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GIS-based Quantitative Assessment for Hazard Area of Gigantic Volcanic Eruptions in Japan῍,
Takahiro YAMAMOTO῍, Tatsuro CHIBA῍῍, Yoshinori MATSUNAGA῍
Akira MIYAMOTO῍῍ and Michihisa TANAKA῍῍
High-level radioactive waste has to be disposed in a stable geological formation at a depth of more than -**meters. Infrequent geological and climate processes and their e#ects, however, can not be perfectly ignored in+*/- to +*0-years long-term future assessments. Therefore, we must evaluate the hazard area and probability of
infrequent disruption which will not be excluded by the selection program of the ﬁnal repository site. This study
deals with gigantic volcanic eruptions, forming large collapse calderas, as one of the assessments and constructs the
GIS-tool for its scenario analysis. Our GIS-tool is composed of (+) database of eruptive history of large-caldera
volcanoes in Japan during Quaternary time and (,) program to calculate two-type circular hazard areas. The
ﬁrst hazard area is deﬁned as a crustal deformation zone due to growth of the magma chamber using a sill model.
The second hazard area shows a run-out distance of a large-volume of pyroclastic ﬂow on the ground using asubcritical ﬂow model (Bursik and Woods, +330).
Key words : caldera, pyroclastic ﬂow, high-level radioactive waste, hazard area, GIS+ῌ ῐ ῎ ῑ ῏+T(NGUV):WXY +* $ZL*[++F/ \]^_,`-.a/+0b1+Qcd +*:;<=<>?@AB  !CD ,**- 2

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>¯WpqG)o:wG °c_±²d_<=³e+3e:5´ Lµ?@W <=+1YT+*/ῌ***+   -ῌ+1ῌ+   

Japan Nuclear Energy Safety Organization, Safety
Standard Division, -ῌ+1ῌ+, Toranomon, Minato-ku,
Tokyo +*/ῌ***+, Japan)*+, : -*/ῌ2/01 -./  +ῌ+ῌ+ 0 11234567,8967
Geological Survey of Japan, AIST. Central 1, Higashi+ῌ+ῌ+, Tsukuba -*/ῌ2/01, Japan,+/ῌ***.  ! +ῌ,ῌ,"#"$%&'(
Asia Air Survey Co. Ltd, +ῌ,ῌ,, Manpukuji, Asao-ku,
Kawasaki, Kanagawa ,+/ῌ***., Japan
Corresponding author : Takahiro Yamamoto
e-mail : t-yamamoto@aist.go.jp567  89!:" ;#$ <74

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75

Fig. +. The ﬁrst page of the GIS system for hazard area of gigantic volcanic eruptions in Japan.
triangles show caldera volcanoes on the Red Relief Image Map for the Japan islands.
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76

Fig. ,.

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77

Fig. -. Basic concept for hazard area of a gigantic volcanic eruption forming a large collapse
caldera. Schematic sections of caldera collapse are taken from Whitney and Stormer (+320).
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Fig. .. An output image of pre-caldera uplifting area
for the Aso . pyroclastic ﬂow case (magma
volume : -** km-DRE ; depth of magma chamber :+/ km). W and r are vertical dislocation andradius of uplifted area, using sill model.
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km- DRE ; eruption time : .**** s), using Bursik
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]Y{"@ῐ ῕ ῔ ῑAcocella, V. (,**1) Understanding caldera structure anddevelopments : an overview of analogue models compared to natural calderas. Earth Sci. Rev., 2/, +,/ῌ+0*.
Bursik, M.I. and Woods, A.W. (+330) The dynamics andthermodynamics of large ash ﬂows. Bull. Volcanol., /2,+1/ῌ+3Connor, C.B. and Hill, B.E. (+33/) Three nonhomogeneous
Poisson models for the probability of basaltic volcanism :application of the Yucca Mountain region, Nevada. J.
Geophys. Res., +**, +*+*1ῌ+*+,/.
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Perry, F.V., Valentine, G.A., Desmarais, E.K. and WoldeGabriel, G. (,**+) Probabilistic assessment of volcanic
hazard to radioactive waste repositories in Japan : intersection by a dike from a nearby composite volcano.
Geology, ,3, ,//ῌ,/2.
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Sheridan, M.F. (+33,) A Monte Carlo technique to estimate the probability of volcanic dikes : high-level radioactive waste management. In : Proceedings of the Third
Int. Conf., +33,, Las Vegas, Nevada, ,*--ῌ,*-2.
Sigurdsson, H. and Carey, S. (+323) Plinian and coignimbrite tephra fall from the +2+/ eruption of Tambora
volcano. Bull. Volcano., /+, ,.-ῌ,1*.
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Smith, E.I., Keenan, D.L. and Terry, P. (,**,) Episodic
volcanism and hot mantle : implications for volcanic
hazard studies at the proposed nuclear waste repository
at Yucca Mountain, Nevada. GSA Today, +,, .ῌ3.
Smith, R.L. and Bailey, R.A. (+302) Resurgent cauldrons.
Geol. Soc. Am. Mem., ++0, 0+-ῌ00,.

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Sun, R. J. (+303) Theoretical size of hydraulically induced
horizontal fractures and corresponding surface uplift in
an idealized medium. J. Geophys. Res., 1., /33/ῌ0*++.
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Whitney, J.A. and Stormer, Jr., J.C. (+320) Model for the
intrusion of batholiths associated with the eruption oflarge-volume ash-ﬂow tu#s. Science, ,-+, .2-ῌ.2/.
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