LASA SIGNAL AND NOISE AMPLITUDES FOR THREE TELESEISMIC EVENTS.

• 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

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)