LASA SIGNAL AND NOISE AMPLITUDES FOR THREE TELESEISMIC EVENTS.

Signal amplitudes, noise levels (rms), and signal-to-noise ratios were computed from LASA recordings (1325 seismograms) of three teleseismic events; in addition, unphased and phased subarray summations were formed. The results of this study indicate that signal amplitudes with in a subarray vary by...

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Bibliographic Details
Main Authors: Chiburis, Edward F., Hartenberger, Royal A.
Other Authors: TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV
Format: Text
Language:English
Published: 1966
Subjects:
Seismology
*SEISMIC WAVES
*SEISMOGRAPHS
STATISTICAL ANALYSIS
DATA PROCESSING
EARTHQUAKES
ARGENTINA
ALASKA
SIBERIA
DIGITAL RECORDING SYSTEMS
UNDERGROUND ANTENNAS
SIGNAL TO NOISE RATIO
NOISE
MONTANA
MAGNETIC TAPE
KAMCHATKA PENINSULA
LASA(LARGE APERTURE SEISMIC ARRAY)
Argentina
Kamchatka Peninsula
Kamchatka
Alaska
Siberia
Online Access:http://www.dtic.mil/docs/citations/AD0485032
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0485032
Description
Summary:Signal amplitudes, noise levels (rms), and signal-to-noise ratios were computed from LASA recordings (1325 seismograms) of three teleseismic events; in addition, unphased and phased subarray summations were formed. The results of this study indicate that signal amplitudes with in a subarray vary by a factor of three or four and tat there is an equivalent variation is subarray mean amplitudes across the entire LASA. Noise levels, on the other hand, are fairly uniform across LASA for a given event. Phased signal amplitudes within a subarray are about 2 db better than their corresponding unphased sums, but they are slightly smaller than the mean signal amplitudes. Both phased and unphased noise leveles within a subarray are approximately 6db lower than the subarray mean. (Author)

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