Usu formed along the SW boundary of Toya caldera and is shown in this September 2019 Planet Labs satellite (N is at the top). There is a 2-km-wide crater at the top, and within that crater and on the flanks are a scoria cone, three lava domes, and more than ten cryptodomes. Flank collapse possibly occurred around 8-7 ka, emplacing a debris avalanche deposit to the south.

Satellite image courtesy of Planet Labs Inc., 2019 (https://www.planet.com/).

Copyrighted image used with permission. All Rights Reserved. Contact photographer for any usage requests.

Keywords: lava dome

Toya