Summary for Field Activity Number 1984-006-FA

Alternate Leg ID: 84-1

Area of Operations: Enewetak Atoll, Enewetok, Marshall Islands, Trust Territory of the Pacific Islands (TTPI), North Pacific

Dates: June 10, 1984 to July 08, 1984

Objectives: Geologic investigations of two nuclear craters.

Type of Activity: Sea floor mapping

Information to be derived:

Summary: 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.

USGS Project Number: PEACE

Contact: Jim Robb (jrobb@usgs.gov)

InfoBank: uses the identifier E-2-84-CP. Visit this site for more information.