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These are essentially underwater avalanches that can propagate for hundreds of kilometers, and their strength and frequency correlate strongly with the period of highest outflow from the Congo River. Their speeds vary from about 0.7 m/s to 3.5 m/s and events can last for more than a week. [ 4 ]
On nautical charts, the top of the chart is always true north, rather than magnetic north, towards which a compass points. Most charts include a compass rose depicting the variation between magnetic and true north. However, the use of the Mercator projection has drawbacks. This projection shows the lines of longitude as parallel.
The Northeast Canyons and Seamounts Marine National Monument is located within the New England and mid-Atlantic regions, 130 miles southeast of Cape Cod. [1] It comprises a total area of 4,913 square miles, [1] and protects four underwater seamounts (Bear, Mytilus, Physalia, and Retriever Seamounts) and three submarine canyons in the edge of the continental shelf (Oceanographer, Lydonia, and ...
OpenSeaMap is a software project collecting freely usable nautical information and geospatial data to create a worldwide nautical chart. This chart is available on the OpenSeaMap website, and can also be downloaded for use as an electronic chart for offline applications. [1] The project is part of OpenStreetMap. OpenSeaMap is part of the ...
A short baseline (SBL) acoustic positioning system [1] is one of three broad classes of underwater acoustic positioning systems that are used to track underwater vehicles and divers. The other two classes are ultra short baseline systems (USBL) and long baseline systems (LBL). Like USBL systems, SBL systems do not require any seafloor mounted ...
A bathymetric chart is a type of isarithmic map that depicts the submerged bathymetry and physiographic features of ocean and sea bottoms. [1] Their primary purpose is to provide detailed depth contours of ocean topography as well as provide the size, shape and distribution of underwater features.
An abyssal plain is an underwater plain on the deep ocean floor, usually found at depths between 3,000 meters (9,800 ft) and 6,000 meters (20,000 ft).Lying generally between the foot of a continental rise and a mid-ocean ridge, abyssal plains are among the flattest, smoothest and least explored regions on Earth. [1]
An octocoral (class Octocorallia) in the Hudson Canyon. The Hudson Canyon is a submarine canyon that begins from the shallow outlet of the estuary at the mouth of the Hudson River. It extends out over 640 km (400 mi) seaward across the continental shelf finally connecting to the deep ocean basin at a depth of 3–4 km (1.9–2.5 mi) below sea ...