Advances in Geophysics, Vol. 32 by Renata Dmowska (ed.), Barry Saltzman (ed.)

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

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15. Alternative fault-plane solutions for seismic events with all dilatational (open circles) P-wave first motions, recorded in the East Mountain coal mining area, Wasatch Plateau, Utah during June- August 1984. 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).

5. 84-07-12 H=O 1 K M 3 bt 0 , 2 8 43 - 0 70 - 12 ' R T. 67N S O L U T I O N 16 a M-0 9. 84-07-21 0 KM b M = O 5. 63 5 W FIG. 15. Alternative fault-plane solutions for seismic events with all dilatational (open circles) P-wave first motions, recorded in the East Mountain coal mining area, Wasatch Plateau, Utah during June- August 1984. 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.

Logarithm of P-wave energy versus logarithm of S-wave energy for small tremors observed at the Heinrich Robert coal mine, Federal Republic of Germany, in 1987 and 1988. The values of the ratio of P-wave over S-wave energy are indicated by straight lines. ) The seismic efficiency of mine tremors, that is, the ratio of the seismic energy to the total energy released during rupture processes, seems to be very low. 24%. , 1979). The strain energy released during faulting is consumed in heat, seismic waves, and microstructural defects formed during crushing.

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