Aftershock hits near spot of Easter quake
An aftershock with a preliminary magnitude of 4.1 rocked eastern San Diego County at 9:09 a.m. Saturday.
The automated California Integrated Seismic Network placed the epicenter
30 miles south-southeast of Calexico, at the same approximate spot as the epicenter of the magnitude 7.2 Easter Sunday earthquake.
Seismologists have said the rash of noticeable aftershocks from the big
quake - more than 4,000 - is normal for a large earthquake.