浅間火山天明噴火：遠隔地の史料から明らかになった降灰分布と活動推移
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(3) º»¬ ¼ ½/ ,*+* B +* C ,/ DEF ,*++ B / C ,* DE>. The +12- Tenmei Eruption of Asama Volcano : Ash-fall Distribution and Sequence of the Eruption Review from Old Documents Masashi TSUKUI῍ The +12- activity of Asama volcano was reviewed from May to the end of the year based on +00 old documents, including those recorded at a distance. +. Prior to the +12- Asama eruption, the level of magma head ascended at Kama-yama crater-pit. Moderately explosive eruptions commenced on May 3, and repeatedly blew o# the plugged magma. ,. Depending on the wind direction, ash fell N, NNE, and NE of the crater including Sado Island, Tohoku and Kanto districts. From August - to /, climactic plinian eruption dispersed pyroclastic materials. Distributions of 2 tephra- fall units were presented. -. The timing of rumbling and quakes at distant places farther than +**km from the crater well correspond with explosive events witnessed by neighbors of the volcano. .. Duration of a single eruptive event rarely exceed 0 hours. It was true even during the culminating plinian stage from Aug. - to /, +12-. The eruption was so violent in this stage that huge blocks larger than +* m were thrown from Kama-yama crater. /. Documents concerning with Kambara pyroclastic flow and subsequent debris avalanche occurred on August /, suggested that an explosion on the northern flank triggered collapse of northern sector. The event occurred at about *2 : ** to *2 : -* am, which is 3* to +,* minutes earlier than estimations appear in previous work. 0. Small and less frequent eruptions continued until January +/, +12.. Key words : Asama volcano, Tenmei eruption, old document, ash -fall, eruption sequence. +ῌ ῐ ῎ ῑ ῏. GH+IJKL%MNOPQ-.. ;RSTU%VW(XY Z[\]+,^_`a(. bc#%?@+,cd +12- BefUghiTU( / . jQkbH# TU+l"^ῌmno%p῎ mq. C 3 Qkr 2 Di hisBtCuQkrvD +wxg. (TUyrY>z"^{ |} ~^ mno+I. gU f QTUr. . QTUr.efg GTUp῎. . TU%f(+Y rYQ- -. ck^ +12- B hisB TU+k(+Y. C% 2 C , D C D ¡¢# 2 C / D C. %p῎~ Aramaki (+3/0, +3/1) £¤ (+33-a, +33-. vD (¥¦῍§ Q¨©ªTU$HKLr. b) «¬s (+32,) ®¬¯ (+331) ®¬ (,**0). i. #T°±Hmq#TUIJ%yrkKLz²r . .³´µ (+33/) (¶·%TUmq%¸¹ / 0,0-῍2/,, 12312456789: +῍-12;<;<=><?@A Graduate School of Science, Chiba University, +῍--, Yayoi-cho, Inage-ku, Chiba, Japan ,0-῍2/,,. ῏ ! " ῏ # $ % & ' ( ) * (+33-) + ,-. Corresponding author : Masashi Tsukui e-mail : [email protected].
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