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Characteristics of isolated hybrid tremor (HBT) during a calm activity period at Aso Volcano

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Abstract

Isolated-type tremors having two events with different dominant frequencies are characteristic seismological phenomena observed during the fumarolic activity stage at Aso Volcano. These isolated tremors are called hybrid tremors (HBT) and comprise two parts: an initial part named the “HF-part” with a dominant frequency in the high-frequency region (approximately 10 Hz) and the following part named the “LF-part” with a dominant frequency in the low-frequency region (approximately 2 Hz). The LF-part is observed after the HF-part, and the HBT is accompanied by a long-period tremor (LPT). Hypocenters and source parameters are estimated using seismograms recorded at 64 stations around Nakadake crater. The amplitude distributions of all HF-parts have almost similar trends. Similarly, the amplitude distributions of all LF-parts have almost similar trends. However, the amplitude distributions of HF- and LF-parts are not similar. From these results, we proposed that the hypocenters and source parameters of HF- and LF-parts are not common, but each of them have common hypocenters and source parameters. The hypocenter region of HF-parts was estimated to be just beneath the fumarole region south of the 1st crater: the volume fluctuation is the major source factor. The hypocenter region of LF-parts is estimated to be at a depth of approximately 300 m beneath the first crater: the strike–slip component is the major source parameter. The hypocentral depth of LF-parts is located at the upper end of the crack estimated to be the source of the LPTs. The LPTs and HBTs are observed almost simultaneously. We consider that volcanic fluid is involved in the source mechanisms of both HBT and LPT.

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Acknowledgements

We are grateful to the staff members of the Aso Volcanological Laboratory, Kyoto University. We also thank Drs. J. Hirabayashi and K. Nogami of the Volcanic Fluid Research Center, Tokyo Institute of Technology, for their support. The authors are indebted to the thoughtful and helpful comments from Dr. A. W. Hurst of GNS, New Zealand; Drs. K. Ishihara and M. Iguchi, Sakurajima Volcano Research Center, Kyoto University; and Dr. H. Shinohara, Geological Survey of Japan, AIST. We would like to thank Dr. E. Marchetti, Dr. M. Ripepe, and two anonymous reviewers for their constructive comments. The data used in this study were obtained from the National Project for Prediction of Volcanic Eruptions (Project ASO98). We also thank all the members of Project ASO98.

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Authors and Affiliations

  1. Geological Survey of Japan, National Institute of Advanced Industrial Science and Technology, 1-1-1 Higashi, Tsukuba, Ibaraki, Japan

    Takehiko Mori

  2. The Foundation of Aso Volcano Museum, 1930-1 Akamizu, Aso, Kumamoto, Japan

    Yasuaki Sudo

  3. Faculty of Engineering and Resource Science, Akita University, 1-1 Tegatagakuen, Akita, Akita, Japan

    Tomoki Tsutsui

  4. Aso Volcanological Laboratory, Graduate School of Science, Kyoto University, 5280 Kawayô, Minamiaso, Kumamoto, Japan

    Shin Yoshikawa

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  1. Takehiko Mori
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  2. Yasuaki Sudo
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  3. Tomoki Tsutsui
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  4. Shin Yoshikawa
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Correspondence to Takehiko Mori.

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Editorial responsibility: M Ripepe

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Mori, T., Sudo, Y., Tsutsui, T. et al. Characteristics of isolated hybrid tremor (HBT) during a calm activity period at Aso Volcano. Bull Volcanol 70, 1031–1042 (2008). https://doi.org/10.1007/s00445-007-0185-7

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