Another minor earthquake struck the San Ramon Valley Wednesday morning, marking the fourth quake felt in the region during the last week.
The latest earthquake -- with a preliminary magnitude of 3.4 -- was centered about a mile northeast of San Ramon around 9:30 a.m., according to the U.S. Geological Survey. It had a depth of almost 7 miles, according to the USGS.
A 2.9-magnitude occurred outside San Ramon Tuesday afternoon and was felt by some in Danville. Two others shook San Ramon residents Nov. 8 and 9.