Where is a oceanic to oceanic convergent boundary?
We continue our trip up western North America to find a convergent plate boundary where oceanic crust subducts beneath oceanic crust. North of the contiguous U.S. lies Canada, and north of Canada lies Alaska. A line of volcanoes, known as the Aleutian Islands, is the result of ocean-ocean convergence.
Why do mountain ranges form at an oceanic continental convergent plate boundary?
Ocean-Continent Convergence The entire region is known as a subduction zone. The subducting plate causes melting in the mantle above the plate. The magma rises and erupts, creating volcanoes. These coastal volcanic mountains are found in a line above the subducting plate (Figure below).
What usually results at transform boundaries?
The grinding action between the plates at a transform plate boundary results in shallow earthquakes, large lateral displacement of rock, and a broad zone of crustal deformation. Perhaps nowhere on Earth is such a landscape more dramatically displayed than along the San Andreas Fault in western California.
Are there volcanoes at transform boundaries?
Recall that there are three types of plate boundaries: convergent, divergent, and transform. Volcanism occurs at convergent boundaries (subduction zones) and at divergent boundaries (mid-ocean ridges, continental rifts), but not commonly at transform boundaries.
What is a real world example of transform boundary?
The most famous example of this is the San Andreas Fault Zone of western North America. The San Andreas connects a divergent boundary in the Gulf of California with the Cascadia subduction zone. Another example of a transform boundary on land is the Alpine Fault of New Zealand.
Why are there no volcanoes in San Andreas Fault?
Volcanoes don’t form along the San Andreas Fault, a transform fault, because subduction isn’t occurring there. This means that the magma needed for volcano formation isn’t produced at this plate boundary.
When was the last time the San Andreas Fault moved?
| San Andreas Fault | |
|---|---|
| Status | Active |
| Earthquakes | 1857, 1906 (Mw ≈7.8), 1957 (Mw 5.7), 1989 (Mw ≈6.9), 2004 |
| Type | Transform fault |
| Movement | Dextral |