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Crustal Deformation and Surface Temperature Distribution Observed by
Remote-Sensing Techniques after the ,**, Izu-Torishima Eruption
Yutaka WADA, Tetsuya JITSUFUCHI, Hiroshi OHKURA and Motoo UKAWA
The volcanic island, Izu-Torishima, erupted in August, ,**,. The National Research Institute for Earth
Science and Disaster Prevention observed the crustal deformation and surface temperature distribution of theisland after the eruption by using remote-sensing techniques of Interferometric Synthetic Aperture Rader (InSAR)
and airborne Multi-Spectral Scanner (MSS). The InSAR image from RADARSAT-+ data acquired about +/and .* days after the eruption exhibits no large deformation exceeding several centimeters for the entire island,showing the limit of the analysis without any ground control points (GCPs). However, a small local movement(less than ,.2 cm) is observable at the center of the island. The airborne MSS, VAM-3*A, obtained the surface
temperature distribution from infrared bands and pseudo-color images from visible and near-infrared bands almost
one year after the eruption. The high-temperature area (over 1*C) is limited around the central crater, where
the ground surface is covered by sublimed sulfur. The highest temperature of 2*C is detected in this area.
Key words : Izu-Torishima ,**, eruption, remote sensing, InSAR, multi spectral scanner+  
,**,2

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 ²-*/ῌ***0 ³´µ5wt¶E·¸ -ῌ+F¹)"º»'(¼
National Research Institute for Earth Science andDisaster Prevention, -ῌ+, Tennodai, Tsukuba City,

Ibaraki Pref. -*/ῌ***0, Japan.
Corresponding author : Yutaka Wadae-mail : y-wada@bosai.go.jp

ef ghijklhNm nhop/q64

Fig. +. Topographic map of Izu Torishima. We
used a map extracted from “+ : ,/,*** Scale
Topographic Map”, issued by the Geographical
Survey Institute English texts, arrows, northarrow, and scale are edited by the authors.

Fig. ,. Interferogram of Izu Torishima, generated
from RADARSAT-+ data pair (acquired on,**,/*2/,1 and ,**,/*3/,*).

 +* m 

Fig. .. Corrected interferogram of Izu Torishima(generated from the same pair as Fig. ,). We
adjusted the orbital parameters to make thephase around the entire island ﬂatten.

< Fig. ,  45=>01?@!A

B

CDE Fig. - F:G:01 HI Fig. - JK
   !"Fig. -. Coherence map with +,P+, window size.
The average coherence is *..-.

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Table +.

Description of DInSAR source.

Table ,.

65

Position and velocity errors of RADARSAT-+.

Table -. Rotation measurement and drift errors of
RADARSAT-+.

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Fig. /. Pseudo color image of Izu Torishima, observed on Aug.+*, ,**- (+/ : */ῌ+/ : +/ JST).

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67

Fig. 0. Brightness temperature image of Izu Torishima, observed with band 2 (2.**ῌ++.** mm).
A white rectangle indicates the area shown in
Fig. 1.

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89:;ῌ ῑ ῐ ῍Amelung, F. and Day, S. (,**,) InSAR observations of the+33/ Fogo, Cape Verde, eruption : Implications for thee#ects of collapse events upon island volcanoes. Geophys.
Res. Lett., ,3, doi : +*.+*,3/,**+GL*+-10*.
Amelung, F., Jónsson, S., Zebker, H. and Segall, P. (,***)
Widespread uplift and ‘trapdoor’ faulting on Galápagos
volcanoes observed with radar interferometry. Nature,.*1, 33-ῌ330.
Berk, A. , Bernstein, L. S. and Robertson, D. C. (+323)
MODTRAN : A Moderate Resolution Model for LOWTRAN 1, Air Force Geophysics Laboratory Technical
Report, GL-TR-23-*+,,, Hanscom AFB, MA.
Bridges, D. L. and Gao, S. (,**0) Spatial variation ofseismic b-values beneath Makushin Volcano, Unalaska
Island, Alaska. Earth Planet. Sci. Lett., ,./, .*2ῌ.+/.
Fernández, J., Yu, T. -T., Rodrı́guez-Velasco, G., GonzálezMatesanz, J., Romero, R., Rodrı́guez, G., Quirós, R.,
Dalda, A., Aparicio, A. and Blanco, M. J. (,**-) New
geodetic monitoring system in volcanic island of
Tenerife, Canarias, Spain. Combination of InSAR and
GPS techniques. J. Volcanol. Geotherm. Res., +,., ,.+ῌ,/-.
Houlié, N., Briole, P., Nercessian, A. and Murakami, M.
(,**/) Sounding the plume of the +2 August ,*** eruption of Miyakejima volcano (Japan) using GPS, Geophys.
Res. Lett., -,, doi : +*. +*,3/,**.GL*,+1,2.
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Ohkura, H. (+332) Applications of SAR data to monitoring
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Window. Remote Sens. Environ, .,, 2-ῌ+*0.
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