https://www.mercurynews.com/2019/04/18/cluster-of-earthquakes-shakes-santa-cruz-mountains/ > BOULDER CREEK — A cluster of earthquakes shook the Santa Cruz Mountains on Thursday afternoon, according to the U.S. Geological Survey. > Less than 20 seconds separated the two largest quakes, which hit about 2:35 p.m. near Boulder Creek. The first, a magnitude 2.8, was centered about 12.5 miles west-northwest of the town and the second, a magnitude 2.5, was centered about 13 miles in the same direction.