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pure and applied geophysics

, Volume 129, Issue 3–4, pp 309–324 | Cite as

The mechanism of small mining tremors from amplitude inversion

  • Jan Šílený
Article

Abstract

A method of inverting seismic wave amplitudes from mining tremors is proposed to reveal their mechanism. A simple shear-implosive model of a mechanism is proposed. The shapes of theoretical and observed radiation patterns are compared in the least squares norm and the parameters describing the shear-slip together with the ratio of implosive and shear dislocations are optimized. The efficiency of the method, even in the case of a small number of stations, is demonstrated by applying it to weak mining tremors from two mine regions in Czechoslovakia.

The weak mining tremors are found to be of a predominantly shear mechanism with a clear coincidence of nodal planes to local tectonics, which could imply their tectonic nature.

Key words

Inversion ofP- andS-wave amplitudes weak mining tremors shear-implosive source model 

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Copyright information

© Birkhäuser Verlag 1989

Authors and Affiliations

  • Jan Šílený
    • 1
  1. 1.Geophysical InstituteCzechoslovakian Academy of SciencesPraha 4, SpořilovCzechoslovakia

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