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

reportActive / Technical Report | Accession Number: AD0864172 | Open PDF

Abstract:

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.

Author(s):
Von Seggern, D. H.
Author Organization(s):
TELEDYNE INDUSTRIES INC ALEXANDRIA VA EARTH SCIENCES DIV
Descriptive Note:
Seismic data lab rept.
Pagination:
0064

Security Markings

DOCUMENT & CONTEXTUAL SUMMARY

Distribution:
Approved For Public Release
Distribution Statement:
Approved For Public Release; Distribution Is Unlimited.

RECORD

Collection: TR
Identifying Numbers
Report Number(s):
SDL-247
Contract/Grant Number(s):
F33657-69-C-0913, ARPA ORDER-624
Project Number(s):
VT/9706
Monitor Series:
DARPA
 Subject Terms
Joint Capability Areas:
JCA_6.3.3_Spectrum Management; JCA_6.3_Net Management; JCA_6_Net Centric; JCA_8_Building Partnerships; JCA_8.2_Shape; JCA_3_Force Application; JCA_5.3_Planning; JCA_5_Command and Control; JCA_3.2_Engagement; JCA_8.1_Communicate; JCA_3.2.1_Kinetic Means; JCA_8.2.1_Partner with Governments and Institutions
Communities of Interest:
Energy and Power Technologies
Descriptor(s):
*SEISMOLOGICAL STATIONS, *UNDERGROUND EXPLOSIONS, ALASKA, BACKGROUND, DETECTION, EARTHQUAKES, NETWORKS, NOISE, NUCLEAR EXPLOSIONS, POWER SPECTRA, SEISMIC WAVES, SEISMOMETERS, SIGNAL TO NOISE RATIO, SPECTRUM SIGNATURES
Field(s)/Group(s):
Seismology, Seismic Detection and Detectors
Keyword(s):
LONG PERIOD SEISMOMETERS, MURPHY DOME(ALASKA), SEISMIC NOISE, TRIAXIAL SEISMOMETERS, VELA UNIFORM
Report Date:
1970 Jan 06