Abstract
A 40-year-long record of the sulfur dioxide (SO2) emission rate of Asama volcano, Japan, is presented including high-temporal-resolution data since the 2004 eruption. The 2004 and 2008–2009 eruptive activities were associated with high SO2 emission, and SO2 emission rates markedly fluctuated. In contrast, stable and weak SO2 emissions have been observed for the rest of the investigated interval. The fluctuation of the SO2 emission rates is correlated with the number of shallow low-frequency B-type earthquakes, implying that increased flows of gas and/or magma induced the B-type earthquakes along the shallow conduit. The total volumes of outgassed magma during the 2004 and 2008–2009 eruptive activities are estimated to be 1.9 × 108 and 1.5 × 108 m3, respectively. These volumes are about 100–200 times larger than those of the erupted magma, indicating that the large volumes of the magma were outgassed without being erupted (i.e., excess degassing/outgassing). Degassing and outgassing driven by magma convection rather than by permeable gas flow in the conduit is concluded as the probable degassing/outgassing process of Asama volcano based on model examinations, and is thought to occur regardless of the outgassing intensity. Production rates of outgassed magma related to the 2004 and 2008–2009 eruptive periods are estimated to have been 7.4 × 103 and 6.7 × 103 kg/s, respectively. These values are one order of magnitude higher than the average production rate of 0.92 × 103 kg/s for the inactive periods. Increased supply of fresh magma is thought to activate magma convection in the conduit and to thereby increase magma degassing/outgassing.
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Acknowledgments
We appreciate Tomoaki Shuto and Hiroaki Kagesawa of the University of Tokyo for their help with fieldwork. The Japan Meteorological Agency kindly allowed us to use their seismic data for Asama volcano. We are also grateful for helpful comments from Dr. Hiroshi Shinohara of the Geological Survey of Japan, AIST. We sincerely thank Associate Editor Dr. Paul J. Wallace, Dr. Marie Edmonds, and Dr. Alessandro Aiuppa for their constructive suggestions and critical comments on this study and for reviewing, and Executive Editor Dr. James. D.L. White for the careful editing of this manuscript.
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Ohwada, M., Kazahaya, K., Mori, T. et al. Sulfur dioxide emissions related to volcanic activity at Asama volcano, Japan. Bull Volcanol 75, 775 (2013). https://doi.org/10.1007/s00445-013-0775-5
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DOI: https://doi.org/10.1007/s00445-013-0775-5