pure and applied geophysics

, Volume 123, Issue 1, pp 59–80

Design parameters for borehole strain instrumentation

  • Michael T. Gladwin
  • Rhodes Hart
Article

DOI: 10.1007/BF00877049

Cite this article as:
Gladwin, M.T. & Hart, R. PAGEOPH (1985) 123: 59. doi:10.1007/BF00877049

Abstract

The response of a borehole strain meter to hydrostatic and shear deformations in an isotropic medium is calculated to facilitate optimum instrument design and produce instrument response factors for parameters typically encountered in installed instruments. Results for an empty borehole are first compared with results for an instrument in intimate contact with the surrounding rock. The effects of the grout used to install the instrument are then examined. Where possible, analytic forms for the response factors are given. Results for typical installations are then presented in graphical form for optimizing instrument design in an environment of known elastic parameters. Alternatively, the results may be applied in the measurement of unknown strain signals, to correct for instrument response or to provide in-situ estimates of the elastic properties of the environment by examination of observed strain response to known strain signals.

Key words

Borehole strainstrain monitoringshear stranearthquake strain

Copyright information

© Birkhäuser Verlag 1985

Authors and Affiliations

  • Michael T. Gladwin
    • 1
  • Rhodes Hart
    • 1
  1. 1.Department of PhysicsUniversity of QueenslandSt. LuciaAustralia