Application of a Combined Source Model for Seismic Discrimination
Abstract
The purpose of this study has been to use the observed long-period teleseismic surface wave data of earthquakes and presumed underground explosions to determine the source mechanisms and to use these source mechanism estimates to discriminate between the two classes of events. In order to demonstrate this purpose, fifteen events have been selected and analyzed for the Russian Eastern Kazakh (EKZ) region, central and northern Eurasia, and the United States Nevada Test Site (NTS). The observation stations available for this study included the Seismic Research Observatories (SRO), Abbreviated Seismic Research Observatories (ASRO), the High Gain Long-Period (HGLP) stations (the same as the previous VLPE), and existing VELANET arrays. For a fair comparison of explosion and earthquake events, both have been treated in the same way by using the combined source model which combines a point explosive source and a point double-couple source. In order to cut down computer expenses and widen the searching range of some parameters, a binary exhaustive search method was applied to modify the amplitude spectral fitting process without any constraint. The results obtained from this modified process gave very good spectral fits for most events and lowered the minimum residual fitting error of each event.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 25, 1978
- Accession Number
- ADA066919
Entities
People
- Helmut Y. A. Hsiao
Organizations
- Texas Instruments