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Novarupta reported activity




Event Name : Resuspension of Novarupta-Katmai ash 2016

Remobilized tephra - no eruption: BibCard
Eruption Type:Not an eruption.

Description: From Cameron and others, 2020: "High northwesterly winds on July 18, 2016, entrained and resuspended ash from the Novarupta and Mount Katmai area toward the southeast. The ash cloud was weakly visible in satellite imagery and was reported by a local pilot to be as high as1,980 m (6,500 ft) ASL (fig. 11). The National Weather Service Alaska Aviation Weather Unit (NWS AAWU) issued a significant meteorological weather advisory (SIGMET) for aviators, and AVO issued an Information Statement. No reports of ashfall on Kodiak Island were received by AVO, and EPA air quality standards were not exceeded in Larsen Bay or Kodiak.

"A two-day ash resuspension event occurred December 2-3, 2016. The cloud reached no higher than 1,800 m (6,000 ft) ASL and was identified in satellite imagery. Observers in Kodiak provided photographs of the approaching cloud (fig. 12). The NWS AAWU issued a SIGMET for aviators, and AVO issued an Information Statement on December 2. The ash was weakly visible in satellite imagery on December 2 and 3, 2016 (fig. 13). Residents of Kodiak reported a fall of fine ash, and samples were collected and sent to AVO for confirmation and analysis. Air quality standards (24-hour standards) were not exceeded in Kodiak, but the event registered unhealthy levels (151–200 micrograms of particulate per cubic meter) on the Larsen Bay particulate monitor (fig. 14).

"On December 31, 2016, hazy conditions were reported in Kodiak during southwesterly winds (fig. 15). A small sample of fallout from the cloud on the city of Kodiak was sent to AVO for confirmation of source material but was inconclusive. No ash cloud was observed in satellite imagery, and therefore, no action was taken by the NWS AAWU, and AVO did not issue a formal Information Statement, because the hazard was considered very low."

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Page modified: March 30, 2017 14:36
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