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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1991-041-FA

Other ID: none

Status: Completed

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

Funding Program(s):

Principal Investigator(s): Juan Luis Trias

Affiliate Investigator(s): Elazar Uchupi - WHOI

Information Specialist(s):

Data Type(s): Location-Elevation: Navigation, Sampling: Geology, Seismics: Boomer, Seismics: Sub Bottom Profiler

Scientific Purpose/Goals: Marine geologic maps of Puerto Rico Insular Shelf, Salinas to Jobos area and Caja de Muertos area by Trias and Uchupi, scale 1:40,000.


Start Port/Location: Ponce Harbor, Puerto Rico

End Port/Location: Aquirre Harbor, Puerto Rico

Start Date: 1991-11-06

End Date: 1991-11-21

Equipment Used: 3.5 kHz, Grab sampler - Shipek, Boomer, Single channel hydrophone, Motorola Mini-Ranger III

Information to be Derived:

Summary of Activity and Data Gathered: Approximately 200 nautical miles of shallow seismic reflection data were collected in the nearshore waters of Caja de Muertos and Salinas-Jobos to study sub-bottom profiles. More than 200 surface samples have been analyzed for textural and chemical qualities and to delineate the boundaries of the sediment facies. The results of this investigation will be published in the Marine Geologic Map of Caja de Muertos and the Marine Geologic Map of Salinas to Jobos area. The marine geologic maps will provide reconnaissance level information on bathymetry, geologic structure, surficial sediment characteristics and coastal processes. These maps will be part of a geologic mapping program covering the Puerto Rico insular shelf that is being carried out by the U.S. Geological Survey in cooperation with the Puerto Rico Department of Natural Resources.

Staff: Kenneth E. Parolski

Affiliate Staff:
Juan Luis Trias - SJFC
Milton Carlo - SJFC; Elazar Uchupi - WHOI



south coast of Puerto Rico, Caja de Muertos, Salinas, Jobos, Puerto Rico, United States, Caribbean Sea, North America, North Atlantic;

North: 18 South: 17.8 West: -66.7 East: -66.1


photo of Jean A
Jean A


Trias, J.L., and Scanlon, Kathryn M., 1992, High-resolution seismic-reflection and echo-sounder data from Cruise JENA 91-11 on the south shelf of Puerto Rico - Isla Caja de Muertos and Salinas to Jobos areas: U.S. Geological Survey Open-File Report 92-513, 3 p., URL:


Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Grab sampler - Shipek --- Geology
Boomer --- Boomer
Motorola Mini-Ranger III --- Navigation
1991-041-FA-LN-002-01 ( Navigation data recovered from floppy disk)
1991-041-FA-LN-001 ( Navigation trackline plot for field activity 91041)
3.5 kHz --- Sub Bottom Profiler
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler
1991-041-FA-SE-001 ( Collection of paper record displays of seismic data( 3.5K) for lines )
1991-041-FA-SE-002 ( VHS digital tapes for line(s) 1, 2, 3, )
1991-041-FA-SE-003 ( microfilm of )

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