Lots of us got an early wake-up call Thursday when a 3.9 earthquake hit in the East Bay.
The quake happened at 5:36 a.m. two miles east of Berkeley.
There were no reports of damage, but lots of people felt it.
The UGSG said it happened on the Hayward fault, which is the same fault as several other small quake in the past several days.
The initial 3.9 was downgraded to 3.6 by the USGS.
Here are the exact statistics from the quake from the UGSG:
Depth 9.7 km (6.0 miles)
Region SAN FRANCISCO BAY AREA, CALIFORNIA
2 km (1 miles) E (87Â°) from Berkeley, CA
4 km (3 miles) ESE (118Â°) from Albany, CA
4 km (3 miles) SSE (147Â°) from Kensington, CA
9 km (6 miles) NNW (347Â°) from Oakland, CA
Location Uncertainty horizontal +/- 0.2 km (0.1 miles); depth +/- 0.4 km (0.2 miles)
Parameters Nph= 83, Dmin=1 km, Rmss=0.17 sec, Gp= 29Â°,
M-type=regional moment magnitude (Mw), Version=5
It was the second earthquake in California overnight. A magnitude-4.8 earthquake struck the Sierra Nevada.
The USGS said that earthquake hit at 11:37 p.m. Wednesday and was centered nine
miles south-southeast of Whitehawk, about 90 miles northeast of Sacramento and 30 miles west of Reno, Nev.
That puts Truckee in the target zone.