Quantification of m(Lg) for Small Explosions
Final rept. 5 Jul 1990-31 Dec 1992
SAINT LOUIS UNIV MO DEPT OF EARTH AND ATMOSPHERIC SCIENCES
Pagination or Media Count:
This report focuses on regional wave propagation with application to the discrimination problem between explosions and earthquakes. Since discrimination is not trivial for small events, understanding of seismic wave propagation and seismic sources is essential. The report begins by completely presenting seismic wave propagation theory for plane layers in an isotropic media. Topics such as propagator matrix stability, wavenumber integration and periodicity of the discrete Fourier transform are addressed. The next topic discusses the differences between small explosions and earthquakes of the same magnitude. The investigation indicates that chemical mining explosions have low excitation of high frequencies compared to point sources, such as earthquakes. Finally, the use of the short-period surface wave as a depth indicator is discussed.