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CUSS I : ウィキペディア英語版
Project Mohole

Project Mohole was an ambitious attempt to drill through the Earth's crust into the Mohorovičić discontinuity, and to provide an Earth science complement to the high-profile Space Race. The project was initially led by the American Miscellaneous Society with funding from the National Science Foundation.
Phase One was executed in spring 1961. Five holes were drilled off the coast of Guadalupe Island, Mexico, the deepest to below the sea floor in of water. This was unprecedented: not in the hole's depth but because of the depth of the ocean and because it was drilled from an untethered platform. Also, the core sample proved to be valuable; penetrating through Miocene-age sediments for the first time to reveal the lowest 13 m (44 ft) consisting of basalt.
Project Mohole contracted with Global Marine of Los Angeles for the use of its oil drillship ''CUSS I''. A consortium of Continental, Union, Superior and Shell Oil Companies, CUSS had originally developed it in 1956 as a technological test bed for the nascent offshore oil industry. ''CUSS I'' was one of the first vessels in the world capable of drilling in water depth up to , while maintaining a position within a radius of . Project Mohole expanded its operational range by inventing what is now known as dynamic positioning.
Phase One proved that both the technology and expertise were available to drill into the Earth's mantle. It was intended as the experimental phase of the project, and did succeed in drilling to a depth of 601 feet below the sea floor.〔(【引用サイトリンク】title=Project Mohole )〕 However, deeper drilling never took place. An attempted shift of operational control to the National Science Foundation proved unsatisfactory, and in short order the American Miscellaneous Society dissolved itself, phase two of the project was abandoned and the entire project was discontinued by Congress, which objected to increasing costs in 1966.〔〔
==See also==

*Walter Munk
*Ocean Drilling Program
*Deep Sea Drilling Program
*Integrated Ocean Drilling Program
*Kola Superdeep Borehole

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Project Mohole」の詳細全文を読む



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