Cascades Volcano Observatory (CVO)

Mount St. Helens and Mount Rainier, northern aerial view
March 2, 2016

The CVO staff conduct research on many aspects of active volcanism, respond to dangerous volcanic activity in many parts of the world, and maintain a close watch over volcanoes in Washington, Oregon and Idaho. The USGS established CVO in Vancouver, Washington, after the May 18, 1980, eruption of Mount St. Helens.