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Origin of the anomalously large upward acceleration associated with the 2008 Iwate-Miyagi Nairiku earthquake

  • Takabatake, Hideo (Department of Architecture, Kanazawa Institute of Technology, Institute of Disaster and Environmental Science) ;
  • Matsuoka, Motohiro (Department of Architecture, Kanazawa Institute of Technology, Institute of Disaster and Environmental Science)
  • Received : 2011.04.09
  • Accepted : 2012.01.17
  • Published : 2012.09.25

Abstract

The 2008 Iwate-Miyagi Nairiku earthquake ($M_w$ 6.9, $M_{jma}$ 7.2) occurred on 14 June 2008 in Japan. The amplification and asymmetric waveform of the vertical acceleration at the ground surface recorded by accelerometers at station IWTH25, situated 3 km from the source, were remarkable in two ways. First, the vertical acceleration was extremely large (PGA = 38.66 $m/s^2$ for the vertical component, PGA = 42.78 $m/s^2$ for the sum of the three components). Second, an unusual asymmetric waveform, which is too far above the zero acceleration axis, as well as large upward spikes were observed. Using a multidegree-of-freedom (MDF) system consisting of a one-dimensional continuum subjected to vertical acceleration recorded at a depth of 260 m below ground level, the present paper clarifies numerically that these singular phenomena in the surface vertical acceleration records occurred as a result of the jumping and collision of a layer in vertical motion. We herein propose a new mechanism for such jumping and collision of ground layers. The unexpected extensive landslides that occurred in the area around the epicenter are believed to have been produced by such jumping under the influence of vertical acceleration.

Keywords

References

  1. Aoi, S., Kunugi, T. and Fujiwara, H. (2008), "Trampoline effect in extreme ground motion", Science, 322(5902), 727-730. https://doi.org/10.1126/science.1163113
  2. Cole, G., Dhakal, R., Carr, A. and Bull, D. (2010), "An investigation of the effects of mass distribution on pounding structures", Earthq. Eng. Struct. D., 40(5), 641-659.
  3. Clogh, R.W. and Penzien, J. (1975), Dynamic of structures, McGraw-Hill.
  4. Editorial Community of Handbook of soils and foundations (1999), Handbook of soils and foundations (in Japanese), The Japanese Geotechnical Society.
  5. Goldsmith, W. (2001), Impact: The theory and physical behaviour of colliding solids, Dover Publications, Inc., New York.
  6. Jankowski, R. (2005), "Non-linear viscoelastic modeling of earthquake-induced structural pounding", Earthq. Eng. Struct. D., 34(6), 595-611. https://doi.org/10.1002/eqe.434
  7. K-net and KiK-net station. (2008), http://www.kik.bosai.go.jp/kik, National Research Institute for Earth Science and Disaster Prevention.
  8. Ohsaki, Y. (1991), Foundation of structures (in Japanese), Gihodo.
  9. Ohsaki, Y. (1994), New introduction of spectrum analysis for earthquake (in Japanese), Kashima Press.
  10. Paz, M. (1991), Structural dynamics, 3rd ed., Van Nostrand Reinhold, New York.
  11. Tahghighi, H. (2011), "Earthquake fault-induced surface rupture-A hybrid strong ground motion simulation technique and discussion for structural design", Earthq. Eng. Struct. D., 40(5), 1951-1608.
  12. Tothong, P. and Cornell, C.A. (2008), "Structural performance assessment under near-source pulse-like ground motions using advanced ground motion intensity measures", Earthq. Eng. Struct. D., 37(7), 1013-1037. https://doi.org/10.1002/eqe.792
  13. Yang, D., Pan, J. and Li, G. (2009), "Non-structure-specific intensity measure parameters and characteristic period of near-fault ground motions", Earthq. Eng. Struct. D., 38(11) 1257-1280. https://doi.org/10.1002/eqe.889
  14. Yamada, M., Mori, J. and Heaton, T. (2009), "The slapdown phase in high-acceleration records of large Earthquake", Seismol. Res. Lett., 80(4), 559-564. https://doi.org/10.1785/gssrl.80.4.559
  15. Yamada, M., Yamada, M., Hada, K., Ohmi, S. and Nagao, T. (2010), "Spatially dense velocity structure exploration in the source region of the Iwate-Miyagi Nairiku earthquake", Seismol. Res. Lett., 81(4), 597-604. https://doi.org/10.1785/gssrl.81.4.597
  16. Yamada, M., Mori, J. and Ohmi, S. (2010), "Temporal changes of subsurface velocities during strong shaking as seen from seismic interferometry", J. Geophys. Res., 115(B03302), 1-10.
  17. Takabatake, H., Mukai, H. and Hirano, T. (1993), "Doubly symmetric tube structures II: Dynamic analysis", J. Struct. Eng.-ASCE, 119(7), 2002-2016. https://doi.org/10.1061/(ASCE)0733-9445(1993)119:7(2002)
  18. Takabatake, H., Nonaka, T. and Umeda, Y. (2008), "Implications of thrown-out boulders for earthquake shaking", J. Earthq. Eng., 12(8), 1325-1343. https://doi.org/10.1080/13632460802212931

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