二酸化硫黄放出率の自動計測化へ向けた実証実験 --火山ガス拡散モデルからの二酸化硫黄放出率推定の試み--

Abstract

Japan Meteorological Agency has repeated the observation of the SO2 emission rate which can estimate the rise and fall of a magma activity in the active volcano in order to use for evaluation of volcanic activity. The SO2 emission rate observation performed by a high frequency is required in order to find out change of the SO2 emission rate which occurs in the short term. At present, we are developing the automatic-measurement system using a modelling of the volcanic gas diffusion. This manuscript indicates that it is possible to obtain a SO2 emission rate by column concentration of some observed samples by using the model of the volcanic gas diffusion. We could judge change of SO2 emission rate which makes the abnormalities of volcanic activity a cause in a short time because the SO2 emission rate could be estimated from the maximum column concentration and wind velocity using this model. In future research, the model of a volcanic gas diffusion will be improved to the new model reflecting local weather condition and will improve the accuracy of SO2 emission rate.