- East Pacific Rise
The East Pacific Rise is a
mid-oceanic ridge, a divergent tectonic plate boundary located along the floor of the Pacific Ocean. It separates the Pacific Plateto the west from (north to south) the North American Plate, the Rivera Plate, the Cocos Plate, the Nazca Plate, and the Antarctic Plate. It runs from an undefined point near Antarcticain the south northward to its termination at the northern end of the Gulf of Californiain the Salton Seabasin in southern California.
oceanic crustis moving away from the East Pacific Rise to either side. On the eastern side the eastward moving plates meet the westward moving South American Plateand the North American Plateand are being subducted under them. The belt of volcanoes along the Andesand the arc of volcanoes through Central Americaand Mexicoare the direct results of this collision. Due east of the Baja California Peninsula, the newly-formed crust from the Rise appears to be in a transition which is thus far geologically undefined, but may become a subduction zone as well.
Easter Island, the East Pacific Rise meets the Chile Riseat the Easter Island and Juan Fernandez microplates, trending off to the east where it subducts under the South American Plateat the Peru-Chile Trenchalong the coast of southern Chile. The southern extension of the East Pacific Rise (called the Pacific-Antarctic Ridge) merges with the Southeast Indian Ridgeat the Macquarie Triple Junctionsouth of New Zealand.
Along the East Pacific Rise the
hydrothermal vents called black smokers were first discovered and have been extensively studied. These vents are forming volcanogenic massive sulfide ore deposits on the ocean floor. Many strange deep-water creatures have been found here. The southern stretch of the East Pacific Rise is one of the fastest-spreading sections of the Earth's mid-ocean ridgesystem.
* [http://marineemlab.ucsd.edu/Projects/EPR2004/ Scripps Institution of Oceanography East Pacific Rise Marine EM website]
* [http://www.earth.columbia.edu/news/2002/story12-05-02.html Galapagos rise and microplate]
Wikimedia Foundation. 2010.
Look at other dictionaries:
East Pacific Rise — a long north south elevation of the sea floor in the E Pacific Ocean extending southward from SW Mexico to the Antarctic Ocean. * * * Submarine linear mountain range on the floor of the South Pacific Ocean, roughly paralleling the western coast… … Universalium
East Pacific Rise — a long north south elevation of the sea floor in the E Pacific Ocean extending southward from SW Mexico to the Antarctic Ocean … Useful english dictionary
Pacific Ocean — an ocean bordered by the American continents, Asia, and Australia: largest ocean in the world; divided by the equator into the North Pacific and the South Pacific. 70,000,000 sq. mi. (181,300,000 sq. km); greatest known depth, 35,433 ft. (10,800… … Universalium
Pacific Ring of Fire — The Ring of Fire redirects here. For other uses of the term, see Ring of Fire (disambiguation). The Pacific Ring of Fire (see below) … Wikipedia
Pacific Ocean — <p></p> <p></p> Introduction ::Pacific Ocean <p></p> Background: <p></p> The Pacific Ocean is the largest of the world s five oceans (followed by the Atlantic Ocean, Indian Ocean, Southern Ocean,… … The World Factbook
Pacific Plate — The Pacific Plate is an oceanic tectonic plate beneath the Pacific Ocean.To the north the easterly side is a divergent boundary with the Explorer Plate, the Juan de Fuca Plate and the Gorda Plate forming respectively the Explorer Ridge, the Juan… … Wikipedia
pacific — /peuh sif ik/, adj. 1. tending to make or preserve peace; conciliatory: pacific overtures. 2. not warlike; peaceable; mild: a pacific disposition. 3. at peace; peaceful: a pacific era in history. 4. calm; tranquil: The Wabash is a pacific river.… … Universalium
east — eastness, n. /eest/, n. 1. a cardinal point of the compass, 90° to the right of north. Abbr: E 2. the direction in which this point lies. 3. (usually cap.) a quarter or territory situated in this direction. 4. the East, a. the parts of Asia… … Universalium
Pacific-Antarctic Ridge — The Pacific Antarctic Ridge (PAR) is a divergent tectonic plate boundary located on the seafloor of the South Pacific Ocean, separating the Pacific Plate from the Antarctic Plate. It is regarded as the southern section of the East Pacific Rise in … Wikipedia
Pacific Plate — Geol. one of the major tectonic divisions of the earth s crust, comprising four sea floor basins; separated from the Nazca, Cocos, and North and South American plates by the East Pacific Rise and San Andreas fault and bounded in the western… … Universalium