Spectral Properties and Source Areas of Storm Microseisms at NORSAR

Abstract

Spectral estimates from eight microseismic storms recorded by long period vertical component seismometers at NORSAR exhibit distinct spectral peaks in the bands 50-85 mHz and 110-195 mHz. A high frequency third peak (180-250 mHz) is also resolvable in some cases. High resolution frequency wave-number analysis of the storm microseisms yield azimuthal estimates which are accordant with meteorological disturbances over both the North Atlantic Ocean and the Norwegian Sea. The early stages of a typical storm development are characterized by a relatively concentrated microseismic source area to the west of NORSAR, whereas later on the source area expands and new sources appear to the NW and to the north of NORSAR. Simultaneously the spectral peaks migrate towards higher frequencies.

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Document Details

Document Type
Technical Report
Publication Date
Feb 03, 1976
Accession Number
ADA021450

Entities

People

  • H. Korhonen
  • S. E. Pirhonen

Organizations

  • Royal Norwegian Council for Scientific and Industrial Research

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Arrays
  • Atlantic Ocean
  • Contracts
  • Data Analysis
  • Frequency
  • Frequency Bands
  • High Resolution
  • North Atlantic Ocean
  • Norwegian Sea
  • Oceans
  • Phase Velocity
  • Power Levels
  • Power Spectra
  • Seismic Arrays
  • Seismology
  • Waves
  • Wind Velocity

Fields of Study

  • Environmental science

Readers

  • Radar Systems Engineering.
  • Seismology
  • Space/Atmospheric Physics.