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Augustine reported activity

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EVENT SPECIFIC INFORMATION

Event Name : Augustine Lahar West of Southeast Point

Start: 1000 (± 100 Years) Years BP C-14 (raw)
Stop: 710 (± 50 Years) Years BP C-14 (raw)

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

Description: From Waitt and Beget (1996): "Between about 1000 and 700 yr B.P. (between tephra layers C and M) pyroclastic flows, pyroclastic surges, and lahars swept the west and south flanks."

"A lithic lahar (unit CMl) as thick as 2.5 m poured down a broad paleoswale west of Southeast Point. Similar flows poured across the Jurassic bedrock block and channeled down Middle and East Kamishak Creeks to overtop part of South Point debris-avalanche deposit. At the mouth of Middle Kamishak creek the deposit is eroded back into a sea cliff that descends east from 50 to 30 m high with the slope of the fan surface."

"During this prehistoric period numerous domes must have been emplaced at the summit, repeatedly renewing the source for catastrophic debris avalanches. Remnants of these older domes form the east and south sides of the present summit-dome complex. Below the summit area at least three domes were emplaced on the upper flanks, one on the south (Karnishak dome), two on the northwest (domes "I" and "H'). Another undated and nearly buried dome or lava flow diversifies the upper south flank."

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Page modified: March 30, 2017 14:36
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