Source Studies in the Near and Far Field
Abstract
A program has been undertaken to examine the seismic source in the near- and far-fields. Near field accelerogram spectra have been analyzed for corner frequency, seismic moment, and stress drop. For the Bear Valley earthquake of June 22, 1973, a stress drop of 300 bars was obtained using Brune's source theory. The data sample, though, was insufficient to determine any empirical relationship between corner frequency and local magnitude and its association with stress drop. In our examination of far-field source spectral characteristics, de-multipathing procedures have been implemented on the PDP-15 interactive graphics system. Three-dimensional computer plots of double couple source spectra have been produced, and are being used in an exhaustive analysis of far-field spectral characteristics as a function of source configuration.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 30, 1974
- Accession Number
- ADA005786
Entities
People
- David Sun
- James C. Battis
- Lawrence S. Turnbull
Organizations
- Texas Instruments