pure and applied geophysics

, Volume 114, Issue 3, pp 415–423 | Cite as

Effect of dilatancy on ocean load tides

  • Torao Tanaka
Article

Summary

The decrease in elastic constants due to dilatancy in the earth's crust may bring about changes of its loading response to ocean tides. The amount of change is estimated by two-dimensional finite element analysis. The results show that if a dilatant zone of thicknessd underneath a coastline extends seaward and under the land, then amplitude changes will be detectable at distances 3d andd inland for strain and tilt tides, respectively. An anisotropic decrease of elastic constants in the vertical direction only will reduce the range by one half at most for strain tides especially.

Keywords

Finite Element Analysis Vertical Direction Elastic Constant Amplitude Change Ocean Tide 
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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References

  1. C. Beaumont andJ. Berger (1974),Modification of the earth tide tilts and strains by dilatancy, Geophys. J. R. astr. Soc.39, 111–121.Google Scholar
  2. B. P. Bonner (1974),Shear wave birefringence in dilating granite, Geophys. Res. Lett.1, 217–220.Google Scholar
  3. I. N. Gupta (1973),Premonitory variations in S-wave velocity anisotropy before earthquakes in Nevada, Science182, 1129–1132.Google Scholar
  4. E. Nishimura (1950),On earth tides, Trans. Amer. Geophys. Union31, 357–376.Google Scholar
  5. E. Nishimura (1956),On change of state of the materials in the earth's crust with relation to seismic activity, Memorial Issue of the Fifth Anniversary, Disast. Prev. Res. Inst., Kyoto Univ., 8–13.Google Scholar
  6. C. H. Scholz, L. R. Sykes andY. P. Aggarwal (1973),Earthquake prediction: A physical basis, Science181, 803–810.Google Scholar
  7. T. Tanaka (1973),Tidal tilts and strains, and oceanic tides (Part 3). J. Geod. Soc. Japan19, 85–92.Google Scholar
  8. T. Tanaka andM. Kato (1974),On the change of crustal elasticity and earth tides, J. Geod. Soc. Japan20, 125–132.Google Scholar
  9. J. H. Whitcomb, J. D. Garmany andD. L. Anderson (1973),Earthquake prediction: Variation of seismic velocities before the San Fernando earthquake, Science180, 632–635.Google Scholar

Copyright information

© Birkhäuser Verlag 1976

Authors and Affiliations

  • Torao Tanaka
    • 1
  1. 1.Cooperative Institute for Research in Environmental SciencesUniversity of Colorado/NOAABoulderUSA

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