Relationships between Ocean Bottom Noise and the Environment.

Observations of ocean bottom low frequency noise and surface environmental data over a period of 27 days in the North Atlantic during the SAMSON and SWAE experiments reveal how closely related the noise is to meteorological conditions. Double frequency microseisms produced by nonlinear interactions...

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Bibliographic Details
Main Authors: Babcock, Jeffrey M., Kirkendall, Barry A., Orcutt, John A.
Other Authors: SCRIPPS INSTITUTION OF OCEANOGRAPHY LA JOLLA CA
Format: Text
Language:English
Published: 1995
Subjects:
Physical and Dynamic Oceanography
Seismology
*AMBIENT NOISE
*NORTH ATLANTIC OCEAN
*OCEAN BOTTOM
*MICROSEISMS
PEAK VALUES
OCEAN WAVES
OCEAN SURFACE
TIME DEPENDENCE
COHERENCE
OCEANOGRAPHIC DATA
BATHYMETRY
SEISMIC DATA
FREQUENCY BANDS
NONLINEAR SYSTEMS
SEASONAL VARIATIONS
LONG RANGE(DISTANCE)
STORMS
SEISMIC WAVES
WIND VELOCITY
AIR WATER INTERACTIONS
MARINE METEOROLOGY
OCEAN ENVIRONMENTS
SEISMOGRAPHS
TELESEISMIC WAVES
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/ADA296051
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=ADA296051
Description
Summary:Observations of ocean bottom low frequency noise and surface environmental data over a period of 27 days in the North Atlantic during the SAMSON and SWAE experiments reveal how closely related the noise is to meteorological conditions. Double frequency microseisms produced by nonlinear interactions of storm-induced surface gravity waves are especially evident in the frequency band O.16-0.3 Hz and show a high variability in both amplitude and peak frequencies. Bifurcated at times, the peak which characterizes the microseism band contains local and distant or teleseismic components which are generated at different locations. Weather and storm fetch appear to be the major contributors to the size and shape of microseism spectra. Storm development on the sea surface is associated with progressively lower microseism frequencies along with a concurrent increase in amplitude. The single frequency microseism peak is a continuous feature and is observed to portray the same time-dependent spectral characteristics as the portion of the double frequency peak associated with distant storms. Coherence studies confirm that both peaks (single and teleseismic double) originate at a distant source. These peaks are generated at roughly the same location with some storm component over the coastline. (AN)

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