Accession Number : AD0803360
Title : ARRAY RESEARCH. WAVENUMBER ANALYSIS OF TFO LONG-NOISE SAMPLE.
Descriptive Note : Special rept.,
Corporate Author : TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICES DIV
Personal Author(s) : Binder, Frank H. ; Burg, John P.
Report Date : 15 SEP 1966
Pagination or Media Count : 19
Abstract : This report presents some wavenumber spectra of ambient noise recorded at Tonto Forest Observatory which showed exceptional simplicity. The coherent noise showed a very strong peak corresponding to a directional surface-mode wavetrain with frequency of about 0.2 cps, and two strongly concentrated peaks of body-wave energy which were stable over a fair bandwidth (0.75 < or = f < or = 1 + cps). These peaks in the wavenumber spectrum appear to be related to two strong storms, one in the North Atlantic just off the coast of Newfoundland and the other in the North Pacific, south of the Aleutians. These wavenumber spectra indicate that body-wave noise can be highly concentrated in f-k(vector) space and that large ocean storms may be a significant contributor to body-wave noise. The results suggest that body-wave noise might be expected to be nonisotropic and time-variant. (Author)
Descriptors : *SEISMOLOGICAL STATIONS), (*SEISMIC WAVES, ARIZONA, ATLANTIC OCEAN, PACIFIC OCEAN, UNDERGROUND EXPLOSIONS, NUCLEAR EXPLOSIONS, DETECTION, STORMS, NOISE, BACKGROUND, BANDWIDTH, TIME, ENERGY, NEWFOUNDLAND(PROVINCE), ALEUTIAN ISLANDS, METEOROLOGICAL CHARTS, TRANSFORMATIONS(MATHEMATICS), FOURIER ANALYSIS, DENSITY, LOW FREQUENCY, MICROSEISMS.
Subject Categories : Seismology
Distribution Statement : APPROVED FOR PUBLIC RELEASE