Global Volcanism Program | Image GVP-01424
Volcanic bombs ejected during the latest eruption of Mount Fuji in 1707 within light-colored tephra from the older Ko-Fuji volcano. These blocks, about 30 cm in diameter, impacted the surface of the older tephra deposits near the rim of the 1707 Hoei crater. Erosion by strong winds removed the softer, hydrothermally altered tephra, leaving the blocks above the surface.
Photo by Lee Siebert, 1977 (Smithsonian Institution).