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Late Holocene history of Chaitén Volcano: new evidence for a 17th century eruption

Andean Geology

By:
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DOI: 10.5027/andgeoV40n2-a04

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Abstract

Prior to May 2008, it was thought that the last eruption of Chaitén Volcano occurred more than 5,000 years ago, a rather long quiescent period for a volcano in such an active arc segment. However, increasingly more Holocene eruptions are being identified. This article presents both geological and historical evidence for late Holocene eruptive activity in the 17th century (AD 1625-1658), which included an explosive rhyolitic eruption that produced pumice ash fallout east of the volcano and caused channel aggradation in the Chaitén River. The extents of tephra fall and channel aggradation were similar to those of May 2008. Fine ash, pumice and obsidian fragments in the pre-2008 deposits are unequivocally derived from Chaitén Volcano. This finding has important implications for hazards assessment in the area and suggests the eruptive frequency and magnitude should be more thoroughly studied.

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Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
Late Holocene history of Chaitén Volcano: new evidence for a 17th century eruption
Series title:
Andean Geology
DOI:
10.5027/andgeoV40n2-a04
Volume
40
Issue:
2
Year Published:
2013
Language:
English
Publisher:
Servicio Nacional de Geología y Minería
Publisher location:
Santiago, Chile
Description:
13 p.
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Andean Geology
First page:
249
Last page:
261
Country:
Chile
City:
Chait�n
Other Geospatial:
Chait�n Volcano