2.9 - 31km NW of Grand Canyon Village, Arizona !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

[link to earthquake.usgs.gov]

Worldwide

Exposed in the walls of the Grand Canyon, are numerous faults that document the region’s earthquake – or tectonic – history. Since faults in the Grand Canyon are not only exposed on horizontal surfaces, but also in the walls of the canyon, geologists are provided with a rare opportunity to study what faults look like thousands of feet down into the earth’s crust. Faults are seen cutting through practically every geologic layer in the canyon, from the oldest, two-billion-year-old Precambrian rocks through some of the most recent lava flows less than 10,000 years old.+
[link to www.nps.gov]

Just southeast of Grand Canyon, near Flagstaff, is Sunset Crater Volcano National Monument, where in A.D. 1064 a series of eruptions built the park’s namesake cinder cone. About 45 earthquakes occurred in or near the Grand Canyon during the 1900’s. Of these, five registered between 5.0 and 6.0 on the Richter Scale. Dozens of faults cross the canyon, with at least several active in the last 100 years.

[link to www.nps.gov]

This am
Thread: 4.0 - 70km ESE of Lakeview, Oregon

The first damaging earthquake known to have centered within Arizona's borders occurred on January 25, 1906, the year of the great San Francisco earthquake, and of a damaging series of shocks at Socorro, New Mexico. The shock was violent at Flagstaff, about 115 miles north of Phoenix.

The cumulative terror produced by a series of 52 earthquakes, from September 10 to 23, 1910, caused a construction crew in the Coconino Forest near Flagstaff to break camp and leave the area. Boulders rolled down on their camp from nearby mountains, and the earth maintained a constant quiver. The shocks grew in intensity until September 23, when a very strong shock raged throughout northern Arizona. It was so severe north of the San Francisco Mountains that Indians fled from the region.

[link to earthquake.usgs.gov]