A Long-Period Noise Study at Murphy Dome, Alaska (LRSM Site FB-AK and ALPA Site 3-4)

Long-period signals and noise samples recorded at Murphy Dome, Alaska, on standard LRSM instruments and the Geotech triaxial seismometer were subjected to spectral analysis. System noise tests showed that recorded seismic noise was limited to a band from .02 to 0.3 cps. Spectra representing many rec...

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Bibliographic Details
Main Author: Von Seggern, D H
Format: Report
Language:English
Subjects:
ALASKA
BACKGROUND
DETECTION
EARTHQUAKES
LONG PERIOD SEISMOMETERS
MURPHY DOME(ALASKA)
NETWORKS
NOISE
NUCLEAR EXPLOSIONS
POWER SPECTRA
Seismic Detection and Detectors
SEISMIC NOISE
SEISMIC WAVES
SEISMOLOGICAL STATIONS
Seismology
SEISMOMETERS
SIGNAL TO NOISE RATIO
SPECTRUM SIGNATURES
TRIAXIAL SEISMOMETERS
UNDERGROUND EXPLOSIONS
VELA UNIFORM
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Summary:Long-period signals and noise samples recorded at Murphy Dome, Alaska, on standard LRSM instruments and the Geotech triaxial seismometer were subjected to spectral analysis. System noise tests showed that recorded seismic noise was limited to a band from .02 to 0.3 cps. Spectra representing many recording periods between January and August 1969 revealed the background noise to be of variable character and the RMS to range from 2.5 millimeters to 5.2 millimeters on a trace magnified 100,000 times with the standard LRSM system response. Due to its location at depth the triaxial instrument significantly reduced background noise on horizontal components caused by atmospheric pressure changes. Coherence between triaxial components of motion and corresponding LRSM components was excellent for most signals analyzed.