Abstract
During a scenario earthquake with MJ7.8 nearby Ryukyu Trench, not only strong motion but also huge tsunami with the maximum water level and run-up height of 6m and 15m, respectively is predicted in central Ishigaki City, Okinawa Prefecture, Japan. In this paper, seismic waveforms in the tsunami attack area were first predicted with very high density based on the SMGA models and microtremor measurements. Walking times from the prediction sites to the designated refuge places were then measured. Using non-evacuation time based on the time history of instrumental seismic intensity and measured time based on results of the walking experiment, finally, we evaluated the difficult area for tsunami evacuation in central Ishigaki City.
