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Origin of unconsolidated Quaternary deposits at Harriet Point near Redoubt Volcano, Alaska

September 23, 2021

Unconsolidated boulder-rich diamicton units exposed in sea cliffs at Harriet Point southeast of Redoubt Volcano were evaluated to better understand their provenance relative to the late Quaternary eruptive history of the volcano. A previous study concluded that deposits at Harriet Point were emplaced by a large volcanic landslide originating on the southeast flank of Redoubt Volcano (Begét and Nye, 1994). Field-based analysis of the stratigraphy and sedimentology of the Harriet Point deposits and numerical simulations of the volcanic landslide area of inundation indicate that none of the deposits are volcanogenic. All of the unconsolidated boulder-rich diamicton units at Harriet Point are glacial in origin and can be reconciled using the presently available model for late Quaternary glaciation of Cook Inlet.

Citation Information

Publication Year 2021
Title Origin of unconsolidated Quaternary deposits at Harriet Point near Redoubt Volcano, Alaska
DOI 10.3133/sir20215071
Authors Christopher F. Waythomas
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Scientific Investigations Report
Series Number 2021-5071
Index ID sir20215071
Record Source USGS Publications Warehouse
USGS Organization Alaska Volcano Observatory

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