Environment

The R/V Pelican Units Sail, and Knowledge Assortment Begins


The R/V Pelican Units Sail, and Knowledge Assortment Begins

Researchers are mapping the seafloor and subseafloor between Haiti and Jamaica, to judge the potential for earthquakes.

by
Cecilia McHugh
|January 16, 2022

ship in water

The R/V Pelican. Picture: Cecilia McHugh

The R/V Pelican departed Ocho Rios on January 8, arriving at our first location alongside the Jamaica Passage on January 9.

In the course of the daytime, we run the CHIRP subbottom profiler, which lets us see an acoustic picture of the seafloor and about 10 meters into the subsurface, plus the multichannel seismic survey, which penetrates a lot deeper into the subsurface (~100 m) on this setting. We acquire sediment cores and warmth circulation measurements at evening.

Attributable to tough seas with winds of 15 knots, swells as excessive as eight toes, and minor technical points, the multichannel seismic survey and sub-bottom profiling have been gradual to begin. However the coring was very profitable and we recovered three gravity cores in water depths starting from 2500 to 2700 meters.

A gravity core is a metallic pipe with a really heavy weight (core head) that makes the core descend to the seafloor by the drive of gravity. It penetrates the sediments beneath the seafloor and recovers layers of sediment, like a layered cake, that reveal the historical past of a location, with the oldest layer on the backside and the youngest layer on high.

Collectively, these measurements and those we acquire over the approaching weeks will assist us consider the potential earthquake hazard alongside the Enriquillo-Plantain Backyard fault, positioned between Haiti and Jamaica.

As of January 13, all methods are absolutely operational and we’re accumulating nice information.

The coring system we’re utilizing is the “Huge Bertha” with a coring head weight of 3500 kilos. It may get better as much as six meters of sediment from the seafloor. Picture: Cecilia McHugh


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