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

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

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The eigenvectors of the moment tensor give the directions of the principal stress axes and the eigenvalues provide their magnitudes. The point-source approximation is valid for the long period displacementthe fault-plane dimensions are assumed to be shorter than the wavelength of the seismic waves used in the analysis. , Saikia and Herrmann, 1986; Sipkin, 1986). , 1987): Am=u (1) where m = {M,,, M12,M,,, MI3,M23, M33} is the vector containing the six components of the moment tensor, u is the vector of the observed amplitudes, and the matrix A accounts for the transfer and excitation functions for P, SH, SEISMICITY INDUCED BY MINING 33 or SV waves.

The uncorrected spectra are often characterized by a decay coefficient distinctly higher than the most often observed value of 2. , 1990). The simplest and most often used spectral model is that described by the lowfrequency spectral level R, and the corner frequency f,, above which the spectrum is assumed to fall off as a second power of the frequency (Aki, 1967; Brune, 1970, 1971). , 1983). For this reason Snoke (1987) has recently proposed replacingf, as a spectral observable by a parameter which can be determined reliably, providing a more robust procedure than that conventionally used.

The uncorrected spectra are often characterized by a decay coefficient distinctly higher than the most often observed value of 2. , 1990). The simplest and most often used spectral model is that described by the lowfrequency spectral level R, and the corner frequency f,, above which the spectrum is assumed to fall off as a second power of the frequency (Aki, 1967; Brune, 1970, 1971). , 1983). For this reason Snoke (1987) has recently proposed replacingf, as a spectral observable by a parameter which can be determined reliably, providing a more robust procedure than that conventionally used.

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