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Ashfall Research: Insights from Crater Peak and Chaitén Eruptions

This lecture highlights key findings from notable eruptions, including the 1992 Crater Peak/Spurr event and the fallout from the Chaitén eruption in 2008. It presents detailed analyses of ashfall patterns, pyroclastic flow impacts, and the dynamics of subplinian eruptions. Utilizing data from the Alaska Volcano Observatory and MODIS imagery, the lecture explores the distribution of fine and coarse ash, providing vital insights into volcanic ash behavior and its implications for surrounding environments.

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Ashfall Research: Insights from Crater Peak and Chaitén Eruptions

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  1. AVO Photo: Kate Bull Redoubt ashfall Ashfall Blankets Lecture #7 Fall 2009 Ashfall Class

  2. Anchorage ashfall from Crater Peak/Spurr 1992 (AVO photo)

  3. 1992 Crater Peak Spurr AVO photos

  4. MODIS 12 May 2008 Chaiten fallout blanket

  5. Bonadonna & Houghton, 2005, BV 67: 441-456

  6. Bonadonna & Houghton, 2005, BV 67: 441-456

  7. Bonadonna & Houghton, 2005, BV 67: 441-456

  8. Bonadonna & Houghton, 2005, BV 67: 441-456

  9. Overall the Fuego subplinian eruptions have only a few percent of the fine mode, which appears to come from the pyroclastic flow milling. Larger plinian eruptions likely have a much higher proportion of co-PF ash. Rose et al., 2007 BV, in press

  10. Fine mode is located to WNW, while the bulk of the coarse ash is W to WSW HYSPLIT shows that 4 km winds are to WNW while winds at 8-12 km are W and WSW

  11. Voronoi Tesselation Bonadonna & Houghton, 2005

  12. Crater Peak/Spurr, Sept 1992Andesite, Sub-plinian Total GSD

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