By Renata Dmowska (ed.), Barry Saltzman (ed.)

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1989) were characterized by a non-double-couple, possibly implosional, mechanism and were determined to be predominantly below mine level. Wong et al. (1989) conclude that a possible focal model for these events may involve shear-implosional displacements as proposed by Rudajev and Sileny (1985). However, it is rather difficult to imagine a plausible mechanism with an implosional component at considerable depth below the mine level. A combined shear-tensional and shear-implosional mechanism has been proposed by Teisseyre (1980), who introduced a qualitative source model with consecutive propagation of both dislocations to describe the non-doublecouple behavior observed from earthquakes and mine tremors.

Lower hemisphere, equal-area projections are used. Triangles indicate P- and Faxes and alternative slip vectors; H is the focal depth and M is magnitude. 6 km below datum. , 1986). , 1986; Sileny, 1986), and the calculated maximum S-wave amplitudes were compared with those observed from tremors in the Karvina coal mining area, Czechoslovakia (Sileny, 1989). Figure 18, reproduced from 30 SLAWOMIR J. GIBOWICZ * ; * * * * P IC 1A 7 * * * P TENSILE CRACK t t t FIG. 16. Laboratory simulation of a tectonic fault under uniaxial compression P, inclined at an angle to the compression direction.

Thesis, University of Witwatersrand, Johannesburg, 1980) to previous studies of the moment tensor of mine tremors, which failed to indicate a consistent component of volume changes. Sat0 and Fujii (1989) have studied the source mechanism of a large-scale gas outburst at Sunagawa coal mine in Japan, which occurred in January 1986. They introduced a new method to evaluate the seismic moment tensor in the frequency domain and applied it to 15 seismic events recorded by the mine underground seismic network.

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