Spectral Evidence for Source Multiplicity in Explosions
Abstract
Spectral and cepstral analysis were performed on regional-array NORESS recordings of mining explosions in Scandinavia and Russia in order to detect the effects of delayed explosions (ripple firing), commonly used in mine- blasting practice. NORESS stack spectra were computed in windows on Pn, Pg, Sn, and Lg by averaging individual channel spectra, frequency by frequency, across the array. The stack spectra were then corrected for instrument response and noise. For comparison, spectra were also computed for six western Norway earthquakes located near the Blasjo and Titania Norwegian mines. Also, stack spectra of P coda, Sn, and Lg were computed using NORSAR seismograms for presumed PNEs located at near regional distances (delta = 10 degrees) in western Russia. The NORSAR spectra were determined in the same manner as the NORESS spectra, except that an additional source correction was applied to the spectra.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1987
- Accession Number
- ADA187363
Entities
People
- Douglas R. Baumgardt
- Kathleen A. Ziegler