Beghein and her research team advanced our understanding of how
oceanic plates form and evolve as they age by using and comparing two sets of seismic data; the study revealed the presence of a compositional boundary inside the plate that appears to be linked to the formation of the plate itself.
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).
Three basic forces are believed to drive
oceanic plate movement:
plates are «pushed» away from mid-ocean ridges as new sea floor
forms;
plates are «pulled» as the oldest parts of the
plate dive back into the earth at subduction zones; and convection within the asthenosphere helps ferry the
plates along.
So yes, Rapa Nui sits way out in the ass end of nowhere, atop a seamount that has
formed via the Easter hotspot, an upwelling of magma below the
oceanic crust that has generated a range of undersea mountains (the Nazca Ridge) as the Nazca
Plate drifted above it....
In this case, the quake was caused when a 620 - mile - long (1,000 kilometers) stretch of the Nazca
plate, an
oceanic plate that
forms a large swath of the Pacific Ocean floor, lurched deeper beneath the South American
plate, producing the only 9.5 - magnitude quake on record.
Beginning about 50 million years ago (and continuing to the present day), the drift of the continental
plates has caused the continents of India and Eurasia to collide, pushing up
oceanic crust from the bottom of the sea to
form the Himalayan mountain chain and the Tibetian plateau.
The CO2 pools
form when one
oceanic plate buckles under another and carbonates in the sediment break down under the intense heat.