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Volume 52 Supplement 10

Special Issue: Application of GPS and other space geodetic techniques to Earth Sciences (1)

Preliminary results from permanent GPS array by the Geological Survey of Japan in conjunction with groundwater-level observations

Abstract

A regional continuous Global Positioning System (GPS) array, consisting of uniform antenna type, has been established by the Geological Survey of Japan (GSJ) mainly around the Kansai district. Geodetic results for 2.5 years data are as follows. In comparison with the solutions obtained from the Geographical Survey Institute (GSI) continuous GPS array which employs different type of antenna from the GSJ’s array, it was found that the agreements between the daily positions were about 10 mm in horizontal and 15 to 20 mm in vertical components. This result indicates that the influence of the antenna type difference is at this level. The GSJ’s GPS stations around the Kansai district were found to have a common annual variation in the vertical component, whose amplitude was different from site to site. There were small correlations with in situ measurements of groundwater-level variation, except for the two stations whose annual variations of the GPS vertical component were the largest. The vertical displacements due to elastic deformation by groundwater-pressure changes in the aquifers were estimated using a simple model, but they were too small to account for the observed variations.

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Correspondence to Ryu Ohtani.

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Ohtani, R., Koizumi, N., Matsumoto, N. et al. Preliminary results from permanent GPS array by the Geological Survey of Japan in conjunction with groundwater-level observations. Earth Planet Sp 52, 663–668 (2000). https://doi.org/10.1186/BF03352260

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  • DOI: https://doi.org/10.1186/BF03352260

Keywords

  • Global Position System
  • Groundwater Level
  • Annual Variation
  • Global Position System Station
  • Zenith Total Delay