Tectonics
15 questions tagged Tectonics — spanning every one of the seven Ws.
What is a fault scarp?
A fault scarp is a steep slope or cliff created by movement along a fault. It marks where the ground has been vertically displaced by tectonic forces.
When did the concept of subduction become widely recognized?
In the late 1960s and early 1970s, as deep-ocean trenches were understood as places where plates sink back into the mantle.
Which plate boundary produces the largest earthquakes?
Subduction zones at convergent plate boundaries produce the largest earthquakes, including the biggest recorded magnitude quakes.
Which earthquake has the longest known rupture length?
The 2004 Sumatra–Andaman earthquake ruptured about 1,300 kilometers of fault, one of the longest recorded earthquake ruptures.
Whose research first showed that the East African Rift is a spreading zone?
J. Tuzo Wilson and other geologists helped explain the East African Rift as a continental rift system in the mid-20th century. It is one of the best examples of a continent beginning to split apart.
Why do earthquakes happen along plate boundaries so often?
Most earthquakes cluster at plate boundaries because moving tectonic plates lock, build stress, and then suddenly slip. That sudden release of energy sends seismic waves through the ground.
What is an ophiolite?
An ophiolite is a slice of oceanic crust and upper mantle that has been pushed onto a continent and preserved on land.
What is tectonic uplift?
Tectonic uplift is the raising of Earth’s crust by forces within the planet, often during plate collisions or crustal stretching.
When was the first known supercontinent, Rodinia, proposed by scientists?
The name Rodinia was proposed in the 1990s, though the supercontinent existed about 1.1 billion to 750 million years ago.
Where is the San Andreas Fault located?
The San Andreas Fault runs through California, USA. It marks the boundary between the Pacific Plate and the North American Plate.
Where is the Dead Sea Transform fault system located?
The Dead Sea Transform lies between the Arabian Plate and the African Plate, from the Red Sea region northward through the Levant. It is a major transform fault zone.
Whose name is attached to the idea that Earth’s crust is broken into moving plates?
J. Tuzo Wilson is one of the main scientists associated with plate tectonics. He also introduced the concept of transform faults.
When was plate tectonics first accepted as the explanation for continental movement?
It became widely accepted in the late 1960s.
Where is the Kermadec Trench located?
The Kermadec Trench lies in the South Pacific Ocean northeast of New Zealand. It runs alongside the Kermadec Islands and the Tonga-Kermadec subduction zone.
Where is the Java Trench located?
The Java Trench is in the eastern Indian Ocean south of Java, Indonesia. It is also called the Sunda Trench in its northern part.