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Pumping Induced Pore Pressure Changes in Tilt Measurements Near a Fault Zone in Mizunami, Japan

  • Matthias Queitsch
  • Gerhard Jentzsch
  • Adelheid Weise
  • Hiroshi Ishii
  • Yashuiro Asai
Conference paper
Part of the International Association of Geodesy Symposia book series (IAG SYMPOSIA, volume 139)

Abstract

Tilt meters are a widely used tool for monitoring long-term and small-scale deformations. Therefore, they are perfectly suited to test potential subsurface waste repositories. Since November 2005 a high sensitive tilt meter of the ASKANIA-type is recording at a distance of 300 m from Mizunami Underground Research Laboratory, where two vertical shafts are under construction. During the construction of those shafts large pumps were used to reduce the groundwater level, leading to two large- and several small-scale pore pressure induced tilt signals. Due to the fault system nearby, the tilt direction does not coincide with the direction towards the pump as would be expected in homogeneous media. In this study we analyze the main surface tilt direction caused by pore pressure induced deformation. Our results show two main directions which are both nearly perpendicular to the fault. Also, the long-term signals show a high correlation with the short-term pore pressure induced tilt signals.

Keywords

Tilt Hydrology Deformation Pore Pressure 

Notes

Acknowledgements

This research was only possible because of the good cooperation of the German and the Japanese sides: while the tilt meter was provided by the Geodynamic Observatory Moxa (Germany), the Japanese partners from TRIES were responsible for the borehole in the gallery as well as the maintenance of the instrument. From the Japanese side additional data were provided, including geologic and environmental information as well as data on the status of shaft construction. We also thank three anonymous reviewers for their helpful comments and suggestions.

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Matthias Queitsch
    • 1
  • Gerhard Jentzsch
    • 1
  • Adelheid Weise
    • 1
  • Hiroshi Ishii
    • 2
  • Yashuiro Asai
    • 2
  1. 1.Institute of GeosciencesJenaGermany
  2. 2.Tono Research Institute of Earthquake ScienceMizunamiJapan

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