Source depths utilizing broad-band data. Final report, 11 April 1985-28 February 1987

Technical Report · Thu Mar 19 00:00:00 EST 1987

OSTI ID:6028672

Sutton, G H; Carter, J A; Barstow, N

This report covers the effort of a two-year research project to improve the ability to discriminate between nuclear explosions and earthquakes based, on the depth of an event determined from local and regional phases. The approach taken was to provide phase identification and picking abilities for depth phases pp and sp through adaptive filtering to reduce effects of mode conversion and scattering. Three-component polarization methods are applied to broad-band digital data from a set of earthquakes located in the northeastern United States and from the short period records of the Ocean Sub-bottom Seismometer (OSS) for events in the Kuril/Kamchatka area. Data from the northeast U.S. are compared with suites of synthetic seismograms for different depths and focal mechanisms obtained using two velocity/attenuation models appropriate for northeastern United States and Canada. This comparison provides a basis for identification of the depth phases and discrimination of other reflected/refracted arrivals in the P wavetrain. Polarization state filtering (following procedures proposed by Samson) is used to emphasize those frequencies exhibiting the desired particle motion within a time that slides through the P wavetrain.

• Research Organization: Rondout Associates, Inc., Stone Ridge, NY (USA)
• OSTI ID: 6028672
• Report Number(s): AD-A-182030/7/XAB
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
58 GEOSCIENCES
EARTHQUAKES
SEISMIC DETECTION
NUCLEAR EXPLOSION DETECTION
DISCRIMINATORS
ATTENUATION
CONVERSION
DATA ACQUISITION
DEPTH
DIGITAL SYSTEMS
FILTERS
MOTION
PARTICLES
SCATTERING
VELOCITY
DETECTION
DIMENSIONS
ELECTRONIC CIRCUITS
SEISMIC EVENTS
450300* - Military Technology
Weaponry
& National Defense- Nuclear Explosion Detection
580201 - Geophysics- Seismology & Tectonics- (1980-1989)