At 1:04 AM on the morning of June 10^th, a magnitude 5.2 earthquake hit Borrego Springs, CA, in eastern San Diego County. The earthquake along the San Jacinto Fault triggered hundreds of smaller aftershocks and residents as far away as Los Angeles could feel the shaking. I live approximately 100 miles away from the epicenter, and it woke me up. The earthquake caused renewed discussions among seismologists and the media about whether “the big one” will hit any time soon. We expect earthquakes in Southern California, but when we talk about Oklahoma, it is not a place that usually comes to mind when we think of active earthquake regions in the United States. However, just one day before the magnitude 5.2 quake in California, Oklahoma experienced 3 earthquakes, the largest of which was a magnitude 3.7. These earthquakes in Oklahoma are not an isolated incident. Continue reading →