Global Volcanism Program | Image GVP-01496
The summit of Kusatsu-Shirane volcano contains three craters with a turquoise lake in the largest Yugama crater, shown here. Rafts of yellow sulfur float on the surface of the acidic lake. This 1977 view looks across the lake from the SW-most crater (Karagama) to the NE-most crater (Mizugama), located beyond the notch to the left. Small-to-moderate phreatic explosions have occurred from all three craters during historical time.
Photo by Lee Siebert, 1977 (Smithsonian Institution).