Ooh! A wee one.

small jolt (like someone walking heavily) then a bit of a roll… maybe 4-5 seconds long?

http://quake.wr.usgs.gov/recenteqs/Quakes/nc51207740.htm

Version #3: This report supersedes any earlier reports of this event.
This event has been reviewed by a seismologist.

A light earthquake occurred at 9:00:15 PM (PDT) on Friday, September 5, 2008.
The magnitude 4.0 event occurred 3 km (2 miles) ENE of Alamo, CA.
The hypocentral depth is 16 km (10 miles).

Magnitude 4.0 – regional moment magnitude (Mw)
Time Friday, September 5, 2008 at 9:00:15 PM (PDT)
Saturday, September 6, 2008 at 4:00:15 (UTC)
Distance from Alamo, CA – 3 km (2 miles) ENE (77 degrees)
Diablo, CA – 5 km (3 miles) NW (315 degrees)
Danville, CA – 6 km (4 miles) NNW (343 degrees)
Concord, CA – 11 km (7 miles) S (172 degrees)
Oakland, CA – 22 km (14 miles) ENE (69 degrees)
Coordinates 37 deg. 51.9 min. N (37.866N), 121 deg. 59.7 min. W (121.996W)
Depth 16.2 km (10.1 miles)
Location Quality Excellent
Location Quality Parameters Nst=250, Nph=250, Dmin=1 km, Rmss=0.14 sec, Erho=0.1 km, Erzz=0.2 km, Gp=46.8 degrees
Event ID# nc51207740

Older quake info below

Version #0: This report supersedes any earlier reports of this event.
This is a computer-generated message. This event has not yet been reviewed by a seismologist.

An earthquake occurred at 9:00:15 PM (PDT) on Friday, September 5, 2008.
The magnitude ? (not yet determined) event occurred 3 km (2 miles) ENE of Alamo, CA.
The hypocentral depth is 15 km ( 9 miles).

Magnitude ? (not yet determined)
Time Friday, September 5, 2008 at 9:00:15 PM (PDT)
Saturday, September 6, 2008 at 4:00:15 (UTC)
Distance from Alamo, CA – 3 km (2 miles) ENE (78 degrees)
Diablo, CA – 5 km (3 miles) NW (314 degrees)
Danville, CA – 6 km (4 miles) NNW (341 degrees)
Concord, CA – 12 km (7 miles) S (172 degrees)
Oakland, CA – 22 km (14 miles) ENE (69 degrees)
Coordinates 37 deg. 51.9 min. N (37.865N), 121 deg. 59.8 min. W (121.997W)
Depth 15.1 km (9.4 miles)
Location Quality Good
Location Quality Parameters Nst= 25, Nph= 25, Dmin=1 km, Rmss=0.07 sec, Erho=0.3 km, Erzz=0.6 km, Gp=97.2 degrees
Event ID# nc51207740

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