November 1, 1998

SOUTH RIM, GRAND CANYON, AND TUBA CITY REGIONS

A magnitude 3.4 earthquake struck the South Rim area of the Grand Canyon yesterday evening October 31^st at 8:24 pm local time. The earthquake was centered about 3 miles southwest of the Grand Canyon Village. The South Rim area continues to be the most seismically active region of Arizona, including earthquakes in March 1992 with magnitudes of 4.0 and 4.5. The magnitude 4.9 and 5.4 earthquakes of April 1993 occurred 20 miles south of last night's epicenters.

The South Rim earthquake data are as follows:

Magnitude (M_L) 3.4 Saturday, October 31, 1998 8:24 p.m. 36.049N x 112.220W

In addition, a magnitude 3.4 earthquake struck the Tuba City region early Sunday morning October 18^th at 12:13 am. The epicenter was 15 miles southeast of Tuba City. That earthquake was felt by several residents of Tuba City, but occurred in a region where we have not previously detected earthquakes.

The Tuba City earthquake data are as follows:

Magnitude (M_L) 3.4 Sunday, October 18, 1998 12:13 a.m. 36.028N x 111.088W