Arizona Geological Survey map
This shaded topographic map shows recent earthquake epicenters, including the M 3.5 event of Nov. 25, north of Sedona.

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Arizona earthquake causes minimal damage

Staff Report~ 12/3/2014

NORTHERN ARIZONA – A magnitude (M) 4.7 earthquake shook Sedona and Flagstaff on Nov. 30, at 10:57 p.m. The event occurred about seven miles north of Sedona, near Munds Park. The earthquake and smaller aftershocks are shallow, with depths estimated at 1.3 miles. More than 1,100 people reported feeling the event to the U.S. Geological Survey’s “Did you feel it” online forum at http://earthquake.usgs.gov/earthquakes/eventpage/usb000t1hf#dyfi.

According to Phil Pearthree, Chief of Environmental Geology at the Arizona Geological Survey, “the location is quite close to the Oak Creek fault zone, a down-to-the-east normal fault with 700 feet of vertical displacement in the past 10 million years or so. We think this fault has been active in the past 2 million years, but don’t know how recently it has ruptured in a large earthquake.”

Using the Arizona Integrated Seismic Network to track seismic events, AZGS geologist Jeri Young identified at least 10 aftershocks, three of which approach M 3.0. S

Denny Foulk, Yavapai County Emergency Manager and Rob Rowley, Coconino County Emergency Manager, confirmed that there were no reports of damage to homes or roads. There was one minor rock fall in Oak Creek Canyon that was rapidly cleared.

The largest historical earthquakes in the region, a series of three M 6.0 events, occurred between 1906 and 1912, near Flagstaff, Ariz. More recently, a M 5.1 earthquake occurred in 2005 about 50 miles southwest of this epicenter, and a M3.5 earthquake occurred very close to this epicenter on Nov. 25. Historical earthquake activity for all of Arizona is available online at the interactive Natural Hazards in Arizona Viewer.

For more information on Arizona seismological activity, see http://azgs.az.gov,    http://arizonageology.blogspot.com, and https://www.facebook.com/AZ.Geological.Survey.