The USGS reports a magnitude 2.2 earthquake at 10:21 am local time this morning, on the Arizona side of Lake Mead, near Boulder City, Nevada.
The Arizona Republic ran a story saying the USGS reported a M2.4 quake occurred 47 miles northwest of Kingman at 12:04 pm. However, that does not appear on the USGS earthquake website, and Lisa Linville at the Northern Arizona University Earthquake Information Center cautions that this event may be a man-made blast instead.