Earthquakes where plates collide

Part of Hall of Planet Earth.

Earthquakes Where Plates Collide AMNH/R.Mickens

Subduction zones are places where two of the Earth’s plates collide, with one descending beneath the other. Many earthquakes occur along these zones, usually near the top of the descending plate, where it meets the overlying mantle. This narrow region is known as the Benioff zone, after the seismologist who discovered it. Subduction-zone earthquakes are among the largest observed. They also occur at the greatest depths, sometimes as deep as 700 kilometers below the Earth’s surface.

In This Section

Exhibit The Aleutian subduction zone The Aleutian Trench, extending 2,900 kilometers from the Gulf of Alaska to Kamchatka, marks the place where the Pacific plate is... Exhibit The Great Alaskan Earthquake On March 27, 1964, one of the largest earthquakes of the 20th century occurred in southern Alaska. Exhibit Why do earthquakes happen? In 1906, the seismologist Henry Reid developed the “elastic rebound theory” to explain earthquakes. Exhibit What is a fault? A fault is a rock fracture along which movement occurs.