earth faults

Earthquake videos from Arizona Geological Survey

Most earthquakes in Arizona are low magnitude and go unnoticed.  However, there is  potential for a big one.  The Arizona Geological Survey has several videos featuring earthquakes in and near Arizona.  The newest is a time-lapse animation of the Brawley earthquake swarm that occurred on 26-29, August, 2012. Brawley is in southern California, just south of the Salton Sea.

To see this video go to:

That link also contains several other earthquake-related videos (4 to 6 minutes long) so scroll down the page and you will see:

Earthquakes in Arizona

Time-lapse video animation of earthquakes in and around Arizona from 1852 to 2011. The apparent increase in seismic events in the latter part of the 20th century and early 21st century stems from improved seismic monitoring.  It is interesting to see where the most earthquakes occur.

Lake Mary Fault

The Lake Mary Fault, located immediately south of Flagstaff, Arizona, represents the greatest earthquake hazard to the more than 70,000 people of Flagstaff and environs. Dr. David Brumbaugh, Arizona Earthquake Information Center (AEIC) at Northern Arizona University, narrates the, “Lake Mary Fault — Potential Earthquake Threat to Flagstaff, Arizona.”

Little Chino Fault and Big Chino Fault

Filmed on location in Chino Valley, two separate  six minute videos describe the geometry and timing of seismic activity on these faults. This is an active fault area with a moderate recurrence rate on the order of tens of thousands of years. It is capable of yielding earthquakes in the range of magnitude 6 to 6.5 and presents a hazard to residents of Chino Valley and nearby Prescott, Arizona.

Earthquake Monitoring in Arizona, the role of the Arizona Integrated Seismic Network

Arizona has earthquakes. Geologist Dave Brumbaugh and seismic technician Lisa Linville, both of the Arizona Earthquake Information Center (Northern Arizona University), describe the role of the Arizona Integrated Seismic Network in monitoring earthquake activity in the Grand Canyon State. And Lisa deconstructs one of the broadband seismic stations that form the backbone of the system.

The 1887 Sonoran Earthquake

On 3 May 1887, a magnitude 7.2 earthquake rippled across Sonora, Mexico, and southern Arizona. Phil Pearthree, Chief of the Environmental Geology division of the Arizona Geological Survey, revisits that event in this video. The earthquake killed dozens of people and damaged or destroyed several hundred structures. A similar event today would disturb and disrupt population centers in northern Sonora and southeastern Arizona and New Mexico.

For more information on the 1887 earthquake, see my post: The Great Arizona-Sonora Earthquake of 1887

For more information on earthquakes and other geologic hazards, visit the AZGS Geologic Hazards Center: