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USGS Coastal and Marine Geology Program

Field Activity Details for field activity 1982-003-FA

Other ID: 82-2

Status: Completed

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

Funding Program(s):

Principal Investigator(s): Juan Luis Trias

Affiliate Investigator(s): Ramon Alonso - PR DNR, Chief Scientist

Information Specialist(s):

Data Type(s): Location-Elevation: Navigation, Seismics: Boomer, Seismics: Sparker, Sonar: Single Beam

Scientific Purpose/Goals: 1. PR DNR contract from Puerto Rico Electric Power to survey possible channel areas of Bahia de Jobos for possible dredging in the near future of deep channel for coal freighters. 2. Make seismic and bathymetry profiles with highest possible resolution.


Start Port/Location:

End Port/Location:

Start Date: 1982-02-01

End Date: 1982-02-18

Equipment Used: Boomer, Sparker , Single channel hydrophone, Motorola Mini-Ranger III, Raytheon DE-719 precision echo sounder

Information to be Derived:

Summary of Activity and Data Gathered: R/V JEAN A served as base and hotel depot. R/V RACHEL CARSON was used for surveying with an additional 14-ft. outboard for shallow water surveying. The first four days were used to set gear and transponder stations in a very rough country area. The surveying time for each day was short due to bad weather in the area (rough seas and strong winds). Estimated total length of seismic lines: 20 nm.

Staff: David Nichols, George B. Tirey, Juan Luis Trias, James V. A. Trumbull

Affiliate Staff:
Ramon Alonso - PR DNR
Chief Scientist; Nelson Espinel - PR DNR
field technician; Capt. Cristobal Borras - PR DNR
Captain of RACHEL CARSON; Julio Ortiz - PR DNR
utility man

Notes: Original Center People field contained: Juan Luis Trias, Geologist; James Trumbull, Scientist; Rusty Tirey, Woods Hole, MA, scientist; Dave Nichols, Woods Hole, MA, electronic technician.


Jobos Bay, Bahia de Jobos, South Coast of Puerto Rico, Puerto Rico, United States, Caribbean Sea, North America, North Atlantic;

North: 18 South: 17.6 West: -66.5 East: -66.1


photo of Jean A
Jean A

Rachel Carson



Data Acquired

Survey EquipmentSurvey InfoData Type(s)Data Collected
Raytheon DE-719 precision echo sounder --- Single Beam
Boomer --- Boomer
Sparker --- Sparker
Motorola Mini-Ranger III --- Navigation
Single channel hydrophone --- Air Gun / Water Gun
Bubble Gun
Sub Bottom Profiler

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