Earthquake Swarm strikes near Mount St. Helens

A series of earthquakes, known as an earthquake swarm, struck at 10:35 a.m. on Monday a couple of miles north of the Mount St. Helens.The initial earthquake measured at a 4.3 magnitude and the aftershocks ranging between 1.0 and 2.8 in magnitude. At least 12 small earthquakes were registered in the area since teh first quake on Monday. According to the United States Geological Survey (USGS) swarms are especially common around volcanoes and are often reliable methods of predicting an eruption. The USGS will closely monitor Mount St. Helens in the upcoming weeks.

http://news.yahoo.com/s/ac/20110216/sc_ac/7864744_usgs_watching_mount_st_helens_volcano_following_earthquake_swarm