Accession Number:

ADA142873

Title:

Marine Seismic System (MSS) Deployment. Phase 5. An Investigation of Techniques and Deployment Scenarios for Installation of Triaxial Seismometer in a Borehole in the Deep Ocean

Descriptive Note:

Final rept. 12 Dec 1982-30 Mar 1984

Corporate Author:

GLOBAL MARINE DEVELOPMENT INC IRVINE CA

Personal Author(s):

Report Date:

1984-03-31

Pagination or Media Count:

143.0

Abstract:

During the period 1979-1983, the Defense Advanced Research Projects Agency DARPA sponsored the Marine Seismic System MSS program that successfully accomplished two deepwater seismometer installations MSS81 Mid- Atlantic and MSS83 South Pacific Sites within specially emplaced seabed reentry boreholes. These deployments were accomplished by utilizing the Deep Sea Drilling Projects DSDP drillship, Glomar Challenger. Each of the three MSS operations contributed data, equipment refinement, and operational insight into the overall deep ocean deployment technology. Based upon this experience, large seismometers or other delicate instruments can be confidently deployed, utilizing the drillstring reentry technique, into seabed sediment or basalt formations in water depths to 6,096 m 20,000 ft. This report describes the design features, background analyses, and operational approach associated with the MSS Deployment System. All three MSS operations are reviewed but with particular emphasis on the latest MSS83 South Pacific deployment and recovery activities. Important development problems andor design uncertainties are also discussed. A list of references is provided as well as a detailed listing of all applicable reports and drawings.

Subject Categories:

  • Physical and Dynamic Oceanography
  • Seismology
  • Seismic Detection and Detectors

Distribution Statement:

APPROVED FOR PUBLIC RELEASE