Accession Number : ADA162539


Title :   Comprehensive Final Report for the Marine Seismic System Program


Descriptive Note : Final rept.


Corporate Author : NAVAL OCEAN RESEARCH AND DEVELOPMENT ACTIVITY STENNIS SPACE CENTER MS


Personal Author(s) : Ward, J D ; Ballard, J A


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a162539.pdf


Report Date : Aug 1985


Pagination or Media Count : 233


Abstract : The Marine Seismic System program demonstrated that the technology exists to place large instrument packages, carried external to the drill string, in deep-ocean boreholes using a single deployment vessel. Operating depths of 20,000 ft are feasible, with borehole depths to 2000 ft below the ocean floor. Large, heavy, long-term data recording packages may be deployed on the sea floor and recovered by vessels with adequate winch and navigation systems. Seismic data collected by the Marine Seismic System are generally superior to ocean- bottom seismometer data. Signal/noise ratios of borehole instruments exceed those of ocean bottom seismometers by more than 15 dB in the 1-15 Hz frequency band. Subsequent to the 1983 expedition, the Marine Seismic System program was terminated. The borehole instrument package and a dummy bottom processing package remain at the 1983 experiment site. No existing programs are presently designed for continued development of a permanent marine seismic station. Keywords: Borehole seismometers; Charts; Glomar Challenger dullship; Ambient seismic noise; and Deep ocean State of the art Seismic Stations.


Descriptors :   *OCEAN BOTTOM , *SEISMOMETERS , AMBIENT NOISE , BOREHOLES , DEEP OCEANS , DEPLOYMENT , DEPTH , DRILLS , MARINE GEOPHYSICS , NAVIGATION , SEISMIC DATA , SEISMIC WAVES , SEISMOLOGICAL STATIONS , SEISMOLOGY , SHIPS , SIGNAL TO NOISE RATIO , SIGNALS , STATIONS , WINCHES


Subject Categories : Physical and Dynamic Oceanography
      Seismology


Distribution Statement : APPROVED FOR PUBLIC RELEASE