Earthquakes north of Black Canyon City shake up much of Arizona

Notable earthquakes with magnitudes of 4.0 and 4.1 hit a few miles north of Black Canyon City around midnight Sunday, with a foreshock of magnitude 3.2 at 9 pm [top, location map from USGS]   Dr. Jeri Young, who manages the seismic monitoring network run by AZGS, calculates that the location of the mainshock is a few miles further north than reported by the USGS, using information from Arizona stations closer to the events [bottom].


Reports are coming in that the two big shocks were felt from the Grand Canyon to Tuscon and widely across the region [center map.  Source, USGS]

 The M4.1 quake struck at 11:29 pm, local time, with the 4.0 quake hitting at 11:49 pm, Sunday, November 1.    Smaller aftershocks are being recorded although they have been too small to be felt.