ON ESTIMATING EXPLOSIVE SOURCE PARAMETERS AT TELESEISMIC DISTANCES
Abstract
A study has been made of the short period spectra of five presumed explosions recorded at five arrays. An attempt has been made to relate contrasts in spectra of different events recorded at the same site, to source size; and contrasts observed at different arrays for a given event, to the earth's attenuative properties. Haskell's model for the explosion spectrum was fitted to each event individually after corrections for instrument response and various exponential attenuations. At a single array, that attenuation which allowed the fitted parameters to vary as dictated by the model was chosen as the correct one. With the attenuation estimated to each array, the spectra observed at all the arrays for a single event are fitted to a source model simultaneously. In most cases the individual and simultaneous fitting schemes yield reasonable values for the source parameters. Haskell's model and the estimated attenuation parameter for a central Asia to LASA path apparently explains a trend in short period spectral ratio measurements as a function of magnitude.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jul 08, 1970
- Accession Number
- AD0709767
Entities
People
- John R. Filson
Organizations
- Massachusetts Institute of Technology