Two small quakes hit about 8 miles west of Kaibab, Arizona, just south of the Utah border, yesterday (Thursday). A magnitude 2.2 quake occurred just before noon, local time, followed a few hours later by a M=1.8 event. The area has historical seismic activity associated with the southern end of the Intermountain Seismic Belt. [right, quakes shown as small yellow boxes. Credit, USGS]
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