The city of Flagstaff sits among some of the most beautiful western scenery to be seen anywhere, with graceful Ponderosa pines and the San Francisco Mountain nearby (both shown above). But the Lake Mary fault is a potential hazard in this idyllic setting, that could unleash a 6.9 magnitude earthquake in the area. Other large quakes were felt in here in 1906, 1910, and 1912. Their magnitudes were 6.0 and 6.2.
Watch a five minute video with Dr. David Brumbaugh who explains many of the particulars about this Falgstaff geo-feature:
http://www.youtube.com/watch?v=vi3TVP8l7rc
Map of the Lake Mary Fault system, courtesy of the Arizona Earthquake Information Center at Northern Arizona University
I guess volcanoes usually mean faults somewhere. Very interesting to see on the map.
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