SEISMIC NOISE STRUCTURE AT THE NORWEGIAN SEISMIC ARRAY,

Abstract

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.

Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1969
Accession Number
AD0702825

Entities

People

  • Eivind Rygg
  • Hilmar Bungum
  • Leif Bruland

Organizations

  • University of Bergen

Tags

Communities of Interest

  • Sensors

DTIC Thesaurus Topics

  • Arrays
  • Atlantic Ocean
  • Baltic Sea
  • Bodies Of Water
  • Frequency
  • Frequency Shift
  • Landforms
  • North Atlantic Ocean
  • Oceans
  • Seismic Arrays

Readers

  • Seismology
  • Theoretical Analysis.

Technology Areas

  • Space