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Deep earthquakes beneath Mount St. Helens: Evidence for magmatic gas transport?

Science

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Abstract

Small-magnitude earthquakes began beneath Mount St. Helens 40 days before the eruption of 20 March 1982. Unlike earlier preeruption seismicity for this volcano, which had been limited to shallow events (less than 3 kilometers), many of these earthquakes were deep (between 5 and 11 kilometers). The location of these preeruptive events at such depth indicates that a larger volume of the volcanic system was affected prior to the 20 March eruption than prior to any of the earlier dome-building eruptions. The depth-time relation between the deep earthquakes and the explosive onset of the eruption is compatible with the upward migration of magmatic gas released from a separate deep reservoir.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Deep earthquakes beneath Mount St. Helens: Evidence for magmatic gas transport?
Series title:
Science
Volume
221
Issue:
4618
Year Published:
1983
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Science
First page:
1391
Last page:
1394
Number of Pages:
4