Abstract
A study was made on the detectability of volcanic ash covered area using two Landsat MSS imageries taken on Oct. 23 and Nov. 1 1979, 5 days before and 3 days after the eruption of Mt. Ontake which had been dormant for more than 20 thousand years. Due to the fact that the data were taken mid autumn, color change of leaves took place which gave a similar effect as ash cover in spectral response to MSS. The aereal extension of effect of plume of water vapor was larger than its appearance in shorter spectral region of MSS data. It was found that the most effective method of detecting ash covered vegetated area was to use the difference of the normalized values of band 4(0.5–0.6 μm) and band 7(0.8–1.1 μm) of Landsat MSS data. Through the method developed by the present authors the area covered with volcanic ash of more than 1 mm thickness can be successfully detected.
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