A Method to Determine the Level 1 and Level 2 Tsunami Inundation Areas for Reconstruction in Eastern Japan and Possible Application in Pre-disaster Areas - Post-Tsunami Hazard: Reconstruction and Restoration - page 136

Fig. 10.4 The results of the seabed displacement model for earthquakes with magnitudes larger
than 8 Mw in the Tohoku region. The upper legend is used for (1) to (8) and the lower legend is
used for (9) to (12)
Hoei earthquake (M 8.4; Ando 1975 ; Aida 1981a , b ; Furumura et al. 2011 ), the 1854
Ansei Tokai earthquake (M8.4; Ando 1975 ; Aida 1981a ) and the 1944 Showa
Tonankai earthquake (M7.9; Kanamori 1972 ; Ando 1975 ; Inouchi and Sato 1975 ;
Ishibashi 1981 ; Aida 1979 ) were modeled, and the results of the their seabed
displacement models are given in Fig. 10.5 .
Those historical events were then enhanced by extending the tensor parameters to
larger magnitudes, up to M 9.0. In addition, we simulated the scenario recently
developed by the Center of Disaster Management, Cabinet Offi ce of Japan. This
scenario accommodates slip variability in the shallow sediment along the Tokai,
Tonankai and Nankai trenches (Cabinet Offi ce of Japan 2013 ). In contrast to the
Sendai plain, more historical data are available for the southern part of Japan. Thus,
the earthquake scenario could be extended to 137 cases. Half of these cases were M
7 class earthquakes, 30 % were M 8 class earthquakes, and the other 20 % were M 9
class earthquakes. Among the total number of modeled scenarios, only 64 scenarios
generated tsunami inundation of Owase City, and these were used for further analysis
(the earthquake parameters are given in Table 10.2 at the end of this chapter).