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The Pacific plate is an oceanic tectonic plate that lies beneath the Pacific Ocean. At 103 million km 2 (40 million sq mi), it is the largest tectonic plate. [2] The plate first came into existence as a microplate 190 million years ago, at the triple junction between the Farallon, Phoenix, and Izanagi plates. The Pacific plate subsequently grew ...
The subducting Pacific plate lies between 170 km (110 mi) to 450 km (280 mi) beneath the Havre Trough between 28°S to 35°S. [3] South of the Rapuhia Scarp at 35°S it is thought that the Hikurangi Plateau volcanics which are up to 15 km (9.3 mi) thick are subducting and this remnant of a Cretaceous Large Igneous Province changes erupted ...
These two oceanic plates are currently moving east, subducting underneath the North American plate in what is known as the Cascadia subduction zone. [3] To the west and south of the ridge is the Pacific plate, which is currently moving west, and diverging from the Gorda plate. [3]
The Farallon plate subducted under North America from the late Mesozoic, while spreading between the Pacific and Farallon plates was initiated 190 Ma and lasted until the break-up of the Farallon plate 23 Ma. During the Cenozoic the Farallon plate broke up along the eastern Pacific margin into the Kula, Vancouver/Juan de Fuca, and Cocos plates.
Obduction zones occurs when the continental plate is pushed under the oceanic plate, but this is unusual as the relative densities of the tectonic plates favours subduction of the oceanic plate. This causes the oceanic plate to buckle and usually results in a new mid-ocean ridge forming and turning the obduction into subduction. [citation needed]
The present basin is a coastal lowland area, whose floor is marked by elongate low ridges and groups of hills that is located on the edge of the Pacific plate. [1] The Los Angeles Basin, along with the Santa Barbara Channel, the Ventura Basin, the San Fernando Valley, and the San Gabriel Basin, lies within the greater Southern California region ...
The Mendocino triple junction is located at the eastern end of the Mendocino Fracture Zone where it approaches Cape Mendocino. The Mendocino triple junction (MTJ) is the point where the Gorda plate, the North American plate, and the Pacific plate meet, in the Pacific Ocean near Cape Mendocino in northern California.
The Galápagos microplate is forming at the triple junction of the Nazca (shown in pink), Cocos, and Pacific plates. The Galápagos triple junction (GTJ) is a geological area in the eastern Pacific Ocean several hundred miles west of the Galápagos Islands where three tectonic plates – the Cocos plate, the Nazca plate, and the Pacific plate – meet.