| Caption: |
Diagrams and photographs showing the sequence of events for the May 18, 1980, eruption of Mount St. Helens. Photographs (b) and (c) of the lateral blast were taken less than 10 seconds apart. [Photographs (b) and (c) ©1980 by Keith Ronnholm, the Geophysics Program, University of Washington, Seattle; Photograph (d) from Roger Werth/Woodfin Camp and Associates. Drawings inspired by a lecture by James Moore, U.S. Geological Survey] |
| Keywords: |
volcanoes, volcanism, volcanic eruptions, lavas, composite cones, stratovolcanoes, Cascade Range, Cascades, Mount St. Helens, pyroclastic flows, mass wasting, movements, pyroclastics, mudflows, lahars |
