Other ID: 84-1
Organization(s): USGS, Woods Hole Coastal and Marine Science Center
Location: Enewetak Atoll, Enewetok, Marshall Islands, Trust Territory of the Pacific Islands (TTPI), North Pacific;
Principal Investigator(s): David W. Folger
Affiliate Investigator(s): R.C. Hollar - Party Chief, Meridian Ocean Systems
Data Type(s): Imagery: Photo, Location-Elevation: Navigation, Seismics: Boomer, Sonar: Sidescan, Sonar: Single Beam
Scientific Purpose/Goals: Geologic investigations of two nuclear craters.
Start Date: 1984-06-10
Start Port/Location: Kwajelein, Trust Territory of the Pacific Islands
End Date: 1984-07-08
End Port/Location: Kwajelein, Trust Territory of the Pacific Islands
Equipment Used: Raytheon DE-719 precision echo sounder, Huntec profiling system (500-2500 Hz), Klein 531 sidescan, 35 mm camera, Motorola Falcon IV Microwave relay Mini-Ranger
Information to be Derived:
Summary of Activity and Data Gathered: In Enewetak Lagoon 12 June - 5 July; on survey 19 June - 4 July following navigation set up and area reconnaissance. This operation was the first of several phases of investigation of two nuclear test craters, OAK and KOA, in the northern part of Enewetak Atoll. Data were acquired in parallel-line grids having nominal line spacings of 26 km (85 ft) for bathymetry, and 76 m (250 ft) for sidescan sonar and sub-bottom (Huntec boomer) profiles. Tie-line data were also acquired. Additional bathymetric data were acquired by small boat. The ship was operated only during daylight hours because hazards from shallow water and proximity to the reef required maximum visibility. A mosaic of the sidescan sonar images was constructed from the field data during the operation. A tide gauge was deployed in each of the craters for bathymetric corrections, although only the KOA gauge appears to have operated successfully. Bathymetry data: 350 km; Sidescan sonar data: 210 km; Sub-bottom profiler (Huntec) data: 115 km.
Staff: Dann Blackwood, David W. Folger, Gregory Miller, Kenneth E. Parolski, James M. Robb
Notes: Original Center People field contained: Dave Folger (Ch. Sci./geologist); James Robb (curator/geologist); Greg Miller (technician); Kenneth Parolski (technician); Dann Blackwood (photographer).
Folger, D.W., 1986, Introduction, in Folger, D. W., ed., Sea-floor observations and subbottom seismic characteristics of OAK and KOA craters, Enewetak Atoll, Marshall Islands: U.S. Geological Survey Bulletin 1678, URL: http://pubs.er.usgs.gov/usgspubs/b/b1678.
Folger, D.W., Hampson, J. C., Robb, J. M., Woellner, R. A., Foster, D. S., and Tavares, L. A., 1986, Bathymetry of OAK and KOA craters, Chapter A in Folger, D. W., ed., Sea-floor observations and subbottom seismic characteristics of OAK and KOA craters, Enewetak Atoll, Marshall Islands: U.S. Geological Survey Bulletin 1678, URL: http://pubs.er.usgs.gov/usgspubs/b/b1678.