Global Volcanism Program | Image GVP-12561
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, 2019.
Keywords: lava dome