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. London: Thera Found.
*Machida H, Arai F (1992) Atlas of Tephra in and around Japan. Univ Tokyo Press, 276p. (in Japanese)
*Simkin T, Siebert L (1994) Volcanoes of the World. Geoscience Press, Tucson AZ, 349p.

Please send your comments to:
mailing list tephra or hayakawa@edu.gunma-u.ac.jp.
Complaints to tephra namings are welcome.


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