Application of a combined source model for seismic discrimination. Technical report no. 21

Technical Report · Wed Oct 25 04:00:00 EDT 1978

OSTI ID:5852882

Hsiao, H Y.A.

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 rangge 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.

• Research Organization: Texas Instruments, Inc., Dallas (USA)
• OSTI ID: 5852882
• Report Number(s): AD-A-066919
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
450300* -- Military Technology
Weaponry
& National Defense-- Nuclear Explosion Detection
DETECTION
EARTHQUAKES
EXPLOSIONS
NUCLEAR EXPLOSION DETECTION
SEISMIC DETECTION
SEISMIC EVENTS
SEISMIC WAVES
UNDERGROUND EXPLOSIONS