Sentences with phrase «subducting oceanic»

The most threatening earthquakes in Cascadia are those associated with the Cascadia subduction zone, which is the tectonic plate boundary between the subducting oceanic Juan de Fuca, Gorda, and Explorer Plates and the over-riding continental North America Plate.

At certain subduction zones, such as those in Cascadia, Sumatra and eastern Alaska, a thick sediment layer overlies the subducting oceanic plate.

However, the mantle remained so hot that it softened the subducting oceanic crust too much for it to pull large areas of continental crust down behind it, as it does today.

Water migrates upwards and causes the top of the subducted oceanic crust to melt, producing magma beneath the Cascade volcanoes.

Song and team believe that it may be subducted oceanic crust at unusually high levels of water saturation.

Not exact matches

The Andes were formed by tectonic activity whereby earth is uplifted as one plate (oceanic crust) subducts under another plate (continental crust).

The complex regional tectonic activity includes movement of three plates: the Caribbean plate that is subducting or being forced beneath Colombia in the north; the Panama block or Panama plate that is colliding with Colombia in the central part of the country; and the Nazca plate, which is an oceanic plate that is subducting beneath the southern part of Colombia from the Pacific.

It marks the plate boundary between the subducting Nazca plate and the South America plate, where the oceanic crust and lithosphere of the Nazca plate begin their descent into the mantle beneath South America.

Jones and his colleagues propose the water came from the subducting Farallon oceanic plate under the Pacific Ocean 75 to 45 million years ago.

The team found that the subducting slab — a portion of the oceanic plate that slides beneath a continental plate — is the dominant driving force behind the deformation of the mantle.

At subduction zones such as these, an oceanic tectonic plate sinks (subducts) into the Earth's interior, the mantle.

The northwest Pacific crust that is subducting in this area is some of the oldest, coldest oceanic crust subducting on Earth.

As a result, mantle plumes entrain a variable combination of relatively young oceanic crust directly from the subducting slab, older oceanic crust that has been stirred with ancient more primitive material and background, depleted mantle.

«Some material might be associated with former basaltic oceanic crust that got subducted deeply.

The research, published in the journal Nature Geoscience, found that the Earth's largest flat slab, located beneath Peru, where the oceanic Nazca Plate is being subducted under the continental South American Plate, may be relatively weak and deforms easily.

As long as rapid continental weathering continued, carbonate was deposited on the oceanic crust and subducted into what Lowe calls «a big storage facility... that kept most of the carbon dioxide out of the atmosphere.»

Slowly, the carbonate rocks will be eroded and carried by rivers to the oceans, deposited to the ocean floor and, eventually, subducted along the oceanic / continental plate boundaries.

Deep earthquakes, also called intraplate quakes, take place within the oceanic Juan de Fuca plate (beneath Oregon and Washington) and the Gorda plate (beneath northwestern California) as they subduct beneath the North America plate.

a) The oceanic plate is subducting beneath the continental plate.