Here's some info I just found:
Recent Earthquakes in California and Nevada
== PRELIMINARY EARTHQUAKE REPORT ==
California Integrated Seismic Net
USGS/ Caltech/ CGS/ UCB/ UCSD/ UNR
Version #2: 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.
A light earthquake occurred at 6:11:13 PM (PDT) on Friday, May 1, 2009.
The magnitude 4.4 event occurred 9 km (6 miles) SW of Westlake Village, CA.
The hypocentral depth is 9 km ( 6 miles).
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Magnitude 4.4 - local magnitude (ML)
Time Friday, May 1, 2009 at 6:11:13 PM (PDT)
http://quake.wr.usgs.gov/recenteqs/Quakes/ci10403777.html