Akutan reported activity

Event Name : Akutan Late Pleistocene/Early Holocene Caldera

Start: 11700

Years BP Tephrochronology

Tephrafall:
Pyroclastic flow, surge, or nuee ardente:
Caldera/crater:

Description: From Richter and others (1998): "About 2 km southwest of the present caldera, remnants of an older caldera wall, probably of late Pleistocene age, crop out through the extensive tephra and lahar deposits that mantle Akutan’s summit area."

From Miller and others (1998): "The vestige of a larger caldera, of probable late Pleistocene age and at least in part older than the cone of Akutan Peak, extends 1.5 km southwest of Akutan Peak and is terminated to the north by the younger caldera. Small glaciers fill the older crater and lie within the southwest and southeast margins of the younger caldera."

From Waythomas and others (1998): "The age of the eruption that formed the older caldera is not known but is possibly of late Pleistocene or early Holocene age."

From Waythomas (1999): "Remnants of an "older" caldera rim southwest of the present Akutan caldera protrude above a thick mantle of late Holocene pyroclastic-flow and tephra deposits (Fig. 8 [in original text]). Volcaniclastic deposits at the head of Reef Bight (Fig. 8 [in original text]) likely formed during one or more early Holocene eruptions possibly associated with the formation of the "older" caldera."