霧島火山2008年8月22日噴火の噴出物

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(4) ,*+* + E +2 F. Products of the August ,,, ,**2 eruption of Shinmoedake Volcano, Kirishima Volcanic Group, Japan ῍, Nobuo GESHI῍, Shinji TAKARADA῍, Masaaki TSUTSUI῍ Takehiko MORI῍ and Tetsuo KOBAYASHI῍῍῍ A phreatic eruption occurred on August ,,, ,**2 from Shinmoedake Volcano, one of the members of Kirishima volcanic group, Kyushu, southwestern Japan. Some explosive craters and eruption fissures aligning in E-W direction for 2** meters were formed inside the summit crater and the western flank of Shinmoedake Volcano. These craters produced clay-rich tephra, consisting of non-juvenile lithic fragments with various degree of hydrothermal alteration. Ballistic blocks distribute in an area within 2** meters from the main crater. The total volume of the tephra produced this eruption is evaluated as ,+*2 kg. Distribution of the tephra indicates that the main source of the tephra is S-+1 crater, which is the largest crater located at the center of the crater chain. More than 1*ῌ of the tephra deposit inside the area within + km from the craters, suggesting the low height of the eruption cloud. Absence of the juvenile materials suggests that this eruption was phreatic caused by a rapid release of steam from the hydrothermal system beneath Shinmoedake Volcano. Key words : phreatic eruption, tephra, eruptive volume, Shinmoedake, Kirishima Volcano +ῌ ῐ ῎ ῑ ῏. G

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(28) CD DIA Consultant Co., Ltd., Sabo and Disaster Prevention Division, ,῍,1,῍- Yoshino-cho, Kita-ku, Saitama --+῍20-2, Japan.. 23*῍**0/. !"#$ +῍,+῍-/ !%&%&'(&)*+,)&-. Earth and Environmental Science, Graduate School of Science and Engineering, Kagoshima University, +῍ ,+῍-/ Korimoto, Kagoshima city, Kagoshima 23*῍ **0/, Japan. Corresponding author : Nobuo Geshi e-mail : [email protected].

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(173) (,**+) #$ # $ ++ #%&' !:*;+ (+322) ,-. , / >? 2- ,0῍.+. @A0 (+33.) 12B3"1 E78 +*- .13῍.21. @A0JK<= >?!L (+33,) +33+῍ 3, ! 5DE9PF CA QRS +33, "G ,13῍,30. @A0JK*I J<=K 4 <MN *[\ ]OL% P&^ à b'( R)c; STU + (+330) XYef+ .+ ,+/῍,,/. 9]^ (+3/3) 9],- 1+. _ 1*῍1-. 9]^ (,**/) a, Z- b - c /,.῍/-0. Miyabuchi, Y., Ikebe, S. and Watanabe, K. (,**2) Geological constraints on the ,**-῍,**/ ash emissions from the Nakadake crater lake, Aso Volcano, Japan. J. Volcanol. Geotherm. Res., +12, +03῍+2-. Mori, T., Hirabayashi, J., Kazahaya, K., Mori, T., Ohwada, M.,Miyashita, M., Iino H. and Nakahori, Y. (,**1) A compact ultraviolet spectrometer system (COMPUSS) for monitoring volcanic SO, emmission : validation and preliminary observation., Bull. Volcano. Japan, /,, +*/῍ ++,. q5rLsrvL%wtx u (+330) z +33/ +* ῍+330 + : #5>{ |EQR} (No. *1-***+1) ~! %&QR +33/ +* z gm9! !"f5 ,5%&QR QR6 --῍-3. 9 (,**,) *F. - + E2QR bQR .+ ,,/῍,-0. ! (+3/1) / + #$ - #%&' /2p. cALBT K , D 9 [ ¡¡¢ ELU£;= >{¤ ¢¥x ¨ d¤G ¥¦© 9H !§ {¨ª«¤ ©ª;+c¬« I{![L, (,**+) J¬ ,*** 9®5 7

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(175) (,**/) ³µ %. ,**- +, T99,5

(176) ;¹ , /* .1/῍.23. µ!¸[ c ²¤¶L ¹ ¡L (+331) A¸»º» +330 - 4¼¼ ½ ., .,3῍.-+. @Go .

(177)