史料にもとづく桜島火山1779年安永噴火の降灰分布

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(3) ,*+* +, ,1 ,*++ / ,1 . Ash-Fall Distribution of +113 An’ei Eruption, Sakurajima Volcano Revealed by Historical Documents Masashi TSUKUI Old historical documents on +113 AD An’ei eruption of Sakurajima, southwest Japan were collected from distal places as well as those from neighboring area of the volcano. These records revealed that the ash-fall front traveled to the northeast at about /*῍+** km/h, reached as far as Tohoku district +,** km from Sakurajima, and covered area of ca. ,.-- +*/ km,. Investigation of old documents helped to improve understanding of behavior of the volcano and environmental e#ects at the time of infrequent and great eruption. The wide distribution of ash-fall in +113 Sakurajima eruption suggests that there is a high potential that ash discharged by future eruption of Sakurajima may cover down through the mainland of Japan. We should keep in mind both physical and economical e#ects of ash-fall in assessing the activity and making the scenario of an eruption. Key words : Sakurajima volcano, An’ei eruption, old documents, ash-fall,. .

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(6) ,0-῍2/,, +῍- Graduate School of Science, Chiba University, +῍--, Yayoi-cho, Inage-ku, Chiba, Japan ,0-῍2/,,. Corresponding author : Masashi Tsukui e-mail : [email protected].

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(35) +113 M NO Appendix. Bibliography on the +113 A.D. An’ei Sakurajima ash-fall, and description of the eruption. (a) O$cial (daily) reports of regional government, o$ce, temples or shrines. (b) Personal records of regional o$cials. (c) Records of local government o$cials or knowledgeable individuals. (d) Disaster and observation reports to regional and local government. (e) Others or not clear. * : original record in manuscript (or its copy). .

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