Abstracts
Summary
The May 18, 1980, eruption of Mount St.Helens comprised a complex series ofevents that started with a magnitude 5.1 earthquake. Studies of eye witness photographs and observations provided important information in determining the chronology of events. The eruption has been subdivided into six phases, based on evidence provided by this chronology and detailed stratigraphiework. The first phase, which included thelateral blast, has come under the closest scrutiny, but even here observations of the eye witnesses have provided useful information that must be accounted for in any model of the phenomena.
Download the article in PDF to read it.
Download