Hydroacoustic observations of the NPE

Conference · Fri Dec 30 23:00:00 EST 1994

OSTI ID:96010

Harris, D; Hauk, T; Breitfeller, E ^[1]

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1. Lawrence Livermore National Lab., CA (United States); and others

The NPE was observed by three hydrophone arrays located off of the coast of California: (1) a special sonobuoy pattern deployed for the Lawrence Livermore National Laboratory by COMPATWINGSSPAC, U.S. Navy, (2) the SwellEx vertical line array deployed by the Marine Physical Laboratory, Scripps Institute of Oceanography, and (3) an array of the U.S. Navy SOSUS system. The P phase from the event was just visible in the sonobuoy data, very clear on the vertical line array (after beamforming), and moderately well recorded on the SOSUS array. Calibration of the SwellEx array hydrophones and electronics allows us to estimate the pressure level of the NPE P phase at 75-80 dB re 1 uPascal**2/Hz between 2 and 9 Hz. We use observations of the HUNTERS TROPHY nuclear test to demonstrate several beamforming methods that use vertical line arrays to suppress the predominantly horizontally propagating ambient acoustic noise. Such arrays could be used to supplement seismic systems for monitoring inaccessible continental regions from adjacent oceans.

• Research Organization: Lawrence Livermore National Lab., CA (United States)
• OSTI ID: 96010
• Report Number(s): CONF-9404100--; ON: DE95011413
• Country of Publication: United States
• Language: English

Related Subjects

35 ARMS CONTROL
45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
AMMONIUM NITRATES
BUOYS
CHEMICAL EXPLOSIONS
CONTINENTAL SHELF
DETONATIONS
FUEL OILS
NON-PROLIFERATION TREATY
NUCLEAR EXPLOSION DETECTION
PRESSURE DEPENDENCE
SEISMIC DETECTORS
SEISMIC WAVES
SIGNAL-TO-NOISE RATIO
UNDERGROUND EXPLOSIONS
VERIFICATION
WAVE FORMS