Estimation of Miyakejima volcanic gas hazards using vegetation index images

[ABSTRACT] The eruptive activity of Miyakejima volcano started on 8 July 2000, and the ejection of enormous amounts of sulphur dioxide (S02) has been continued since August 2000. The Tokyo Metropolitan Government started monitoring volcanic gas concentrations at the foot of the volcano from the end of 2000. We studied the seasonal and regional characteristics of high concentrations of S02 using the data.In order to estimate the volcanic gas hazards for the whole Miyakejima, a hazard mapping method using the Normalized Difference Vegetation Index (NDVI) images is proposed.