2014 Volume 123 Issue 5 Pages 776-788
The methods, results, and prospects of image recording of volcanic clouds are discussed by considering two volcanoes in the Philippines, Mayon and Bulusan. At Mayon volcano, video and network cameras are utilized for automatic time-interval long-term recordings. Near-infrared and night-shot modes in addition to the conventional visible mode are adopted there. Since the inception of recording in June 2003, the daily activity of the volcano was the almost continuous ejection of white vaporous plumes. Explosive eruptions with lava ejections that occurred in July–August 2006 and December 2009 were recorded during both daytime and nighttime. Near-infrared and night-shot modes were very effective for observing flows and falls of hot lava and also the foreboding indication of hot lava glow at the summit crater some months earlier at nighttime. At Bulusan volcano, video recording using a digital high-vision video camera with smooth interval mode began in November 2010. Records of explosive eruptions in late 2010 were obtained during daytime at a fixed point located 23 km from the crater.