Measuring sea floor spreading acoustically, using dual frequency smart transponders
Description
United States Geological Survey, Menlo Park, California. Chief Scientists: Jan Morton, Carol Reiss. Data (underwatertelevision, CTDmeter, bathymetry, transitsatellite, bottomtransponder, submersible (Turtle)) of field activity C-1-94-WF in Juan de Fuca Ridge from 08/17/1994 to 08/25/1994
Location
Juan de Fuca Ridge
Summary
Carol Reiss (Co-Chief), Stephanie Ross, and Tracy Vallier returned August 26, 1994 from a successful cruise to the southern Juan de Fuca Ridge, onboard the DSVSS LANEY CHOUEST, support ship to the DSV Turtle, and ATV (Advanced Tethered Vehicle). The Turtle and ATV are U.S. Navy owned and operated vehicles of the Deep Submergence Group One. Considerable planning, great weather, and hard work enabled us to successfully reposition several instruments that were previously deployed in 1992. A total of four tripods with dual frequency transponders were initially deployed across the axis of the spreading ridge to determine the rate and tectonic/volcanic relationship of plate separation using acoustic instruments. Two DVS Turtle dives and four ATV dives accomplished the complex task of repositioning two tripods, recovering a damaged transponder, and completing a detailed geologic reconnaisance (inclunding CTD casts) between and around the tripods. SeaBeam bathymetric data was collected during the transit between the Coos Bay, OR., and the Juan de Fuca Ridge. The cruise was funded by NURP (National Underwater Research Proogram) through the West Coast National Undersea Research Center, University of Alaska, Fairbanks. Future efforts will include annual site visits to retrieve range data from the transponders, as well as additional instrument deployments to extend the experiment to include older faults and fissures along the Juan de Fuca Ridge.
Comments
Locations 1-4 are the tripod locations of the dual frequency transponders deployed on C-1-92-WF. Data Inventory folder contains: Oceano SI printout (2 stacks), daily report 9pgs., ATV Camera and operations logs; 781-94-14 Turtle dive folder (communications log, nav plot, printout, and floppy nav); 782-94-15 Turtle dive folder (communications log, nav plot, printout, and floppy nav); 94-39-83 ATV folder (2 plots, printout and floppy); 94-40-84 ATV folder (1 plot, printout and floppy); 94-41-85 ATV folder (3 plots, 2 printouts and floppy); 94-42-86 ATV folder combined with 94-41-85 folder; 3.5" PC floppies (2 NS011 travel time data 4" Compac Tapes; 3 SeaBeam bathymetric data; maps; VHS tapes (94-39-83 ATV 3 of 3, 94-40-84 ATV 3 of 3, 94-41-85 ATV 5 of 5, 94-42-86 ATV 2 of 2); Hi 8 tapes (781-94-14 Turtle 5 of 5, 782-94-15 Turtle 6 of 6, 94-39-83 ATV 3 of 3, 94-40-84 ATV 5 of 5, 94-41-85 ATV 8 of 8, 94-42-86 ATV 2 of 2, Hand held on deck recording of ship activities 1 of 1).
Staff information imported from InfoBank
Jan Morton (USGS Western Region) - Chief Scientist
Carol Reiss (USGS Western Region) - Chief Scientist
Stephanie Ross (USGS Western Region) - Unspecified Investigator
Tracy Vallier (USGS Western Region) - Unspecified Investigator
