Other
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997georl..24.1315t&link_type=abstract
Geophysical Research Letters, Volume 24, Issue 11, p. 1315-1318
Other
24
Oceanography: Physical: Nearshore Processes, Oceanography: Physical: Tsunamis And Storm Surges, Seismology: Seismic Hazard Assessment And Prediction, Seismology: Earthquake Ground Motions And Engineering
Scientific paper
The tsunami generated by the July 12, 1993 Hokkaido-Nansei-Oki Mw=7.8 earthquake produced in Japan the worst local tsunami-relate death toll in fifty years, with estimated 10-18m/sec overland flow velocities and 30m runup. These extreme values are the largest recorded in Japan this century and are among the highest ever documented for non-landslide generated tsunamis. We model this event to confirm the estimated overland flow velocities, and we find that, given reasonable ground deformation data, current state-of-the-art shallow-water wave models can predict tsunami inundation correctly including extreme runup, current velocities and overland flow. We find that even small local topographic structures affect the runup to first-order, and that the resolution of the bathymetric data is more important than the grid resolution. Our results qualitatively suggest that-for this event-coastal inundation is more correlated with inundation velocities than with inundation heights, explaining also why threshold-type modeling has substantially underpredicted coastal inundation for this and other recent events.
Synolakis Costas Emmanuel
Titov Vasily V.
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