Patterns of volcanism in the Cascade Arc during the past 15 000 years
Geoscience Canada
By: W. E. Scott
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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
Suggested Citation
Scott, W.E., 1990, Patterns of volcanism in the Cascade Arc during the past 15 000 years: Geoscience Canada, v. 17, no. 3, p. 179-183.
| 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 |