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Effect of Groundwater on Gravity Observation at Kyoto

  • Atsushi Mukai
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 117)

Abstract

Effect of groundwater variations on gravity observation was examined by employing gravity data obtained from two superconducting gravity meters at Kyoto, as well as data of groundwater level and rainfall during the period from February 1992 to July 1996. Gravity changes of several μ gals were observed according to groundwater level changes of 2 m. The gravity changes are in proportion to the change of the groundwater level. The admittance was determined to be 3.56 μ gal/m and the gravity changes followed the change of the groundwater level with a lag of 1.6 day. The gravity changes due to groundwater variations can be calculated in the order of 1 μ gal by employing data of groundwater level obtained at a well. Although change of groundwater level can be estimated using rainfall data with the precision of a few tenths meter, response function of groundwater to rainfall should be revised when drainage condition is changed due to construction works near the station.

Keywords

Groundwater Level Rainfall Data Gravity Data Gravity Station Gravity Change 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1997

Authors and Affiliations

  • Atsushi Mukai
    • 1
  1. 1.Department of Geophysics, Graduate School of ScienceKyoto UniversitySakyo-ku, KyotoJapan

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