since 1997.4.2.
Hayakawa's one million-year tephra catalog
as of 1996.12.4
Go to one million-year tephra database, Aug. 2008
· World (>M6.0; 193 tephras)
· Japan (933 tephras)
· Hokkaido (118 tephras); Nihongo (127 tephras) as of 1999.1.22
· Tohoku (145 tephras); Nihongo (147 tephras) as of 1999.1.22
· Chubu and Northern Kanto (306 tephras); Nihongo (334 tephras) as of 1999.1.22
· Southern Kanto (301 tephras); Nihongo (316 tephras) as of 1999.1.22
· Chugoku and Kinki (55 tephras); Nihongo (55 tephras) as of 1999.1.22
· Kyushu(134 tephras); Nihongo (152 tephras) as of 1999.1.22
* Age is in 1000 years going
back from 2000 AD.
* M is Magnitude. It is defined as M = log m - 7, where m is the mass of tephra
in kg. Lava not included.
* MIS is Marine Isotope Stage.
REFERENCES:
*Decker RW (1990) How often does a Minoan eruption occur? In Thera and the
Agean World III, ed. DA Hardy 2: 444-452.
*
*Simkin T, Siebert L (1994) Volcanoes of the World. Geoscience Press,
Please send your comments to:
mailing list tephra or hayakawa@edu.gunma-u.ac.jp.
Complaints to tephra namings are welcome.