2011 Colorado earthquake

The 2011 Colorado earthquake occurred on August 22 at with a moment [magnitude scale|moment magnitude] of 5.3 and a maximum Mercalli intensity of VII. The epicenter of the intraplate earthquake was west northwest of Trinidad, Colorado, and south of Denver, according to the United [States Geological Survey]. It was the largest natural earthquake to affect Colorado for more than a hundred years.
The earthquake occurred as part of a swarm of smaller quakes that started the previous day. The last time the Colorado region received a series of earthquakes was in 2001, when about a dozen smaller-sized temblors were recorded. The shock occurred as a result of normal faulting and was similar in depth, style and location to the events that made up the 2001 swarm.