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[B-10.2.2 Absolute Position Determination of the Tide Gauges by VLBI and GPS]

[Contact Person]

Makoto MURAKAMI
Head
Geodetic Research and Development Office, Geodetic Department
The Geographical Survey Institute
1 Kitasato, Tsukuba, Ibaraki, 305 JAPAN
Phone +81-298-64-1111 (Ext. 491), Fax +81-298-64-1802
E-mail vlbi@gaos.gsi-mc.go.jp

[Total Budget for FY1991-1992]

17,442,OOO Yen

[Abstract]

　Since a rise of mean sea level brings disastrous results to not only human living but also the entire world ecological system, it is drawing a world-wide attention. In order to predict a possible sea rise and its effects on human activities, one should monitor mean sea level variations using a tide gauge. However, raw data from tide gauge is contaminated by fictitious variation of sea level coming from height change of the gauge associated with crustal vertical deformation. Careful correction for vertical crustal movement is important for precise monitoring of real mean sea level change. To achieve this, an effective method to monitor mean sea level is developed using combined geodetic technologies, i.e., Very Long Baseline Interferometry(VLBI), Global Positioning System(GPS), and tide gauge. In this approach an ultra small site for VLBI is constructed and more effective analysis method for GPS is developed.

[Key Words]

Global Warming, Sea Level Rise, Tide Gauge, Very Long Baseline Interferometry(VLBI), and Global Positioning System(GPS)