Technical report for the period 1 October-31 December 1986

Technical Report · Sun Feb 01 04:00:00 EST 1987

OSTI ID:6150212

Work on network design and capability assessment focused on defining the seismological criteria for selecting stations of a global seismic network to achieve a specified minimum verification capability. The design criteria are defined with a view toward minimizing the gap between seismic-detection threshold and the threshold for recording seismic waves used for discriminating earthquakes from nuclear explosions. Research to improve analysis of regional seismic data is currently focused on determining various waveform signatures of events that occur frequently at the same location. Examples being studied include repeated explosions at mines in the western USSR and Scandinavia, presumed underwater detonations off the coast of Norway, and northern European earthquake sequences. Procedures being tested as seismic signature elements include the formation of particle-motion parameters from the six terms of the three-component covariance matrix, plus spectral and autoregressive analyses. A review of evidence for high-quality propagation of seismic waves at regional distance ranges in the USSR was conducted. The available data are consistent with maximum Q/sub a/ of about 2000 for regional seismic waves. In both the Baltic shield and central Asia, high-frequency signals from small events are observed to about 500-600 km, but disappear into the noise at larger distance ranges.

• Research Organization: Science Applications International Corp., Arlington, VA (USA). Center for Seismic Studies
• OSTI ID: 6150212
• Report Number(s): AD-A-179377/7/XAB; SAIC-87/1584
• 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
580201 -- Geophysics-- Seismology & Tectonics-- (1980-1989)
ASIA
BALTIC SEA
COASTAL REGIONS
DETECTION
EARTHQUAKES
EASTERN EUROPE
EUROPE
EXPLOSIONS
MEASURING INSTRUMENTS
MONITORING
NORWAY
NUCLEAR EXPLOSION DETECTION
POLARIZATION
RECORDING SYSTEMS
SCANDINAVIA
SEAS
SEISMIC ARRAYS
SEISMIC DETECTION
SEISMIC EVENTS
SEISMOLOGY
SIGNALS
SURFACE WATERS
UNDERWATER EXPLOSIONS
USSR
WESTERN EUROPE