September 4, 2009

Wild Bend Earthquake


A magnitude 3.5 earthquake struck about 25 miles south of Colorado City, Arizona at 4:48 a.m. local time.  The earthquake was felt by residents of Pipe Springs National Monument.  At 4:53 a.m. a magnitude 2.8 aftershock occurred about 2 miles north of the main shock.  The earthquakes are located in the area of the Toroweap fault zone and a preliminary focal mechanism suggests normal faulting on a northeast trending fault.   


The earthquake data are as follows: