Accession Number:

ADA063163

Title:

Proceedings of the Workshop on Seismic Propagation in Shallow Water Held on 6-7 July 1978 at Office of Naval Research, Arlington, Virginia.

Descriptive Note:

Corporate Author:

OFFICE OF NAVAL RESEARCH ARLINGTON VA

Personal Author(s):

Report Date:

1978-07-07

Pagination or Media Count:

434.0

Abstract:

This workshop considered seismic propagation in the continental margin e.g., water depths of 200m or less. When an acoustic signal is radiated into water, a certain amount of the energy is coupled with the bottom and may be measurable as a seismic signal. There are indications that a horizontally oriented geophone may provide better signal to noise ratio in shallow water than a hydrophone measuring the same signal. The workshop was not technology oriented but was designed to explore some of the physical processes involved with seismic propagation. The conventional acoustic methods for detection of submarines at long range lose their attractiveness in shallow water where acoustic energy is rapidly attenuated through interactions with the surface and bottom and its coherence is similarly lost. A substantial part of the worlds oceans can be classified as shallow water, including such important areas as the North Sea, East Coast of the Americas, etc.. One possible alternative to acoustic surveillance may be seismic surveillance.

Descriptors:

• *SEISMIC WAVES
• COUPLING(INTERACTION)
• SIGNAL TO NOISE RATIO
• SEISMIC DETECTION
• SHALLOW WATER
• CONTINENTAL SHELVES
• WAVE PROPAGATION
• LONG RANGE(DISTANCE)
• SUBMARINE DETECTION
• WORKSHOPS
• OCEAN SURVEILLANCE
• SEISMIC ARRAYS
• EXTREMELY LOW FREQUENCY
• GEOPHONES

Subject Categories:

• Seismology
• Military Intelligence
• Undersea and Antisubmarine Warfare
• Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE