Global Volcanism Program | Image GVP-02160
Usu volcano is a located on the southern topographic rim of the 110,000-year-old Toya caldera. The summit of the volcano, seen here above the town of Toyako-Onsen to the NW, consists of dacitic lava domes and a cryptodome that were emplaced in a small summit caldera during historical eruptions, most recently during 1977-82. Similar historical eruptions have occurred on the flanks.
Copyrighted photo by Dick Stoiber, 1981 (Dartmouth College).
Keywords: lava dome