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Journal of Seismology

, Volume 12, Issue 2, pp 185–195 | Cite as

Prediction of ground motion in the Osaka sedimentary basin associated with the hypothetical Nankai earthquake

  • Haruko Sekiguchi
  • Masayuki Yoshimi
  • Haruo Horikawa
  • Kunikazu Yoshida
  • Sunao Kunimatsu
  • Kenji Satake
Open Access
Original article

Abstract

We studied the long-period ground motions in the Osaka sedimentary basin, Japan, which contains a 1- to 3-km thickness of sediments and is the site of many buildings or construction structures with long-natural period. We simulated the broadband ground motions likely to be produced by the hypothetical Nankai earthquake: the earthquake expected to give rise to the most severe long-period ground motion within the basin. For the simulation, we constructed multiscale heterogeneous source models based on the Central Disaster Management Council of Japan (CDMC) source model and adopted a hybrid computation method in which long-period motion and short-period motion are computed using a 3-D finite difference method and the stochastic Green’s function method, respectively. In computing long-period motions, we used a 3-D structure model of the crust and the Osaka sedimentary basin. The ground motions are estimated to have peak velocities of 50–90 cm/s, prolonged durations exceeding 300 s, and long predominant periods of 5–10 s in the area with great thickness of sediments. The predominant periods are in agreement with an approximate evaluation by 4 H/V s where H and V s are the thickness of the sediment and the average S wave velocity, respectively.

Keywords

Long-period ground motion Ground motion prediction Osaka Basin Nankai earthquake Hybrid method Finite-difference method Fluctuation Subsurface structure 

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Copyright information

© The Author(s) 2007

Authors and Affiliations

  • Haruko Sekiguchi
    • 1
  • Masayuki Yoshimi
    • 1
  • Haruo Horikawa
    • 1
  • Kunikazu Yoshida
    • 1
  • Sunao Kunimatsu
    • 1
  • Kenji Satake
    • 1
  1. 1.Geological Survey of JapanNational Institute of Advanced Industrial Science and Technology (AIST)IbarakiJapan

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