- Open Access
Precise remote-monitoring technique of water volume and temperature of a crater lake in Aso volcano, Japan: implications for a sensitive window of a volcanic hydrothermal system
Earth, Planets and Spacevolume 60, pages705–710 (2008)
A high-resolution Digital Surface Model and a commercial digital camera have enabled precise and continuous monitoring of the crater lake at Aso volcano. From July 2006 onwards, infrared (IR) thermometry has been used with this system, enabling more accurate measurements of lake volume and temperature based on simple and intensive observations than has been possible in any other previous studies. The heat discharge remained largely constant at approximately 220 MW, with the exception of an abrupt increase to 280 MW that coincided with a rapid decrease in the water level in August 2007. Simultaneously, an increase in temperature at a shallow depth was suggested by other observations. The crater lake was found to respond to even slight changes in volcanic fluid supply, which can be well quantified by our method. Thus, a crater lake can be monitored more precisely than subaerial fumaroles whose energy estimation is often accompanied by large uncertainties. Our monitoring technique of a crater lake provides information on the subsurface hydrothermal system beneath it, for which any in-situ measurements are practically impossible.
Brown, H., H. Rymer, J. Dowden, P. Kapadia, D. Stevenson, J. Barquero, and L. D. Morales, Energy budget analysis for Poas crater lake: implication for predicting volcanic activity, Nature, 339, 370–373, 1989.
Hurst, A. W., H. M. Bibby, B. J. Scott, and M. J. J. McGuinness, The heat source of Ruapehu crater lake; deductions from the energy and mass balances, J. Volcanol. Geotherm. Res., 46, 1–20, 1991.
Kagiyama, T., Evaluation methods of heat discharge and their applications to the major active volcanoes in Japan, J. Volcanol. Geotherm. Res., 9, 87–97, 1981.
Kanda, W., Y. Tanaka, M. Utsugi, S. Takakura, T. Hashimoto, and H. Inoue, A preparation zone for volcanic explosions beneath Naka-dake crater, Aso volcano as inferred from electrical resistivity surveys, J. Volcanol. Geotherm. Res., (in press).
Ohba, T., J. Hirabayashi, and K. Nogami, Water, heat and chloride budgets of the crater lake Yugama at Kusatsu-Shirane Volcano, Japan, Geochem. J., 28, 217–231, 1994.
Ohsawa, S., Y. Sudo, H. Mawatari, G. Shimoda, M. Utsugi, K. Amita, S. Yoshikawa, M. Yamada, K. Iwakura, and Y. Onda, Some geochemical features of Yudamari Crater Lake, Aso volcano, Japan, Geotherm. Res. Rep. Kyusyu Univ., 12, 62–65, 2003 (in Japanese with English abstract).
Oppenheimer, C., Ramifications of the skin effect for crater lake heat budget analysis, J. Volcanol. Geotherm. Res., 75, 159–165, 1997.
Oppenheimer, C. and A. J. S. McGonigle, Exploiting ground-based optical sensing technologies for volcanic gas surveillance, Ann. Geophys., 47, 1455–1470, 2004.
Rowe, G. L., S. L. Brantley, M. Fernandez, J. F. Fernandez, A. Borgia, and J. Barquero, Fluid-volcano interaction in an active stratovolcano; the crater lake system of Poas Volcano, Costa Rica, J. Volcanol. Geotherm. Res., 49, 23–51, 1992.
Ryan, P. J., D. R. Harleman, and K. D. Stolzenb, Surface heat loss from cooling ponds, Water Resour. Res., 10, 930–938, 1974.
Tanaka, Y., Eruption mechanism as inferred from geomagnetic changes with special attention to the 1989–1990 activity of Aso Volcano, J. Volcanol. Geotherm. Res., 56, 319–338, 1993.
Vandemeulebrouck, J., D. Stemmelen, T. Hurst, and J. Grangeon, Analogue modeling of instabilities in crater lake hydrothermal systems, J. Geophys. Res., 110, doi:10.1029/2003JB002794, 2005.
Wehr, A. and U. Lohr, Airbone laser scanning—an introduction and overview, ISPRS J. Photogrammetry Remote Sensing, 54, 68–82, 1999.
Yamamoto, M., H. Kawakatsu, S. Kaneshima, T. Mori, T. Tsutsui, Y. Sudo, and Y. Morita, Detection of a crack-like conduit beneath the active crater at Aso Volcano, Japan, Geophys. Res. Lett., 26, 3677–3680, 1999.