The Lake Mary Fault, situated immediately south of Flagstaff, Arizona, Dave brumbaughrepresents the greatest earthquake hazard to the more than 70,000 people of Flagstaff and environs. In a new video, Dr. David Brumbaugh, Arizona Earthquake Information Center (AEIC) at Northern Arizona University, narrates the, “Lake Mary Fault – Potential Earthquake Threat to Flagstaff, Arizona”. Since the mid-1980’s, Dr. Brumbaugh has studied faults and monitored earthquakes of northern Arizona using the AEIC seismic network.

As Dave Brumbaugh notes in the video, the maximum probable earthquake of the ~ 25 mile long, Lake Mary fault is estimated at magnitude (M) M6.9 to M7.0. An event of that magnitude wouldlake Mary swarm-video have dire consequences for older structures and for unreinforced masonry buildings in the Flagstaff area. And Flagstaff is no stranger to moderate-sized earthquakes. From 1906 to 1912, three magnitude 6.0 to 6.2 earthquakes occurred within 24 miles of the town.

Video LinkLake Mary Fault – Potential Earthquake Threat to Flagstaff, AZ

Mike Conway (9 December 2011)