bulk sample of curd-like gray ashfall in 1 cm firn snow zone underlying 6-7 cm fresh snow. Collected on 2-19-2017 from northwest side of Unalaska Island (Event 29 deposited on 1-31-2017)
Petrology of the 2016-2017 eruption of Bogoslof Island, Alaska
This website is supported by the U.S. Geological Survey under Cooperative Agreement Grant G19AC00060 and G19AC00171.
Mention of trade names or commercial products does not constitute their endorsement by the U.S. Geological Survey.