Journal
GEOTHERMICS
Volume 42, Issue -, Pages 56-64Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.geothermics.2012.01.003
Keywords
Aso volcano; Hydrothermal eruption; Steam-dominated system; Yoshioka hot spring; Heat discharge rate
Categories
Funding
- Kyoto University [KAGI21]
- Grants-in-Aid for Scientific Research [22710171] Funding Source: KAKEN
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Since June of 2006, vigorous new fumaroles, accompanied by hydrothermal eruptions, have formed at the Yoshioka hot spring of Aso volcano in Japan. Prior to this date, the hot spring was a minor thermal area, emitting only 0.2 x 10(6) J/s of hot water. The steam flux increased significantly to 15-30 x 10(6) J/s in October 2006. After November 2006, the new fumaroles have maintained a largely constant heat discharge rate of approximately 4.6 x 10(6) J/s (170 tonne/day), which is almost 20 times higher than that of the previous natural thermal activity. Mudslides, earthquakes, and human-related factors did not cause the geothermal events observed at Yoshioka. On the basis of energy estimations, we infer that the hydrothermal eruptions and increased flow have resulted from an increase in the volcanic fluid flux from a deep aquifer to the steam-dominated reservoir beneath Yoshioka. (C) 2012 Elsevier Ltd. All rights reserved.
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