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The last recorded eruption of Japan's Mount Fuji released some 800 million m3 (28 billion cu ft) of volcanic ash.
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Hōei eruption
Last major eruption of Mount Fuji (1707–08)
The Hōei eruption of Mount Fuji started on December 16, 1707 and ended on February 24, 1708. It was the last confirmed eruption of Mount Fuji, with three unconfirmed eruptions reported from 1708 to 1854. The eruption took place during the reign of Emperor Higashiyama and the…Source: Wikipedia (CC BY-SA)
Mount Fuji
Volcano in Yamanashi and Shizuoka Prefectures, Japan
Mount Fuji is an active stratovolcano located on the Japanese island of Honshu, with a summit elevation of 3,776.24 m. It is the highest mountain in Japan, the second-highest volcano on any Asian island, and seventh-highest peak of an island on Earth.Source: Wikipedia (CC BY-SA)
Volcanic ash
Natural material created during volcanic eruptions
Volcanic ash consists of fragments of rock, mineral crystals, and volcanic glass, produced during volcanic eruptions and measuring less than 2 mm (0.079 inches) in diameter. The term volcanic ash is also often loosely used to refer to all explosive eruption products, including…Source: Wikipedia (CC BY-SA)