Discrimination studies using short-period P waves at upper mantle distances. Annual report, January 1986-January 1987
Technical Report
·
OSTI ID:6774923
This report reviews the properties of seismograms recorded at upper mantle distances in stable continental region such as northwest Eurasia in order to examine how well current models predict the general behavior of the observations and to see how much unmodeled energy, or noise, is present. In general The proposed models for the region predict the major arrivals observed in the data. For explosions, there are few distinct arrivals that are not associated with some predicted upper mantle phase. However, noise levels (or code amplitudes), are large, since each arrival has a code associated with it that adds constructively at the receiver. Use predicted coda amplitudes, in a Pearce algorithm to discriminate on the basis of focal mechanism. Given good azimuthal coverage of an event (e.g., 3 of 4 quadrants), the observed complexity of the explosion seismograms is incompatible with that predicted for earthquakes at depth using simple models for the reflection of the depth phases pP and sP. These results are similar to previous findings that considered teleseismic data.
- Research Organization:
- Sierra Geophysics, Inc., Kirkland, WA (USA)
- OSTI ID:
- 6774923
- Report Number(s):
- AD-A-195468/4/XAB; SGI-R-88-136
- Country of Publication:
- United States
- Language:
- English
Similar Records
Upper mantle structure of northwestern Eurasia
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·
Tue Dec 09 23:00:00 EST 1980
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OSTI ID:7064136
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Journal Article
·
Mon Sep 10 00:00:00 EDT 1979
· J. Geophys. Res.; (United States)
·
OSTI ID:5912244
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·
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·
OSTI ID:5560808
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)
ALGORITHMS
AZIMUTH
DEPTH
DETECTION
DIMENSIONS
DOCUMENT TYPES
EARTH MANTLE
EARTHQUAKES
EXPLOSIONS
FOCUSING
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MONITORING
NOISE
NUCLEAR EXPLOSION DETECTION
PROGRESS REPORT
SEISMIC DETECTION
SEISMIC EVENTS
SEISMIC P WAVES
SEISMIC WAVES
STABILITY
UNDERGROUND EXPLOSIONS
450300* -- Military Technology
Weaponry
& National Defense-- Nuclear Explosion Detection
58 GEOSCIENCES
580201 -- Geophysics-- Seismology & Tectonics-- (1980-1989)
ALGORITHMS
AZIMUTH
DEPTH
DETECTION
DIMENSIONS
DOCUMENT TYPES
EARTH MANTLE
EARTHQUAKES
EXPLOSIONS
FOCUSING
MATHEMATICAL LOGIC
MATHEMATICAL MODELS
MONITORING
NOISE
NUCLEAR EXPLOSION DETECTION
PROGRESS REPORT
SEISMIC DETECTION
SEISMIC EVENTS
SEISMIC P WAVES
SEISMIC WAVES
STABILITY
UNDERGROUND EXPLOSIONS