ＧＰＳ連続観測システム"ＧＥＯＮＥＴ"とその展望
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概要
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GEONET (GPS Earth Observation Network System), which is a nationwide GPS array and data analysis system of the Geographical Survey Institute, started in 1994. Since then, it has been expanded and improved to monitor crustal deformation of Japanese islands quickly and accurately. Today, it is the densest GPS observation network in the world with 1, 200 GPSbased control stations and some other stations. GEONET has contributed its continuous data to various fields of earth science. In seismo tectonics study, it provided the features of coseismic crustal deformation as well as the steady state crustal deformations by plate motion. Five interplate slow slip events were also found by GEONET and has been playing important role to the recent plate coupling studies. In volcanological study, it provided the sequence of magma activity utilized for the estimation of eruption. GEONET also provided a new measure to detect ionospheric and meteorological signals and have been contributing to atmospheric science. The observed 1 Hz data of almost all stations are now provided to commercial users for positioning services in real time. GEONET is becoming a kind of infrastructure of the locationbased information society. The major present research subjects are improvement of the detectability, development of real-time analysis of crustal deformation, etc. It is also important for the future use of GEONET to maintain observation circumstances properly and to be adapted to the GPS modernization and new GNSSs.
- 日本測地学会の論文
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