Laurentia was crashing into oceanic plate Iapetus.
New Madrid, however, has evaded explanation because it is right in the middle of the North American continental plate
, far from the edges where earthquakes usually occur.
FOR hundreds of thousands of years before and after the asteroid, the movement of India against the Asian continental plate
would have produced massive, prolonged volcanic activity.
Using GPS measurements from other locations and conventional surveying methods, researchers have estimated that Everest Is rising an average of 1 to 2 inches per year, pushed up by the collision of India's continental plate
Accretion occurs where oceanic sediments are scraped off a subducting plate and added to a large wedge on the edge of the overriding continental plate
The scientists analyzed the composition of rocks from two regions in the Himalayas, and discovered evidence of two separate collisional events: As India crept steadily northward, it first collided with a string of islands 50 million years ago, before plowing into the Eurasian continental plate
10 million years later.
The quakes originated from the Cascadia Subduction Zone, the meeting point of two large tectonic plates known as the San Juan de Fuca plate and the continental plate
The Pacific plate is moving to the north-northwest and the continental plate
is moving to the west.
Geoscientists are seeking to understand Tibet and its flanking mountain ranges because these features represent the best available lesson on what happens when one continental plate
rams into another, an event that has recurred countless times in Earth's past (SN: 7/14/90, p.
2 event suggest that the rock ruptured at the boundary where the Pacific plate sinks below another continental plate
In international cooperation, it was possible to follow the route of the approximately 100 kilometers thick Indian continental plate
An earthquake rocks a coastal city, releasing energy built up in an underlying continental plate
While being subducted, sediments are scraped off the oceanic plate and added to the overriding continental plate
The oceanic plate sticks as it is forced to slide under the continental plate
, building up a tremendous strain along this interface, which gives way periodically with an earth-shaking release of energy.
Heaton and Hartzell suspect that this shallow descent reflects teh buoyancy of the young crust, and that because it is buoyant, the oceanic plate pushes up on the overriding continental plate
, jamming the two together.