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,**/  .  ,1  ,**0  +  1 Time Variation of Volcanic Plume Related with the Eruptions of Asama Volcano in ,**.
Tsuneomi KAGIYAMA῍ and Etsuro KOYAMA῍῍Asama Volcano had a series of eruptions from September + to November +., ,**.. We have carried out
infrared observation at the eastern foot of the volcano since August ,**,, and have succeeded in capturing
successive plume imageries. We examined long term and short term variation in volcanic plumes related with the,**. Eruptions.
We examined long term variation of the plume height from January to November ,**., and found two
di#erent kinds of correlation between the plume height and other volcanic activities ; the increase in plume height
followed by the eruption with a long time delay, and that followed by the eruption promptly. The plume heightturned to increase gradually in March and May with the increase of the A-type earthquakes and gradual inﬂationsuggesting supply of magma in the deeper part, and the height increased anomalously from July ,/ with rapid
inﬂation suggesting magma migration to the shallower part. These anomalies were followed by the ﬁrst eruption
on September + about .* days after. Erupted products included some juvenile materials, but the major part of the
products were lithic materials. The plume height became lower just after the eruption, but turned to increase
from September +, following the increase of A-type earthquakes. The second eruptive stage started from
September +., , days after the increase of the plume height. Three small eruptions occurred on September +.,and many small eruptions occurred successively from September +0 to +1. The erupted products were mostly well
vesiculated juvenile materials. This evidence suggests that the eruptions in the second stage occurred with much
volcanic gas, while the ﬁrst eruption occurred after degassing from magma.
We examined short term variation of the volcanic plume during the developing stage of the successive minor
eruptions ; from ** : /1 a.m. to *2 : ** a.m. on September +0. We got time series data of the average temperatureon the certain vertical line segment, which is crossed by moving volcanic plume, and examined spectrums. As aresult of analysis, some power peaks were conﬁrmed at the multiples of *.**,/ Hz until . a.m. And this peak wasfound to move to higher frequency according to the eruptive activity ; *.**-, Hz at 1 a.m. One possible reason isthat Asama Volcano has some resonance beneath the crater (conduit), and the characteristic length of the conduit
changed to be shorter during the successive minor eruptions. Japan Meteorological Agency reported the numberof eruptions increased from . a.m., and Geographical Survey Institute found a lava cake within the crater about++ a.m. These evidences suggest that magma ascended within the conduit around . or 1 a.m., and may beconsistent with our analytical results.
Key words : Asama Volcano, eruption, volcanic plume+ῌ ῐ ῎ ῑ ῏) &*+,*-. /01& 23  !"!" #$%$%&'(

456789*:+;$%$%&<'(!=*>203ῌ+.*. ?@ABCDEBCFGH /,2*IJKLKLMLNOPQRSLNOTUNOVWXY
Aso Volcanological Laboratory, Graduate School of
Science, Kyoto University, Minami-Aso, Aso, Kumamoto 203ῌ+.*., Japan.
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Asama Volcano Observatory, Earthquake ResearchInstitute, University of Tokyo, Nagakura-Yama, Karuizawa, Nagano -23ῌ*+++, Japan.
Corresponding author : Tsuneomi Kagiyama
e-mail : kagiyama@aso.vgs.kyoto-u.ac.jp

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Fig. ,. Infrared imagery of volcanic plume in Asama Volcano (+2 : .+, March ., ,**.).

Fig. +. Map of Asama Volcano and position of theInfrared Camera (solid circle).

Table +

77

Speciﬁcations of infrared imagery.

Items

Speciﬁcations

Spectral range
Field of view
Detector
Spatial resolution
Temperature resolution

2 to +. mm,/42º (H) +34/º (V)-,* (H)»,.* (V)Uncooled Microbolometer+4. mrad.
*4+o ,**-

3

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78

Fig. .. Daily mean of the plume height of Asama Volcano from January to November, ,**..
dicate middle size explosions, small arrows indicate minor eruptions.

 

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79

Fig. /. Variation of the plume height from September + to +* (a) and ++ to ,* (b), ,**.. Large arrow indicatesmiddle size explosion, small arrows indicate minor eruptions. Many minor eruptions occurred from +/ to +2(closed circles).

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81

Fig. 2. Temperature proﬁles on the vertical line segments in Fig. 1.
Fig. 1. Infrared imagery of volcanic plume in Asama Volcano on September +0, ,**.. a : */ : // :-/, b : */ : // : .*, c : */ : // : ./.

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82

Fig. 3. Variation of the average temperature on the vertical line segments indicated in Fig. 1 from *- : -0 to *. :.2 on September +0 ; a : the average temperature on the line +, b : average temperature of the line ,, and c :di#erence of the average temperature between lines + and ,.



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83

Fig. +*. Variation of the average temperature on the vertical line segments from *. : .2 to *0 : ** on September+0. Lines a, b and c indicate the same meanings as Fig. 3.

Fig. ++. Variation of the average temperature on the vertical line segments from *0 : ** to *1 : +, on September+0. Lines a, b and c indicate the same meanings as Fig. 3.

Fig. +* 

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84Fig. +,. Power spectrum of the temperature variation from - : /* to *. : +,. No signiﬁcant power is found.

Fig. +.. Power spectrum of the temperature variation from *0 : ./ to *1 : *0. Signiﬁcant powers
are identiﬁed at *.**-, Hz (-+* s) and its multiples.

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Fig. +/. Change of power spectrum during the evolution stage of the successive minor eruptions from ** : /1 to*1 : -/ on September +0, ,**..

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Fig. +0. Daily frequency of the earthquakes in Asama Volcano. a : Number of earthquakes except the A-type, b :number of the A type earthquakes. Large arrows indicate middle size explosions, small arrows indicate minor
eruptions.

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N. and Utunomiya, T. (+31*) Seismometrical studies ofVolcano Asama, Prat +. Bull. Earthq. Res. Inst., .2, ,-/ῌ-*+.
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