GPS; Earth tides; GEONET
Issue or Number:3-5
Record Number:CaltechAUTHORS:20100119-093050173
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17206
Deposited By: Ruth Sustaita
Deposited On:21 Jan 2010 18:25
Last Modified:03 Oct 2019 01:24

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