Pacific Vortex: Chart room and more

Pg 78

"You'll find Commander Denver in the chart room."

The chart room is just what it sounds like, a room full of charts that can be placed on a lighted table so that positions can be plotted. Of course the room is also full of other equipment lining the walls.

Two of our oceanographic ships were conducting subbottom profiling and underwater acoustical tests in the Kurile Trench off Japan...

The Kuril–Kamchatka Trench or Kuril Trench (Russian: Курило-Камчатский жёлоб) is an oceanic trench in the northwest Pacific Ocean. It lies off the southeast coast of Kamchatka and parallels the Kuril Island chain to meet the Japan Trench east of Hokkaido. It extends from a triple junction with the Ulakhan Fault and the Aleutian Trench near the Commander Islands, Russia, in the northeast, to the intersection with the Japan Trench in the southwest.

The trench formed as a result of the subduction zone, which formed in the late Cretaceous, that created the Kuril island arc as well as the Kamchatka volcanic arc. The Pacific Plate is being subducted beneath the Okhotsk Plate along the trench, resulting in intense volcanism.

"Another ship working over the Cayment Trench off Cuba came up with the identical contact."

This must be a typo. It is actually the Cayman Trench.
The Cayman Trough, (also known as the Cayman Trench, Bartlett Deep and Bartlett Trough) is a complex transform fault zone pull apart basin which contains a small spreading ridge on the floor of the western Caribbean Sea between Jamaica and the Cayman Islands. It is the deepest point in the Caribbean Sea and forms part of the tectonic boundary between the North American Plate and the Caribbean Plate. It extends from the Windward Passage, going south of the Sierra Maestra of Cuba toward Guatemala. The transform continues onshore as the Motagua Fault, which cuts across Guatemala and extends offshore under the Pacific Ocean, where it intersects the Middle America Trench subduction zone.

The relatively narrow trough trends east-northeast to west-southwest and has a maximum depth of 7,686 metres (25,217 ft). Within the trough is a slowly spreading north-south ridge which may be the result of an offset or gap of approximately 420 kilometres (260 mi) along the main fault trace. The Cayman spreading ridge shows a long-term opening rate of 11–12 mm/yr.

The eastern section of the trough has been named the Gonâve Microplate. The Gonâve plate extends from the spreading ridge east to the island of Hispanola. It is bounded on the north by the Oriente and Septentrional fault zones. On the south the Gonâve is bounded by the Walton fault, the Jamaica restraining bend and the Enriquillo-Plantain Garden fault zone. The two bounding strike slip fault zones are left lateral. The motion relative to the North American Plate is 11 mm/yr to the east and the motion relative to the Caribbean Plate is 8 mm/yr.

During the Eocene the trough was the site of a subduction zone which formed the volcanic arc of the Cayman Ridge and the Sierra Maestra volcanic terrain of Cuba to the north, as the northeastward-moving Caribbean Plate was subducted beneath the southwest-moving North American Plate, or as some researchers contend, beneath a plate fragment dubbed the East Cuban Microplate.

In 2010 a UK team from the National Oceanography Centre in Southampton (NOCS), equipped with an autonomously controlled, robot submarine, began mapping the full extent of the trench and discovered black smokers on the ocean floor at a depth of 3.1 miles (5 kilometers), the deepest yet found. In January 2012, the researchers announced that water exits the vents at a temperature possibly exceeding 450C, making them among the hottest known undersea vents. They also announced the discovery of new species, including an eyeless shrimp with a light-sensing organ on its back.