<title>Sulfur dioxide flux estimation at Oyama volcano in Miyake-Jima, Japan, using advanced spaceborne thermal emission and reflection radiometer (ASTER)</title>

Abstract

The author proposes a method to estimate two dimensional spatial distribution of volcanic SO<SUB>2</SUB> using a multispectral scanner in thermal infrared region. Volcanic SO<SUB>2</SUB> flux can be estimated from the spatial distribution of SO<SUB>2</SUB> and the plume flow velocity. As ASETR has both Thermal Infrared Radiometer (TIR) and nadir-backward stereoscopic viewing function, we can estimate volcanic SO<SUB>2</SUB> flux by ASTER data alone. These methods are applied to the Oyama volcano in Miyakejima, Japan. SO<SUB>2</SUB> flux derived from ASTER is 3 - X 104<SUP>4</SUP>, which is slightly larger than one derived from COSPEC.