ARRAY RESEARCH. WAVENUMBER ANALYSIS OF TFO LONG-NOISE SAMPLE.

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 pe...

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Bibliographic Details
Main Authors: Binder, Frank H., Burg, John P.
Other Authors: TEXAS INSTRUMENTS INC DALLAS SCIENCE SERVICES DIV
Format: Text
Language:English
Published: 1966
Subjects:
Seismology
*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
NORTH PACIFIC OCEAN
NORTH ATLANTIC
SEISMIC ARRAYS
SEISMIC NOISE
VELA UNIFORM
Pacific
Strong Peak
Newfoundland
North Atlantic
Aleutian Islands
Online Access:http://www.dtic.mil/docs/citations/AD0803360
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0803360
Description
Summary: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)

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