Measurements of mass flow of SO
2 at Asama Volcano were carried out by means of a Barringer correlation spectrometer on April 28, 1974, one year after the eruptive activity. The spectrometer was carried on the Jeep and the scanning was made with its telescope directed vertically along the drive way which runs eastward of the volcano. The wind velocity at the relevant altitude was measured with pilot ballons. Several runs of measurement syielded the total emission of SO
2 from the summit crater as 780 tons/day. Comparing with the previous value (142 tons/day) in June, 1972, SO
2 emission increased remarkably probably as the consequence of the recent eruptive activity. Global discharge of SO
2 to the atmosphere is evaluated as 3×10
7 tons per year. From the volcanological point of view, one of the essential problem is to estimate the bulk discharge of H
2O from the individual volcano. If we carry out the similar observation at a volcano where the mole ratio of H
2O/SO
2 is known, we can evaluate the total emission of H
2O and consequently the thermal energy transported by H
2O from a volcano may be estimated.
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