SEISMIC NOISE STRUCTURE AT THE NORWEGIAN SEISMIC ARRAY

Power spectral analysis in frequency-wavenumber space and coherence studies in lag space have shown that the noise recorded by the short period 12 sensor subarray at NORSAR is critically dependent on the weather situation in the North Atlantic Ocean. In addition to the low frequency noise from the w...

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Bibliographic Details
Main Authors: Bungum,Hilmar, Bruland,Leif, Rygg,Eivind
Other Authors: BERGEN UNIV (NORWAY) SEISMOLOGICAL OBSERVATORY
Format: Text
Language:English
Published: 1969
Subjects:
Seismology
(*SEISMOLOGICAL STATIONS
NOISE)
POWER SPECTRA
SEISMOMETERS
PHASED ARRAYS
MICROSEISMS
INTEGRAL TRANSFORMS
BALTIC SEA
NORWAY
*NORSAR(NORWEGIAN SEISMIC ARRAY)
*NORWEGIAN SEISMIC ARRAY
*SEISMIC NOISE
SHORT PERIOD SEISMOMETERS
Norway
North Atlantic
Online Access:http://www.dtic.mil/docs/citations/AD0702825
http://oai.dtic.mil/oai/oai?&verb=getRecord&metadataPrefix=html&identifier=AD0702825
Description
Summary:Power spectral analysis in frequency-wavenumber space and coherence studies in lag space have shown that the noise recorded by the short period 12 sensor subarray at NORSAR is critically dependent on the weather situation in the North Atlantic Ocean. In addition to the low frequency noise from the west, there is observed 2 second microseisms from the Baltic Sea. Because of the non-isotropic noise, the coherence is usually strongly azimuthal dependent, being represented in lag space by ellipses. Time variations of the coherence by a factor of 5 are easily observed.

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