Earth, Planets and Space

, Volume 60, Issue 2, pp 133–138 | Cite as

Numerical simulation of the tsunami generated by the 2007 Noto Hanto Earthquake and implications for unusual tidal surges observed in Toyama Bay

  • Ikuo Abe
  • Kazuhisa Goto
  • Fumihiko Imamura
  • Katsuyoshi Shimizu
Open Access
Letter

Abstract

We conducted a numerical analysis of the tsunami generated by the 2007 Noto Hanto Earthquake (Mj = 6.9) that occurred on 25 March 2007 near the Noto Peninsula on the northwest coast of Honshu Island, Japan. Our numerical simulation reproduced well the behaviors of the tsunami as recorded at the Wajima tidal observatory and showed that the computed tsunami arrived in Toyama Bay more than 1 h after the earthquake. However, a crew of a small boat in the bay felt the shock and, despite calm weather conditions, their boat capsized just 3 min after the earthquake. Although abnormal tidal surges were recorded at several locations around Toyama Bay, the timing of these is inconsistent with the surges being a direct result of the tsunami generated at the source area of the earthquake. We used “backward wave propagation analysis” to estimate the likely source area of the abnormal tidal surges in the bay and carried out the a simulation of landslide-induced tsunami. Our conclusion is that these abnormal tidal surges were likely caused by a submarine landslide on the steep sea floor on the western side of Toyama Bay.

Key words

The 2007 Noto Hanto Earthquake tsunami Toyama Bay abnormal wave 

References

  1. Asahi Newspaper, Damages due to the 2007 Noto Hanto Earthquake at Toyama and Niigata prefectures, http://www.asahi.com/special/070325/TKY200703250271.html, 2007 (in Japanese).
  2. Geographical Survey Institute, Diastrophism due to the 2007 Noto Hanto Earthquake, http://www.gsi.go.jp/WNEW/PRESS-RELEASE/2007/0328/05.pdf, 2007 (in Japanese).
  3. Imai, N., S. Terashima, H. Katayama, T. Nakajima, K. Ikehara, and M. Taniguchi, Geochemical behavior of heavy metals in coastal marine sediments from the eastern margin of the Japan Sea, Bull. Geol. Surv. Jpn., 48, 511–529, 1997 (in Japanese with English abstract).Google Scholar
  4. Imamura, F., Review of tsunami simulation with a finite difference method, in Long-Wave Runup Models, edited by H. Yeh, P. Liu, and C. Synolakis, pp. 25–42, World Scientific Publishing Co., 1995.Google Scholar
  5. Imamura, F. and M. M. A. Imteaz, Long waves in two-layers, Governing equations and numerical model, Sci. Tsunami Haz., 13(1), 3–24, 1995.Google Scholar
  6. JMA (Japan Meteorological Agency), Statistical information of past weather data, http://www.jma.go.jp, 2007 (in Japanese).Google Scholar
  7. Manshiha, L. and D. E. Smylie, The Displacement Fields of Inclined Faults, Bull. Seismol. Soc. Am., 61, 1433–1440, 1971.Google Scholar
  8. Matsui, T., F. Imamura, E. Tajika, Y. Nakano, and Y. Fujisawa, Generation and propagation of a tsunami from the Cretaceous/Tertiary impact event, in Catastrophic Events and Mass Extinctions: Impact and Beyond, C. Koeberl and G. Macleod (Eds), Geol. Soc. Am. Special Paper, 356, 69–77, 2002.Google Scholar
  9. Nakajima, K., Hyperpycnites deposited 700 km away from river mouths in the central Japan Sea, J. Sediment. Res., 76, 60–73, DOI: 10.2110/jsr.2006.13, 2006.CrossRefGoogle Scholar
  10. Nakajima, K., M. Satoh, and Y. Okamura, Channel-levee complexes, terminal deep-sea fan and sediment wave fields associated with the Toyama Deep-Sea Channel system in the Japan Sea, Mar. Geol., 147, 25–41, 1998.CrossRefGoogle Scholar
  11. Okamoto, K. and M. Sakuta, Numerical Simulation Technique for Time-History Pressure of Floating Structure in Seaquakes, Proceedings of Ocean Cites, 308–311, 1995.Google Scholar
  12. Prime Minister of Japan and His Cabinet, Details of the 2007 Noto Hanto Earthquake, http://www.kantei.go.jp/jp/kikikanri/jisin/isikawa/isikawa1530.html, 2007 (in Japanese).

Copyright information

© The Society of Geomagnetism and Earth, Planetary and Space Sciences (SGEPSS); The Seismological Society of Japan; The Volcanological Society of Japan; The Geodetic Society of Japan; The Japanese Society for Planetary Sciences. 2008

Authors and Affiliations

  • Ikuo Abe
    • 1
  • Kazuhisa Goto
    • 1
  • Fumihiko Imamura
    • 1
  • Katsuyoshi Shimizu
    • 2
  1. 1.Disaster Control Research Center, Graduate School of EngineeringTohoku UniversitySendaiJapan
  2. 2.Marine Information DivisionPort and Airport Research InstituteYokosukaJapan

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