Abstract
On September 1, 2004, Mt. Asama in central Japan erupted for the first time in 21 years. Between this moderate eruption and mid-November of the same year, 4 additional moderate eruptions occurred. We installed 8 broadband seismic stations in addition to the short period seismic network around the volcano and succeeded in recording the near-field seismic signals associated with the summit eruptions. The results of the waveform inversions clearly show that the force system exerted at the source region is dominated by vertical single force components. The source depths of the single force are shallower than 200 m from the bottom of the summit crater, and the order of magnitude of the single force is 1010–1011N. The source time history of each vertical single force component consists of two downward forces and one upward force. The initial downward force probably corresponds to the sudden removal of a lid capping the pressurized conduit. The drag force due to viscous magma moving upward in the conduit can explain the upward force. The correlation between the single force amplitudes and the amounts of volcanic deposits emitted from the summit crater are not necessarily positive, suggesting that the amount of deposits remaining within the summit crater may have played an important role in the excitation of the single force.
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References
Akaike, H., A new look at the statistical model identification, IEEE Trans. Autom. Contol, AC-9, 716–723, 1974.
Aki, K. and P. G. Richards, Quantitative Seismology, Theory and Method vol. I, 557 pp., Freeman, New York, 1980.
Aoki, Y., H. Watanabe, E. Koyama, J. Oikawa, and Y. Morita, Ground deformation associated with the 2004–2005 unrest of Asama Volcano, Japan, Bull. Volcanol. Soc. Japan, 50, 575–584, 2005 (in Japanese with English abstract).
Aramaki, S., Geology of Asama Volcano, J. Fac. Sci. Univ. Tokyo, 14, 229–443, 1963.
Blackstock, D. T., Fundamentals of Physical Acoustics, 541 pp., Wiley-Interscience, New-York, 2000.
Chouet, B. A., P. Dawson, T. Ohminato, M. Martini, G. Saccorotti, F. Giudicepietro, G. De Luca, G. Milana, and R. Scarpa, Source mechanisms of explosions at Stromboli Volcano, Italy, determined from moment-tensor inversions of very-long-period data, J. Geophys. Res., 108, doi:10.1029/2002JB001919, 2003.
Chouet, B., P. Dawson, and A. Arciniega, Source mechanism of vulcanian degassing at Popocatépetl Volcano, Mexico, determined from waveform inversion of very long period signals, J. Geophys. Res., 110, doi:10.1029/2004JB003524, 2005.
Dobran, F., Volcanic Processes Mechanisms in Material Transport, 590 pp., Kluwer Academic, 2001.
Ekström, G., M. Nettles, and G. A. Abers, Glacial earthquakes, Science, 302, 622–624, doi:10.1126/science.1088057, 2003.
Japan Meteorological Agency, Eruptions of Asamayama volcano in September 2004, Abst. Volcanol. Soc. Japan 2004 Fall Meeting, 181, 2004 (in Japanese).
Fujiwara, Y., T. Sakai, K. Kato, M. Nakamura, H. Naito, H. Yamasato, M. Churei, H. Hiramatsu, Y. Ueda, and S. Iijima, Mt. Asama eruption on 1st September 2004: Air-shock waveforms observed all over Japan, Abst. Volcanol. Soc. Jap. 2004 Fall Meeting, 202, 2004 (in Japanese).
Kanamori, H. and J. W. Given, Analysis of seismic body waves excited by the May 18, 1980, eruption of Mount St. Helens—a terrestrial monopole?, J. Geophys. Res., 87, 5422–5432, 1982.
Kanamori, H., J. Given, and T. Lay, Analysis of seismic body waves excited by the Mount St. Helens eruption of May 18, 1980, J. Geophys. Res., 89, 1856–1866, 1984.
Kawakatsu, H., Centroid single force inversion of seismic waves generated by landslides, J. Geophys. Res., 94, 12363–12374, 1989.
McNutt, S. R., Volcanic tremor amplitude correlated with volcano explosivity and its potential use in determining ash hazards to aviation, USGS Bull., 2047, 377–385, 1994.
Minakami, T., Seismology of volcanoes in Japan, in Physical Volcanology Developments in Solid Earth Geophysics vol 6, edited by Civetta et al., 333 pp., Elsevier, Amsterdam, 1–27, 1974.
Murakami, M., Magma migration preceding 2004 eruption of Asama Volcano detected by GPS, Abst. Volcanol. Soc. Jap. 2004 Fall Meeting, 204, 2004 (in Japanese).
Murase, T. and A. R. McBirney, Properties of some common igneous rocks and their melts at high temperatures, Geol. Soc. Am. Bull., 84, 3563–3592, 1973.
Newhall, C. G. and S. Self, The volcanic explosivity index (VEI): An estimate of explosive magnitude for historical volcanism, J. Geophys. Res., 87, 1231–1238, 1982.
Nishimura, T., Source mechanisms of volcanic explosion earthquakes: single force and implosive sources, J. Volcanol. Geotherm. Res., 86, 97–106, 1998.
Nishimura, T. and H. Uchida, Application of single force model to the volcanic explosion earthquakes observed at Asama Volcano in 2004, Bull. Volcanol. Soc. Japan, 50, 387–391, 2005 (in Japanese with English abstract).
Nishimura, T., H. Hamaguchi, and S. Ueki, Source mechanisms of volcanic tremor and low-frequency earthquakes associated with the 1988–1989 eruptive activity of Mt. Tokachi, Hokkaido, Japan, Geophys. J. Int., 121, 444–458, 1995.
Ohminato, T. and B. Chouet, A free-surface boundary condition for including 3D topography in the finite difference method, Bull. Seismol. Soc. Am., 87, 494–515, 1997.
Ohminato, T., B. Chouet, P. Dawson, and S. Kedar, Waveform inversion of very-long-period impulsive signals associated with magmatic injection beneath Kilauea volcano, Hawaii, J. Geophys. Res., 103, 23839–23862, 1998.
Oki, S., M. Murakami, N. Watanabe, B. Urabe, and M. Miyawaki, Topographic change of the summit crater of the Asama volcano during 2004 eruption derived from repeated airborne Synthetic Aperture Radar (SAR) measurements, Bull. Volcanol. Soc. Japan, 50, 401–410, 2005 (in Japanese with English abstract).
Ripepe, M., S. Ciliberto, and M. D. Schiava, Time constraints for modeling source dynamics of volcanic explosions at Stromboli, J. Geophys. Res., 106, 8713–8727, 2001.
Rutherford, M. J. and J. E. Gardner, Rates of magma ascent, in Encyclopedia of Volcanoes, edited by Sigrudsson et al., 1417 pp., Academic Press, San Diego, 207–217, 2000.
Takei, Y. and M. Kumazawa, Why have the single force and torque been excluded from seismic source models?, Geophys. J. Int., 118, 20–30, 1994.
Takeo, M., H. Yamasato, I. Furuya, and M. Seino, Analysis of long-period seismic waves excited by the November 1987 eruption of Izu-Oshima volcano, J. Geophys. Res., 95, 19377–19393, 1990.
Tameguri, T., M. Iguchi, and K. Ishihara, Mechanism of explosive eruptions from moment tensor analyses of explosion earthquakes at Sakurajima Volcano, Japan, Bull. Volcanol. Soc. Japan, 47, 197–215, 2002.
Turcotte, D. L. and G. Schubert, Geodynamics Second Edition, 456 pp., Cambridge University Press, Cambridge, 2001.
Turcotte, D. L., H. Ockendon, J. R. Ockendon, and S. J. Cowley, A mathematical model of vulcanian eruptions, Geophys. J. Int., 103, 211–217, 1990.
Uhira, K. and M. Takeo, The source of explosive eruption of Sakurajima volcano, Japan, J. Geophys. Res., 99, 17775–17789, 1994.
Yamamoto, M., M. Takeo, T. Ohminato, J. Oikawa, Y. Aoki, H. Ueda, S. Nakamura, H. Tsuji, E. Koyama, N. Osada, and T. Urabe, A unique earthquake activity preceding the eruption at Asama volcano in 2004, Bull. Volcanol. Soc. Japan, 50, 393–400, 2005 (in Japanese with English abstract).
Yoshimoto, M., T. Shimano, S. Nakada, E. Koyama, H. Tsuji, A. Iida, M. Kurokawa, Y. Okayama, M. Nonaka, T. Kaneko, H. Hoshizumi, Y. Ishizuka, R. Furukawa, K. Nogami, S. Onizawa, K. Niihori, T. Sugimoto, and M. Nagai, Mass estimation and characteristics of ejecta from the 2004 eruptions of Asama volcano, Bull. Volcanol. Soc. Japan, 50, 519–533, 2005 (in Japanese with English abstract).
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Ohminato, T., Takeo, M., Kumagai, H. et al. Vulcanian eruptions with dominant single force components observed during the Asama 2004 volcanic activity in Japan. Earth Planet Sp 58, 583–593 (2006). https://doi.org/10.1186/BF03351955
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DOI: https://doi.org/10.1186/BF03351955