On September 30th at 4:31 a magnitude 7.1 in Columbia. This earthquake occurred as a result of faulting deep within the subducting Nazca slab. The earthquake ruptured a fault in the interior of the inclined subduction zone that dips to the east-southeast beneath South America, having begun its decent into the mantle at the South America trench offshore of Colombia and Ecuador.
The event resulted from stresses generated by the slow distortion of the sub ducting plate as it descends through the mantle, rather than on the thrust interface that constitutes the boundary between the Nazca and overlying South America plates; the latter is active only near the Earth's surface, while the sub ducting Nazca plate generates intraplate earthquakes to depths of 200 km or more in this region. At the latitude of this event, the Nazca plate moves east-northeast with respect to the South America plate at a rate of approximately 60 mm/yr. (USGS)
These maps show the intensity as well as severity of the earthquake. They give helpful information such as surrounding earthquakes, intensity, depth and exact coordinate of the epicenter.
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