Wednesday, December 14, 2016
Suddenly Big Blue Boxes
Paso Robles, CA, and another M4.0 associated with an ongoing earthquake swarm at Long Valley Caldera near Mammoth Lakes, CA, and finally a M5.0 event in the Geysers Geothermal Field in Northern California. It was located about 6 miles northwest of the center of the geothermal field. It occurred at a depth of just about a mile down so this might have generated short ground rupture if it happened along a fault that reaches the surface. This is the largest earthquake ever located here and relates to water injection for purposes of producing steam to generate electricity.