Phase- and spectral-ratio discrimination in North America. Volume 2. Final report, 16 Apr 89-15 Jul 91

Technical Report · Thu Jul 18 04:00:00 EDT 1991

OSTI ID:5518621

Lynnes, C; Baumstark, R

Spectral and phase ratios were computed for regional phases from explosion and earthquakes in the southwestern U.S., mid-Atlantic U.S. and southeastern Canada. For each region, empirical distance corrections, which generally agree with expectations from attenuation, were applied. Pg and Lg spectral ratios (1-2 Hz/4-8 Hz) and Pg/Lg ratios in the southwestern U.S. are sensitive to source-receiver path, and to explosion shot depth. In this region, Pg and Lg spectral ratios differentiate explosions from earthquakes, while Pg/Lg ratios are less successful. In southeastern Canada, P/Lg ratios show some discrimination capabilities but spectral ratios of both P and Lg fail to distinguish event type. In the mid-Atlantic U.S., both spectral and phase ratios contain information about the event type. The regional differences in efficacy of spectral and phase ratios suggest that the transportability of high-frequency regional phase discriminants is problematic.

• Research Organization: Teledyne Geotech, Alexandria, VA (United States). Alexandria Labs.
• OSTI ID: 5518621
• Report Number(s): AD-A-246673/8/XAB; TGAL--91-06; CNN: F19628-89-C-0063
• 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
58 GEOSCIENCES
580000 -- Geosciences
ATTENUATION
CANADA
CORRECTIONS
DEPTH
DETECTION
DEVELOPED COUNTRIES
DIMENSIONS
DISTANCE
EARTHQUAKES
EXPLOSIONS
NORTH AMERICA
PHASE VELOCITY
SEISMIC DETECTION
SEISMIC EVENTS
SEISMIC WAVES
SENSITIVITY
SPECTRA
USA
VELOCITY