March 27, 2008

3.5 earthquake on the Shivwits Plateau of northwestern Arizona


A small earthquake of magnitude  3.5 occurred at 6:07:13 pm on Wednesday, March 26, 2008.  The earthquake was located on the Shivwits Plateau of northwestern Arizona and was followed by four very small aftershocks over the next 5 hours.  No felt reports of any of the tremors have been received by the Arizona Earthquake Information Center.  The Shivwits Plateau is an area of historically low seismicity.  The only significant events since 1990 have been a swarm of four earthquakes that occurred to the south of the March 26 earthquakes.  These earthquakes occurred from November 7 to November 27th of 1994.  The largest earthquake was a magnitude 3.5.  The locations of the 1994 and 2008 epicenters lie between the Grand Wash and Hurricane faults.