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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1981-015-FA

Other ID: 81-LH-1; LONGHORN-81-USGS1

Status: Completed

Organization(s): USGS, Woods Hole Coastal and Marine Science Center

Funding Program(s):

Principal Investigator(s): Peter Johnson

Affiliate Investigator(s): Chuck Holmes - USGS-Corpus Christi, TX

Information Specialist(s):

Data Type(s): Sonar: Sidescan, Seismics: Sub Bottom Profiler, Location-Elevation: Navigation

Scientific Purpose/Goals: Obtain seismic reflection data in the Florida Straits and the Florida Shelf; photograph the Miocene(?) ledge to confirm the existence of mineral deposits.


Start Port/Location: Key West, FL

End Port/Location: Miami, FL

Start Date: 1981-05-27

End Date: 1981-06-09

Equipment Used: Klein 531 sidescan, ORE 140 transceiver/1036 transducer sub-bottom profiler, Loran-C, Del Norte, transponder net

Information to be Derived: Grain size analysis; Sea floor map; Morphology;

Summary of Activity and Data Gathered: Sidescan: 550 km; Minisparker: 1603 km; 3.5 kHz: 608 km; Core (rotary drill): 1; Diver samples: 3; Camera stations: 3.

Staff: Charles W. Holmes, Ronald J. Miller, Peter Johnson, James C. McFarlen

Affiliate Staff:
Paul Schoeder

Notes: Original Center People field contained: USGS-Corpus Christi: Chuck Holmes - Ch. Sci., Ronald Miller, Jack Kindinger, Paul Schoeder, James McFarlen; USGS-Woods Hole: Peter Johnson.
Project = West Florida Shelf, West Florida Shelf


Florida Straits, West Florida shelf, Florida, Gulf of Mexico, United States, North America, North Atlantic;

North: 26 South: 24 West: -84.5 East: -81


photo of Longhorn



Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Klein 531 sidescan --- Sidescan
1981-015-FA-SO-001 ( analog tape of seismic data)
ORE 140 transceiver/1036 transducer sub-bottom profiler --- Sub Bottom Profiler
1981-015-FA-SE-001 ( analog tape of seismic data)
Del Norte, transponder net --- Navigation
Loran-C --- Navigation
1981-015-FA-LN-001 ( LONGHORN 81-1 Track Map (pdf file) West Florida Shelf composite track map including GYRE 81-8 (FA 81012), May 15-20, 1981; LONGHORN 81-1 (FA 81015), May 27-June 9, 1981; SEA ANGEL (no FA #), Aug 10?-29?, 1981; and BELLOWS (FA 82014), May 24-June 6, 1982.)
1981-015-FA-LN-002 ( Digital tapes of NV and NV-NSTAR data: inv. # 1061, 1110, 1129, 2292, and 2542 thru 2547.)

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