Okmok reported activity

Event Name : Okmok 2000 yBP

Start: 2000

Years BP Tephrochronology

Tephrafall:

Description: From Beget and others (2005): "One of the most detailed records of explosive volcanism occurs at Kettle Cape, where 24 tephra layers were deposited since the 2,000-year-old pyroclastic flow (fig. 6 [in original text]). This record suggests that explosive eruptions large enough to put acentimeter or more of ash in coastal areas around Okmok Volcano since the second caldera-forming eruption have occurred approximately every 75 years over the last two millennia. This frequency is about twice as high as the recurrence interval estimated for explosive eruptions for the six millennia prior to the 2,000-year-old caldera-forming eruptions, suggesting that a possible increase in eruption frequency and/or explosivity began after the second caldera-forming eruption."