August 26, 1997



An earthquake of ML 2.8 struck in the region of Grand Canyon Village late last night. The earthquake occurred at 11:52pm late Monday night. It was preceded at 11:50pm by a ML 2.0 foreshock. Several park rangers at Phantom Ranch reported feeling the larger shock, but no damage was reported. The earthquakes were centered in a region about 72 miles northwest of Flagstaff and about three miles south of the Rim. This area continues to be the most seismically active in Arizona. The South Rim activity began with a a swarm of earthquakes in September 1988, and the largest have included magnitude 4.0 and 4.5 earthquakes that struck the region in March of 1991.

The magnitude 5.4 earthquake that shook northern Arizona in April 1993 occurred about 30 miles south of last night's epicenters near Valle, Arizona.

The data for last night's earthquakes are as follows: