We're experiencing a second earthquake swarm at the Salton Buttes volcano, in Imperial County, CA. If you look at the cluster of small earthquakes at the south end of the lake, you are looking at the swarm. Also note that this is the fourth swarm in the Imperial County, and the rift zone that is there. Something is indeed going on with our rift zone. A rift is a place where the crust is spreading apart, and is host to volcanism and earthquakes. One of my ping pong balls I had set up fell from it's place on a table, and the way its set up, this is an indicator of movement.
California-Nevada Fault Map centered at 34°N,116°W
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