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Webcam Surveillance System of Asama Volcano
Yoshinori MAEJIMA, Yukio HAYAKAWA, Chihiro TANAKA and Yoshihiko MURAI+, 4 rF$ - 4#yabzGH+5IJK$ . 4+

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Citizen of Karuizawa, Nagano Japan.
Corresponding author : Yoshinori Maejima
e-mail : maejima@maechan.net

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Table +.

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List of webcams watching Asama Volcano.

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Fig. +. Location map of the webcam system around
Asama Volcano. Solid circles are our own cameras. Open circles are cameras placed by others
and included in our archive system.

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Fig. ,. An example of a webpage. Images of all cameras are archived in our system and the latest image is displayedon the webpage at ten minutes intervals. The page shows +.. images in total. Each image can be enlarged byclicking.
http : //bousai.maechan.net/volcano/asama/
Fig. -. Live images of +, webcams, displayed at the top of an Internet bulletin board.
http : //vulcania.jp/bbs/Fig. /. The ﬂight distance of ballistic ejecta, erupted from Asama at ,* : /3 on +. November ,**., is determined bywebcam image. The procedure is as follows :(a) Superimpose a daytime image onto the ,+ : */ night image of wildﬁres caused by the explosion.
(b) Create an image viewed from the camera site using a -D map navigator, Kashimir -D. Contours are emphasized.
(c) Superimposing (a) onto (b), the elevation of wildﬁres is determined between +2/*ῌ,+/* m.
(d) On a topographic map, an intersection point is found between the +2/* m contour and the straight line drawn
form the skyline to the camera direction. It is +.2 km from source.
Fig. 0.

The red glow is ranked according to its intensity.

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