A decade of GEONET: 1994-2003--The continuous GPS observation in Japan and its impact on earthquake studies

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書誌事項

タイトル別名
  • A decade of GEONET: 1994-2003
  • decade of GEONET 1994 2003 The continuous GPS observation in Japan and its impact on earthquake studies
  • A decade of GEONET: 1994–2003 —The continuous GPS observation in Japan and its impact on earthquake studies—
  • 1994–2003 The continuous GPS observation in Japan and its impact on earthquake studies
  • A decade of GEONET: 1994–2003—The continuous GPS observations in Japan and its impact on earthquake studies
  • A decade of GEONET: 1994–2003—The continuous GPS observation in Japan and its impact on earthquake studies
  • The continuous GPS observation in Japan and its impact on earthquake studies
公開日
2004
DOI
  • 10.1186/bf03353077
公開者
地球電磁気・地球惑星圏学会 、公益社団法人 日本地震学会、特定非営利活動法人 日本火山学会、日本測地学会、日本惑星科学会

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説明

The dense continuous GPS network of Japan, now called GEONET, has been operated since 1994 by the Geographical Survey Institute. GEONET provides precise daily coordinates of all the stations, with which displacement rates and strain rates are calculated nationwide. Various characteristics of tectonic deformation in the Japanese Islands have been revealed. GEONET is also quite useful in earthquake studies, precisely detecting co-seismic, post-seismic, and inter-seismic deformation signals. These observations are utilized to infer physical processes at earthquake sources. Slow slip events on plate boundaries have been found from GPS data. Such slow events provide an important constraint on the mechanism of faulting. On the other hand, there has been no success in detecting pre-seismic deformation. Lack of a precursory signal before the 2003 Tokachi-Oki (M8.0) earthquake has posed a serious question to short-term earthquake prediction. GEONET enables a good linkage between monitoring and modeling studies, opening a possibility of practical data assimilation. For further contribution to earthquake studies, it is necessary to continue GEONET with high traceability on the details in observation and analysis.

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