About 15 minutes ago was a very very minor earthquake (2.3 magnitude) about 8 miles south of Thousand Oaks and 6 miles southwest of Westlake Village.
Here are the preliminary details from the USGS.
Magnitude
2.3
Date-Time
Thursday, October 20, 2011 at 05:50:23 UTC
Wednesday, October 19, 2011 at 10:50:23 PM at epicenter
Location
34.076°N, 118.896°W
Depth
12.3 km (7.6 miles)
Region
GREATER LOS ANGELES AREA, CALIFORNIA
Distances
10 km (6 miles) SW (224°) from Westlake Village, CA
12 km (7 miles) WNW (295°) from Malibu, CA
13 km (8 miles) S (189°) from Thousand Oaks, CA
60 km (37 miles) W (272°) from Los Angeles Civic Center, CA
Location Uncertainty
horizontal +/- 0.6 km (0.4 miles); depth +/- 2.2 km (1.4 miles)
Parameters
Nph= 59, Dmin=11 km, Rmss=0.57 sec, Gp= 94°,
M-type=local magnitude (ML), Version=0