california earthquake map
This is a map published by the US Geological Survey showing the location of earthquakes in California and Nevada.
Maps are updated within 1-5 minutes of an earthquake or once an hour.
(Smaller earthquakes in southern California are added after human processing, which may take several hours.)
As you can see, earthquakes are quite normal in the region, but the vast majority are so light that they are not detected except by instruments. Not the case today, obviously.
Here is the shake map of today's quake in southern California, Los Angeles area.
The USGS's report of the main quake today is,
A moderate earthquake occurred at 11:42:15 AM (PDT) on Tuesday, July 29, 2008. The magnitude 5.4 event occurred 4 km (3 miles) WSW of Chino Hills, CA.The hypocentral depth is 14 km ( 8 miles).
No doubt more shakes will continue for the next day or two.
