Modeling a tsunami generated by the Tokachi-Oki earthquake of Mw 8.3 [03/09/26]

Disaster Control Research Center (DCRC), Tohoku Univ.

and

Shunichi Koshimura
Disaster Reduction and Human Renovation Inst.

The following in Japanese only is the link to comple the all data obtained on the field by the survey team:

Tsunami PAGE on the CE, AKITA UNIVERTITY



Numerical modeling of tsunami

Numerical modeling of tsunami was performed by using TUNAMI code of DCRC. The model is based on the linear shallow water theory. Seismic deformation modeling is based on the theory of Okada (1985). The computational grid size is approximately 500 m

[Earthquake mechanisms]

Model-1 [Yamanaka and Kikuchi (Preliminary result , 03/09/26/14:30)]
  • Epicenter = (41.78 N, 144.079 E)
  • (Strike, Dip, Slip) = (210, 17, 91)
  • (L,W) = (80 km, 80 km)
  • Dislocation = 3.6 m
  • Depth = 28 km

Model-2 [Yamanaka and Kikuchi (Preliminary result , 03/09/26/22:00)]

  • Epicenter =(41.78 N, 144.079 E)
  • (Strike, Dip, Slip) = (210, 17, 91)
  • (L,W) = (80 km, 80 km)
  • Dislocation = 2.6 m
  • Depth = 13 km

Model-3 [Harvard Univ Mechanisms (03/09/25)]

  • Epicenter = (42.25 N, 143.78 E)
  • (Strike, Dip, Slip) = (252, 11, 136)
  • (L,W) = (156 km, 78 km)
  • Dislocation = 5.62 m
  • Depth = 13 km

[Seismic deformation modeling]

[Comp uted tsunami waveforms]

See this map for points of modeling output.

[Maximum tsunami height]

[Tsun ami movies(Quick Time Player Required)]