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Global Volcanism Program | Image GVP-02150

Usu rises at the right across Lake Toya with the Nakanojima lava dome complex at the left forming an island in the caldera lake. The light-colored area in the bottom half of this 12 August 1977 photo is floating pumice produced by explosive eruptions of Usu during 7-9 August. Photo by Lee Siebert, 1977 (Smithsonian Institution).

Usu rises at the right across Lake Toya with the Nakanojima lava dome complex at the left forming an island in the caldera lake. The light-colored area in the bottom half of this 12 August 1977 photo is floating pumice produced by explosive eruptions of Usu during 7-9 August.

Photo by Lee Siebert, 1977 (Smithsonian Institution).

Keywords: pumice | lava dome | lake | caldera


Toya