[S-SS04] Strong Ground Motion and Earthquake Disaster

[SSS04-15] Modeling procedure of fault rupturing with detailed information of surface traces for predicting strong motions and permanent displacements

*Kazuo Dan¹, Saruul Dorjpalam¹, Atsuko Oana², Kensuke Arai², Hiroyuki Fujiwara³, Nobuyuki Morikawa³ (1.Ohsaki Research Institute, Inc., 2.Shimizu Corporation, 3.National Research Institute for Earth Science and Disaster Resilience)

Keywords:inland crustal earthquake, fault-rupturing model, surface fault trace, strong ground motion prediction, permanent displacement prediction, 2016 Kumamoto earthquake

We explained a modeling procedure of fault rupturing with detailed information of surface traces for predicting strong motions and permanent displacements.An example was shown for the 2016 Kumamoto earthquake, Japan. Figure 1 shows the seismic fault model (deep fault) obtained by Oana et al. (2019) and earthquake surface fault observed by Shirahama et al. (2016). Figure 2 shows an example of connecting the seismic fault (Futagawa segment) with the segment f01 of the earthquake surface faults. Figure 3 shows the slip-velocity time functions on the fault. Here, we assumed that the peak velocity on the shallow fault was a half the peak velocity on the seismic fault (deep fault). Figures 4 and 5 shows the calculation results of ground displacements.