Tonight we had yet another 3 mag plus earthquake within a short period of time at Covington Flat volcano, which is just south of the town of Yucca Valley, CA.
The earthquake was 6 miles down, where is is likely hot magma.
This volcano is a part of the eastern California rifting zone, a spreading zone that will eventually break western California away from the mainland, much in the way Baja California split off from mainland Mexico. This break off will be complete in about 10 million years.
Here's the link to the USGS summery of today's event: