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Akutan reported activity





Event Name : Akutan Broad Bight Valley Lahars

This is a questionable event.

Start: 1611 Years BP Tephrochronology

Lahar, debris-flow, or mudflow: BibCard
Eruption Type:Not an eruption.

Description: From Waythomas (1999): "Broad Bight valley is a wide glacial valley on the south side of Akutan Island, southeast of the caldera (Fig. 1 [in original text])."

"Lahar deposits in the middle part of Broad Bight valley (sections 58, 70, 71, Fig. 12 [in original text]) form a downstream thinning fan that covers the valley floor to a depth of at least 2 m. These lahar-runout deposits are distinctly finer grained (largest clasts are pebble size) and contain a greater percentage of fines (silt+clay) than their upstream counterparts. At section 87 (Fig. 12 [in original text]) lahar runout deposits overlie the Akutan tephra. Indicating that most, if not all, of the lahar deposits in Broad Bight valley are younger than the tephra."

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Page modified: March 30, 2017 14:36
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