April 1980 was a month to remember at Mount St. Helens

Measuring tilt in Timberline parking lot in early April 1980 during lightly falling snow. USGS photo by Don Swanson.

Mount St. Helens was exploding! The first eruption in the Cascades since 1914­-17 (Lassen Peak) started on March 27, 1980. April became a frenzied, exciting, challenging, sometimes frustrating, once-in-a-lifetime experience for several scientists with experience at the U.S. Geological Survey (USGS) Hawaiian Volcano Observatory (HVO), called on to measure the deforming volcano.