Accession Number : ADA330660

Title :   High Resolution Measurements of the Shallow Structure of the Oceanic Crust: The Rebuild of NOBEL.

Descriptive Note : Final rept. 1 Jan 94-30 Sep 96,

Corporate Author : WOODS HOLE OCEANOGRAPHIC INSTITUTION MA DEPT OF GEOLOGY AND GEOPHYSICS

Personal Author(s) : Collins, John A.

PDF Url : ADA330660

Report Date : 14 OCT 1997

Pagination or Media Count : 3

Abstract : The goal of this program was to build a deep-towed explosive source that would allow high resolution seismic experiments to be carried out on the ocean floor with a precision and resolving power that is not attainable in any other way. This source, which we call NOBEL (Near Ocean Bottom Explosives Launcher), has an operational depth of 6000 m and can carry, launch and detonate 47 5-10 lb. charges of explosive while being towed a few tens of meters above the ocean floor on a research vessel's conventional 0.68" coaxial cable. Following a completely successful cruise to the East Pacific Rise in early 1991, NOBEL was unfortunately lost in mid-1992 while carrying out a set of experiments over gas hydrate deposits off the East Coast of the U.S. The single objective of this program was to rebuild this unique seismo-acoustic source. Construction of the system is complete. NOBEL was used extensively on an NSF-funded cruise to the Mid-Atlantic Ridge in June of 1997. It was deployed on ten separate occasions and worked superbly each time.

Descriptors :   *OCEANIC CRUST, UNDERWATER EXPLOSIONS, SEISMOLOGY, DEEP DEPTH, MIDATLANTIC RIDGE.

Subject Categories : Physical and Dynamic Oceanography

Distribution Statement : APPROVED FOR PUBLIC RELEASE