2001 Volume 52 Issue 4-5 Pages 189-197
Volcanic ash fall areas associated with Usu 2000 eruption can be detected as black stripes, including areas that could not be traced from field survey. The areas that have reflectance less than 0.6 derived from ASTER band 3 are corresponding to the ash fall areas over 8 g/m2. Visible to shortwave infrared reflectance of the volcanic ash have been measured under controlled moisture contents. It is possible to estimate the amount of volcanic ash deposits using the Volcanic Ash Reflectance Model based on the reflectance measurements of the volcanic ash.