Earth Planets Space, Vol. 59 (No. 3), pp. 177-181, 2007
Akihiko Yokoo and Kazuhiro Ishihara
Sakurajima Volcano Research Center, Disaster Prevention Research Institute, Kyoto University, 1722-19 Sakurajima-Yokoyamacho, Kagoshima 891-1419, Japan
(Received June 24, 2006; Revised November 14, 2006; Accepted November 16, 2006; Online published March 23, 2007)
Four eruption movies of Sakurajima volcano taken in the 1980s are analyzed. Pressure waves associated with these eruptions are identified by changes in luminance using a new image processing method. Results of the processing determined the apparent speeds of these waves at approximately 342-574 m/s. Further, spatial characteristics of the pressure waves are quantitatively investigated to estimate the source conditions of volcanic explosions.
Key words: Sakurajima volcano, image processing, visualized pressure waves.