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Hero Fracture Zone
The Hero Fracture Zone () is an undersea fracture zone in the Antarctic. Its name was approved by the Advisory Committee on Undersea Features in June 1987. See also *Hero (sloop) The ''Hero'' was a tiny sloop, just 44 tons and 47 feet long, captained by 21-year-old Nathaniel Palmer of Stonington, Connecticut, and manned by a crew of four additional men ranging in age from 16 to 31. It was in the ''Hero'' that Palmer, in se ... References Geology of the Southern Ocean Fracture zones {{regional-geology-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fracture Zone
A fracture zone is a linear feature on the ocean floor—often hundreds, even thousands of kilometers long—resulting from the action of offset mid-ocean ridge axis segments. They are a consequence of plate tectonics. Lithospheric plates on either side of an active transform fault move in opposite directions; here, strike-slip activity occurs. Fracture zones extend past the transform faults, away from the ridge axis; seismically inactive (because both plate segments are moving in the same direction), they display evidence of past transform fault activity, primarily in the different ages of the crust on opposite sides of the zone. In actual usage, many transform faults aligned with fracture zones are often loosely referred to as "fracture zones" although technically, they are not. Structure and formation Mid-ocean ridges are divergent plate boundaries. As the plates on either side of an offset mid-ocean ridge move, a transform fault forms at the offset between the two ridge ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Advisory Committee On Undersea Features
The United States Board on Geographic Names (BGN) is a federal body operating under the United States Secretary of the Interior. The purpose of the board is to establish and maintain uniform usage of geographic names throughout the federal government of the United States. History On January 8, 1890, Thomas Corwin Mendenhall, superintendent of the US Coast and Geodetic Survey Office, wrote to 10 noted geographers "to suggest the organization of a Board made up of representatives from the different Government services interested, to which may be referred any disputed question of geographical orthography." President Benjamin Harrison signed executive order 28 on September 4, 1890, establishing the ''Board on Geographical Names''. "To this Board shall be referred all unsettled questions concerning geographic names. The decisions of the Board are to be accepted y federal departmentsas the standard authority for such matters." The board was given authority to resolve all unsettled ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hero (sloop)
The ''Hero'' was a tiny sloop, just 44 tons and 47 feet long, captained by 21-year-old Nathaniel Palmer of Stonington, Connecticut, and manned by a crew of four additional men ranging in age from 16 to 31. It was in the ''Hero'' that Palmer, in search of as-yet-unknown seal-hunting prospects, stumbled upon Deception Island (in November 1820) and, soon afterward, first sighted the snow-clad mountains of the Antarctic coastline to the south-southeast. Palmer would soon afterward relay his signal discovery to a Russian exploration fleet, which had been sent to the distant southern waters by Alexander I of Russia. In honor of Palmer's ''Hero'', US National Science Foundation named a research ship for her, ''RV Hero''. The new ''Hero'' was a diesel-driven, 125-foot ship, equipped with sails also, which was built for doing research in the waters of the Antarctic Peninsula, from her port at Palmer Station. She was launched from Harvey F. Gamage shipyard in South Bristol, Maine Sout ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Geology Of The Southern Ocean
Geology () is a branch of natural science concerned with Earth and other astronomical objects, the features or rocks of which it is composed, and the processes by which they change over time. Modern geology significantly overlaps all other Earth sciences, including hydrology, and so is treated as one major aspect of integrated Earth system science and planetary science. Geology describes the structure of the Earth on and beneath its surface, and the processes that have shaped that structure. It also provides tools to determine the relative and absolute ages of rocks found in a given location, and also to describe the histories of those rocks. By combining these tools, geologists are able to chronicle the geological history of the Earth as a whole, and also to demonstrate the age of the Earth. Geology provides the primary evidence for plate tectonics, the evolutionary history of life, and the Earth's past climates. Geologists broadly study the properties and processes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
