A local magnitude (ML) 4.4 earthquake occurred near the town of Paradox, in western Colorado, on 24 January 2013, at 4:46:39 UTC time (23 January 2013, at 9:46:39 p.m. local time) and was strongly felt in nearby communities. Earthquakes this large are infrequent in the region. A search of regional earthquake databases yields just nine previous earthquakes of magnitude 3.5 or larger recorded since 1985, and occurring within 200 km of the January 2013 earthquake epicenter (Fig. 1). Of these nine earthquakes, the epicenters of four are within several kilometers of an active brine deep injection...

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