Abstract
Abstract 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.
Highlights
Strong atmospheric pressure perturbation is known to be generated by an explosive volcanic eruption and propagates as sound and infrasound waves
Image processing follows the method of Yokoo and Taniguchi (2004) in which the luminance data of the image is calculated by the following equation: c The Society of Geomagnetism and Earth, Planetary and Space SciCopyright ences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences; TERRAPUB
Image processing in the present study revealed a similar duration for the first dark portion of about 0.4
Summary
Strong atmospheric pressure perturbation is known to be generated by an explosive volcanic eruption and propagates as sound and infrasound waves. Yokoo and Taniguchi (2004) recently developed a method to detect pressure waves from eruption movies using image processing. ISHIHARA: ANALYSIS OF PRESSURE WAVES OBSERVED IN SAKURAJIMA ERUPTION MOVIES
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