Three very small earthquakes shook the Bay Area late Tuesday night and early Wednesday morning.
First, the USGS reported a quake measuring magnitude 1.2 hit just southwest of Alamo at 11:50 p.m. Tuesday.
Less than half an hour later at 12:18 a.m. Wednesday, the USGS measured a quake at magnitude 2.8, about 1.7 miles north of Piedmont, at a depth of 3.3 miles.
There were no immediate reports of damage, but the KTVU newsroom did receive a call from a viewer about the shaking.
An aftershock measuring magnitude 1.0 was recorded at about 2 miles north of Piedmont at 12:45 a.m. Wednesday.