Hōei eruption of Mount Fuji

The nihongo|Hōei Eruption of Mount Fuji|宝永大噴火|Hōei dai funka started on December 16, 1707 ("Hōei 4, 23nd day of the 11th month") and ended about January 1, 1708 ("Hōei 4, 9th day of the 12th month") during the Edo period. [ [http://sk01.ed.shizuoka.ac.jp/koyama/public_html/Fuji/fujid/1707.html Shikuoka University page;] "see" Japanese Wikipedia.] Although it brought no lava flow, the Hoei eruption released some 800 million cubic meters of volcanic ash, which spread over vast areas around the volcano, even reaching Edo almost 100 km away. Cinders and ash fell like rain in Izu, Kai, Sagami, and Musashi provinces. [Titsingh, Isaac. (1834). [http://books.google.com/books?id=Cg8oAAAAMAAJ&printsec=titlepage&dq=editions:OCLC63259938#PRA1-PA416,M1 "Annales des empereurs du japon," p. 416.] ]

The eruption occurred on Mount Fuji's east–north-east flank and formed three new volcanic vents, named No. 1, No. 2, and No. 3 Hōei vents. The catastrophe developed over the course of several days -- an initial earthquake and explosion of cinders and ash was followed some days later with the more forceful ejections of rocks and stones.Smith, Henry. (1988). "Hokusai: One Hundred Views of Mt. Fuji." p. 197.] Mount Fuji has not erupted since.

Hokusai's "One Hundred Views of Mount Fuji" includes an image of the small crater which developed from a secondary eruption site on the southwestern slope. This was called "Hōeizan" because the eruption occurred in the fourth year of "Hōei." [see above] ]

Today the crater can be visited from [http://mountfujiguide.com/guide/Fujinomiya_Trail Fujinomiya Trail] or [http://mountfujiguide.com/guide/Gotemba_Trail Gotemba Trail] of Mount Fuji.

econdary disasters

In the year following the Hōei eruption, a secondary disaster occurred when the Sakawa flooded due to sediment build-up resulting from the ash fall.

Volcanic sands fell and widely covered the cultivated fields east of Mount Fuji. To recover the fields farmers cast volcanic products out to dumping-grounds and made sand piles. The rain washed sand piles from the dumping grounds away to the rivers again and again and made some of the rivers shallower, especially into the Sakawa, into which huge volumes of ash fell, resulting in temporary dams. Heavy rainfall on August 7 and 8, 1708, the year following the Hōei eruption, caused an avalanche of volcanic ash and mud and broke the dams, flooding the Ashigara plain.

Notes

References

* Titsingh, Isaac. (1834). [Siyun-sai Rin-siyo/Hayashi Gahō, 1652] . "Nipon o daï itsi ran; ou, [http://books.google.com/books?id=18oNAAAAIAAJ&dq=nipon+o+dai+itsi+ran Annales des empereurs du Japon] ." Paris: Oriental Translation Society of Great Britain and Ireland.
* Smith, Henry D. (1988). "Hokusai: One Hundred Views of Mt. Fuji." New York: George Braziller. 10-ISBN 0-8076-1453-X; 13-ISBN 978-0-807-61453-2 (paper)

* Source of

ee also

*Historic eruptions of Mount Fuji

External links

* [http://www.bousai.go.jp/fujisan-kyougikai/ 富士山火山防災協議会] (Council for Fuji volcano disaster reduction)
* [http://sakuya.ed.shizuoka.ac.jp/rzisin/kaishi_18/21-Sumiya.pdf 富士山宝永噴火(1707)後の土砂災害(PDF)] (Distribution of sediment disasters after the 1707 Hoei eruption of Fuji Volcano in central Japan, based on historical documents)


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