Mount St. Helens bursting with ash Last Updated Tue, 08 Mar 2005 21:51:46 EST CBC News SPOKANE, WASHINGTON - Mount St. Helens in Washington state has erupted, sending a plume of steam and ash 7,600 metres into the air. Government scientists say they measured an earthquake of magnitude 2.0 beneath the mountain when the first plume of smoke went up Tuesday. The volcano has been active in previous months. A minor eruption lasted 24 minutes last October, sending up 3,000 metres of steam and ash. The U.S. Geological Survey detected magma moving below the surface, along with the increased presence...