Effects of travel path and source structure on the character of regional distance seismograms from nuclear explosions. Final report, October 1989-February 1992

Technical Report · Fri Dec 27 04:00:00 EST 1991

OSTI ID:6901868

Wallace, T C

A comprehensive or low-yield threshold test treaty will require monitoring at regional distances, and the seismograms are very difficult to deterministically model. The character of the phases Pg and Lg shows a very strong dependence on travel path. We have conducted a number of observation-based experiments to develop empirical path corrections or scaling relations for regional phase excitation and propagation. The gross crustal structure of the western syntaxis was determined and the blockage of Pg and Lg in the region was studied empirically. Eighteen events from the 1986 Chalfant Valley earthquake sequence were used to examine the effects of source magnitude, depth, and rock properties on the regional distance spectra of Pg, Lg, and Pn. For all three variables, the spectral ratios discriminant behaves in a linear fashion. We also reviewed the effects of tectonic release on seismic body waves generated by underground nuclear explosions.

• Research Organization: Arizona Univ., Tucson, AZ (United States). Dept. of Geosciences
• OSTI ID: 6901868
• Report Number(s): AD-A-256678/4/XAB; CNN: F19628-89-K-0023
• 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
ASIA
DEPTH
DETECTION
DEVELOPING COUNTRIES
DIMENSIONS
EARTH CRUST
EARTHQUAKES
EVALUATION
EXPLOSIONS
INDIA
MEASURING INSTRUMENTS
NUCLEAR EXPLOSION DETECTION
NUCLEAR EXPLOSIONS
SEISMIC ARRAYS
SEISMIC DETECTORS
SEISMIC EVENTS
SEISMIC WAVES
SEISMOGRAPHS
SEISMOLOGY
TECTONICS
UNDERGROUND EXPLOSIONS
VELOCITY
WAVE PROPAGATION