Alaskan Noise Field Investigation, March to June 1971

Abstract

Noise in the 50-60 second period range, recorded by the Alaskan Long- Period Array during the winter months, was found to be caused by convection cells within the array boreholes. A technique for preventing formation of the cells was devised. Burial of ALPA seismometers was found to significantly reduce wind-generated horizontal seismic noise. Relationships between triaxial module pressure sensitivities and module installation techniques and between pressure sensitivity and module tilt were studied.

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Document Details

Document Type
Technical Report
Publication Date
Jan 17, 1972
Accession Number
AD0739175

Entities

Organizations

  • Teledyne Technologies

Tags

Communities of Interest

  • Advanced Electronics
  • Energy and Power Technologies
  • Sensors

DTIC Thesaurus Topics

  • Air Pressure
  • Background Noise
  • Barometric Pressure
  • Boreholes
  • Construction
  • Convection
  • Dielectric Polymers
  • Films
  • Insulation
  • Measurement
  • Noise
  • Noise Reduction
  • Pressure Measurement
  • Sine Waves
  • Temperature Gradients
  • Test And Evaluation
  • Wind Velocity

Fields of Study

  • Environmental science

Readers

  • Acoustics.
  • Polar and Arctic Studies
  • Seismology