Okmok reported activity

Event Name : Okmok 1500 yBP

Start: 1500

Years BP Tephrochronology

Tephrafall:
Pyroclastic flow, surge, or nuee ardente:
Cone:

Description: From Beget and others (2005): "Numerous post-caldera (younger than 2,000 years) pyroclastic flow and surge deposits are found associated with the young tuff cones within the caldera, and distal pyroclastic flow and surge deposits also occur on the west, north, and northeast flanks of Okmok Volcano as far as 14 kilometers from the caldera rim. The thickest set of young surge deposits outside of the caldera occurs on the west flank of Okmok about 8 kilometers from the caldera rim, where deposits of fine-grained surge beds containing incinerated plant remains and abundant accretionary lapilli are more than 6 meters thick. These deposits were emplaced about 1,500 years ago."