Deterministic Methods of Seismic Source Identification
Abstract
This report emphasizes results from completed research in seismic wave attenuation. We also describe and illustrate current signal analysis methods using a variety of seismic time series data. The results reported include relative amplitudes, at a large number of standardized seismic stations in the U.S. and Southern Canada, for a large number of explosions and earthquakes observed at three fixed azimuths for many stations. The average Qa at 1 Hz, for the upper 300 km of the crust-mantle beneath the study area varies from about 65 at Golden, Colorado to about 2000 at Red Lake, Ontario. The mean Qa is 140 for the continental U.S. Other work completed has provided new, high resolution, Q determinations from low order free oscillation excitation, and these results provide strong constraints on lower mantle attenuation. We describe new signal analysis methods devised for use in automatic discrimination and yield estimation in a multivariant approach. In this context we have the current ability to rapidly and automatically obtain spectral magnitudes for a large number of seismic phases, which can be used in both teleseismic and regional discrimination and for yield estimation.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1983
- Accession Number
- ADA127477
Entities
People
- Charles B. Archambeau