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Mount St. Helens eruptive behavior during the past 1500 yr.

Geology

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Abstract

During the past 1500 yr Mount St. Helens, Washington, has repeatedly erupted dacite domes, tephra, and pyroclastic flows as well as andesite lava flows and tephra. Two periods of activity prior to 1980, each many decades long, were both initiated by eruptions of volatile-rich dacite which were followed by andesite, then by dacite. A third eruptive period was characterized by the eruption of volatile-poor dacite that formed a dome and minor pyroclastic flows. The prolonged duration of some previous eruptive periods suggests that the current activity could continue for many years. The volatile-rich dacite that has been erupted to date probably will be followed by gas-poor magma, but it cannot yet be predicted whether a more mafic magma will be extruded during the current eruptive period.-Authors

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Mount St. Helens eruptive behavior during the past 1500 yr.
Series title:
Geology
Volume
8
Issue:
11
Year Published:
1980
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
First page:
555
Last page:
559
Number of Pages:
5