Seismic event location at regional and teleseismic distances. Final report, 21 August 1990-31 December 1992
3-component data from Kazakhstan events were analyzed to model the structure and examine the use of secondary phases in event location. Including PmP decreases focal depth uncertainty. All but one of the events are concluded to be explosions; the remaining event is uncertain. Using this structure for the source region, we model nuclear explosions at KTS recorded at 4 stations in the distance range 600-1000 km using a modification of the generalized ray method with separate source and receiver structures. We match first arrivals within about 0.3 seconds, secondary phases within about a second, and obtain good fits to the waveform envelopes. Locations of nuclear explosions from 1987 to 1989 at Balapan, KTS, were derived with a precision of about 100 m from time-sequence satellite images and teleseismic epicenter estimates. Ground control points for rectification were obtained from information on explosions in Bocharov et al. (1989). Fresh disturbances in satellite images are associated with individual explosions. ne seismic locations have error estimates that are too small: in 80% of cases, events lie outside the error ellipses. Our effort was extended to the analysis of LANDSAT images. We have identified nearly all explosion sites from 1973 through 1985. Kazakhstan, Crustal structure, Synthetic seismograms, Regional seismic waves, Event location, Satellite images.
- Research Organization:
- Wisconsin Univ., Madison, WI (United States)
- OSTI ID:
- 6070552
- Report Number(s):
- AD-A-266873/9/XAB; CNN: F19628-90-K-0047
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
450300* -- Military Technology
Weaponry
& National Defense-- Nuclear Explosion Detection
ASIA
DATA
DATA COVARIANCES
DEPTH
DETECTION
DIMENSIONS
DISTANCE
DISTURBANCES
EPICENTERS
EXPLOSIONS
IMAGE PROCESSING
IMAGES
INFORMATION
KAZAKHSTAN
MEASURING INSTRUMENTS
NUCLEAR EXPLOSION DETECTION
NUCLEAR EXPLOSIONS
NUMERICAL DATA
PROCESSING
REGIONAL ANALYSIS
SATELLITES
SEISMIC ARRAYS
SEISMIC DETECTORS
SEISMIC WAVES
SEISMOGRAPHS
STATISTICAL DATA
WAVE FORMS