Accession Number:

AD0739175

Title:

Alaskan Noise Field Investigation, March to June 1971

Descriptive Note:

Technical rept.

Corporate Author:

TELEDYNE GEOTECH GARLAND TX

Personal Author(s):

Report Date:

1972-01-17

Pagination or Media Count:

56.0

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.

Descriptors:

• *SEISMIC WAVES
• ALASKA
• EARTHQUAKES
• NETWORKS
• NOISE
• NUCLEAR EXPLOSIONS
• POWER SPECTRA
• PRESSURE
• SAMPLING
• SEISMOMETERS
• SIGNAL TO NOISE RATIO
• SPECTRUM ANALYZERS

Subject Categories:

• Seismology

Distribution Statement:

APPROVED FOR PUBLIC RELEASE