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Precise hypocenter locations of midcrustal low-frequency earthquakes beneath Mt. Fuji, Japan

Earth, Planets and Space volume 56, pages e37–e40 (2004)Cite this article

Abstract

Midcrustal low-frequency earthquakes (MLFs) have been observed at seismic stations around Mt. Fuji, Japan. In September–December 2000 and April–May 2001, abnormally high numbers of MLFs occurred. We located hypocenters for the 80 MLFs during 1998–2003 by using the hypoDD earthquake location program (Waldhauser and Ellsworth, 2000). The MLF hypocenters define an ellipsoidal volume some 5 km in diameter ranging from 11 to 16 km in focal depth. This volume is centered 3 km northeast of the summit and its long axis is directed NW-SE. The direction of the axis coincides with the major axis of tectonic compression around Mt. Fuji. The center of the MLF epicenters gradually migrated upward and 2–3 km from southeast to northwest during 1998–2001. We interpret that the hypocentral migration of MLFs reflects magma movement associated with a NW-SE oriented dike beneath Mt. Fuji.

References

  • Aizawa, K., R. Yoshimura, and N. Oshiman, Splitting of the Philippine Sea Plate and a magma chamber beneath Mt. Fuji, Geophys. Res. Lett., 31, L09603, doi:10.1029/2004GL019477, 2004.

    Google Scholar 

  • Fujii, T., Detecting the activity of Mt. Fuji, Kagaku, 71, 1595–1600, 2001 (in Japanese).

    Google Scholar 

  • Hasegawa, A., D. Zhao, S. Hori, A. Yamamoto, and S. Horiuchi, Deep structure of the northeastern Japan arc and its relationship to seismic and volcanic activity, Nature, 352, 683–689, 1991.

    Article  Google Scholar 

  • Hill, D. P., Earthquakes and carbon dioxide beneath Mammoth mountain, California, Seismol. Res. Lett., 67, 8–15, 1996.

    Article  Google Scholar 

  • Kanjo, K., I. Karakama, and R. S. Matsuura, Seismic activities of Mt. Fuji region detected by continuous observation of micro-earthquakes, J. Phys. Earth, 32, 463–468, 1984.

    Article  Google Scholar 

  • Knopoff, L. and M. J. Randall, The compensated linear-vector dipole: A possible mechanism for deep earthquakes, J. Geophys. Res., 75, 4957–4963, 1970.

    Article  Google Scholar 

  • Lees, J. M. and M. Ukawa, The south Fossa Magna, Japan, revealed by high-resolution P- and S-wave travel time tomography, Tectonophys., 207, 377–396, 1992.

    Article  Google Scholar 

  • Nakamichi, H., H. Hamaguchi, S. Tanaka, S. Ueki, T. Nishimura, and A. Hasegawa, Source mechanisms of deep and intermediate-depth low-frequency earthquakes beneath Iwate volcano, northeastern Japan, Geophys. J. Int., 154, 811–828, 2003.

    Article  Google Scholar 

  • Nakamura, K., Volcanoes as possible indicators of tectonic stress orientation—principle and proposal, J. Volcanol. Geotherm. Res., 2, 1–16, 1977.

    Article  Google Scholar 

  • Pitt, A. M. and D. P. Hill, Long-period earthquakes in the Long Valley Caldera region, eastern California, Geophys. Res. Lett., 21, 1679–1682, 1994.

    Article  Google Scholar 

  • Shimozuru, D., N. Osada, and T. Miyazaki, Seismic and tilt monitoring of Mount Fuji during the period from October 1982 to December 1984, Bull. Earthq. Res. Inst., 61, 587–613, 1986 (in Japanese with English abstract).

    Google Scholar 

  • Tsuya, H., Topography and geology of volcano Mt. Fuji, Results of the co-operative scientific survey of Mt. Fuji, Fuji Kyuko Co. Ltd., Tokyo, 1971 (in Japanese with English abstract).

    Google Scholar 

  • Ukawa, M., Collision and fan-shaped compressional stress pattern in the Izu block at the northern edge of the Philippine Sea plate, J. Geophys. Res., 96, 713–728, 1991.

    Article  Google Scholar 

  • Ukawa, M., Low-frequency earthquakes, forecasting and disaster mitigation of eruption of Mt. Fuji, Chikyu Monthly, 23, 784–790, 2001 (in Japanese).

    Google Scholar 

  • Ukawa, M, Activity of Fuji volcano, Reports on volcanic activities and volcanological studies in Japan for the period from 1999 to 2002, 18–22, 2003.

    Google Scholar 

  • Ukawa, M. and M. Ohtake, Peculiar microearthquake activity just beneath Mt. Fuji, Zisin, 37, 129–133, 1984 (in Japanese).

    Google Scholar 

  • Waldhauser, F. and W. L. Ellsworth, A double-difference earthquake location algorithm: Method and application to the northern Hayward fault, California, Bull. Seismol. Soc. Am., 90, 1353–1368, 2000.

    Article  Google Scholar 

  • White, R. A., Precursory deep long-period earthquakes at Mount Pinatubo: Spatio-temporal link to a basalt trigger, in Fire and Mud Eruptions and Lahars of Mount Pinatubo, Philippines, edited by C. G. Newhall and R. S. Punongbayan, Philippine Institute of Volcanology, 1996.

    Google Scholar 

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Author notes

  1. Haruhisa Nakamichi

    Present address: U. S. Geological Survey, 345 Middlefield Road, Mail Stop 910, Menlo Park, California, 94025-3591, USA

Authors and Affiliations

  1. National Research Institute for Earth Science and Disaster Prevention, 3-1 Tennodai, Tsukuba, 305-0006, Japan

    Haruhisa Nakamichi & Motoo Ukawa

  2. Earthquake Research Institute, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo, 113-0032, Japan

    Haruhisa Nakamichi & Shinichi Sakai

Authors
  1. Haruhisa Nakamichi
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  2. Motoo Ukawa
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  3. Shinichi Sakai
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Correspondence to Haruhisa Nakamichi.

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Nakamichi, H., Ukawa, M. & Sakai, S. Precise hypocenter locations of midcrustal low-frequency earthquakes beneath Mt. Fuji, Japan. Earth Planet Sp 56, e37–e40 (2004). https://doi.org/10.1186/BF03352542

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  • DOI: https://doi.org/10.1186/BF03352542

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