During the following "quiet" period in October, the hydrothermal component of the vapor discharge steadily increased. The gases were super-saturated with elemental sulfur; their thermodynamic equilibration temperatures ranged from 200 to 600° Celsius. Gases and water from fumaroles and thermal springs on the flanks of the volcano are likely to be produced from a two-phase vapor-brine envelope within the volcano. Production of such gas over extended periods may account for the large amount of sulfur dioxide being released from the volcano in relation to the small amount of ejected solids.