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Patterns of volcanism in the Cascade Arc during the past 15 000 years

Geoscience Canada
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Abstract

About 110 well-dated and 70 poorly dated eruptive periods less than 15 000 years old at individual volcanoes in the Cascade Arc constitute a data set for identifying spatial and temporal patterns of eruptive activity. Key features of the record include: 1) the mean frequency of eruptive periods during the past 4000 years is approximately two per century; however, the variance about the mean may be large; 2) at most major centres, episodes of activity lasting several thousand years are defined by groups of eruptive periods separated by apparent dormant intervals of roughly similar duration, 3) arc-wide clustering of eruptive activity may exist at 0-4 ka, 6-8 ka, and 10-14 ka. Such clustering would be remarkable in light of significant along-arc changes in crustal structure, stress field, and subduction-zone geometry. -Author

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Patterns of volcanism in the Cascade Arc during the past 15 000 years
Series title Geoscience Canada
Volume 17
Issue 3
Year Published 1990
Language English
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Geoscience Canada
First page 179
Last page 183