Akutan reported activity

Event Name : Akutan Hot Springs Valley Lahar

Start: 6000

Years BP Tephrochronology

Lahar, debris-flow, or mudflow:
Geomorphologic change without eruptive cause:

Description: From Waythomas and others (1998): "A slightly clay-rich lahar in Hot Springs Valley (fig. 3 [in original text]) probably formed from a minor collapse of the volcano flank, perhaps in the area of an active fumarole field in the upper part of the valley. No obvious scarp is present. Although not exposed at the coast, this lahar probably reached Hot Springs Bay about 6000 years ago."

From Waythomas (1999): "A cohesive lahar in Hot Springs valley formed from a minor flank collapse of water-saturated, altered rock debris, probably in the area of an active fumarole field in the upper part of the valley. No obvious scarp is present. Although not exposed at the coast, this lahar probably reached Hot Springs Bay approximately 6000 years B.P. Because the lahar deposits in Hot Springs Bay valley originated from a localized slope failure, they are not likely related to any eruption of Akutan Volcano."