W9506A/Wilcock/OBS DEPLOYMENT

General Information

  • Filing Date: 01/25/95
  • Cruise Number: W9506A
  • Title: OBS DEPLOYMENT
  • Contract/Grant Number: OCE94-03668
  • Principal Investigator(s): Will Wilcock

    Purpose

    This is the first leg of a two leg experiment to study natural seismicity on the Endeavour segment of the Juan de Fuca mid-ocean ridge (48 deg N, 129 deg W). The objective of this leg is to deploy 15 seismographs on the ocean floor which will be recover ed two months later during the second leg. 54 small 10 lb. explosive charges will be detonated just below the sea surface so that the positions of the seismographs can be accurately determined after completion of the experiment.

    Itinerary

    June 4-5
    Transit directly from Newport, OR to 48 deg N, 129 deg W
    June 5-11
    Experimental operations in the area extending from 47 deg 50' N to 48 deg 5' N and 129 deg W to 129 deg 25' W. These operations will comprise
  • 48 hour test deployment and recovery of 2 Office of Naval research ocean-bottom seismometers (OBSs)
  • Wire line tests of OBS pressure cases acoustic releases
  • Deployment of 15 OBS's
  • Discharge 54 x 10 lb. explosive charges. Each charge will comprise two 5 lb. PENTOLYTE boosters, one #6 Engineer Special fuse cap detonator, 2 ft of PETN detonator cord

    • Radioactive Use

    No

    Sampling Plan

    No samples will be collected

    Equipment Required

    Scientific Personnel To Be On Board

    • Scientist in Charge: Dr. William S. D. Wilcock UW
    • Co-Chief Scientist(s): Dr. G. Michael Purdy WHOI
    • Party Chief:
    • Technicians: Mr. John T. Hallinan WHOI
      Mr. F. Beecher Wooding WHOI
      Mr. John W. Bailey WHOI
      Mr. David L. DuBois WHOI
    • Grad. Students: Mr. Stephen D. Archer UW
      Mr. Sidi Mohammed Abdellah Cherkaoui-Manaoui UW
      Mr. Yanwu Zhang UW
    • Students:
    • Observers:

    OSU Marine Technicians assigned to Cruise

    • MT:
    • ET:

    User Supplied Equipment

    Other Bulky Heavy Items

    1. 15 ONR OBSs @ about 800 lbs. each with a 3' x 6' footprint*
    2. The OBSs will not be assembled until shortly before deployment. The frames will be on deck. The releases, recording and acquisition pressure cases, and recovery aids will be in racks and boxes in the main hydro labs. Beecher Wooding at WHOI will forwa rd a preferred layout to Ship Operations at OSU upon receipt of a deck plan.
    3. 18 OBS anchors @400 lbs. each on two pallets*
    4. 1 explosives magazine @ 1,000 lbs, footprint 6' x 6' footprint to contain
      1. 540 lbs. PENTOLYTE boosters in 5 lb. charges.*
      2. 150 ft. of PETN detonator cord.*
      3. 75, #6 Engineer Special fuse cap detonators.*
    5. 3 deck boxes of hardware, handling gear, etc. @ 150 lbs. each
    (*These items will be deployed at sea during the cruise)

    Billing Information

    Cellular/Inmarsat Phone Access

    Yes
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