The Carnegie Ridge

The Carnegie Ridge is sliding under Ecuadorian land, causing coastal uplift and volcanism. The ridge's movement may also have changed the type of faulting along the coast, causing strike-slip faults (faults that move horizontally past each other). Evidence of this subduction altering the course of faulting is found at the Yaquina fault, which, unlike the rest of the Panama Basin faults, trends to the west instead of north-south, indicating that the Carnegie Ridge may be colliding with the continental mass of Ecuador. This collision created northwest-southeast and northeast-southwest-trending faults in the region, and with that, caused strong earthquakes in Riobamba in 1797 and Alausi in 1961. Several of the northwest-southeast-trending faults converge in the Inter-Andean Valley, where the 1949 Ambato earthquake took place.[2]
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