日本語 | English
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Graduate School of Environmental Earth Science, Hokkaido University Faculty of Integrated Environmental Sciences
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Shiro TSUYUZAKI
Plant community ecology / Environmental conservation
Mount Usu / Sarobetsu post-mined peatland
From left: Crater basin in 1986 and 2006. Cottongrass / Daylily
(Update on October 3 2008)
All air-fall pyroclastic materials produced by volcanic eruptions
An example on the classificaiton of tephra by particle size (mm in diameter)
Ash: < 2 (or 4)
Lapilli (volcanic cinders): 2 to 64 (or 4 to 32)
Volcanic blocks: > 64 (or > 32)
Table. Tephra in Hokkaido (in Japanese)