Quantification of major earthquake tsunamis of the Japan Sea

Details Quantification of major earthquake tsunamis of the Japan Sea Quantification of major earthquake tsunamis of the Japan Sea

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pepi...38..214a&link_type=abstract

Physics of the Earth and Planetary Interiors, Volume 38, Issue 4, p. 214-223.

Physics

7

Scientific paper

The size of major tsunamigenic earthquakes which occurred in the Japan Sea is quantified on the basis of seismic and tsunamigenic source parameters. The tsunami magnitude Mt is determined from the instrumental tsunami-wave amplitudes. The Mt values thus obtained are on average 0.2 units larger than the values of moment magnitude Mw, though the Mt scale has originally been adjusted to agree with Mw. Moreover, the volume of displaced water at the source is on average 2.3 times as large as that for the Pacific events with a comparable Mw. Nevertheless, the observed height of the sea-level disturbance at the source is found consistent with the amount of crustal deformation computed for the seismic fault models. These results indicate that the tsunami source potential itself is large for Mw in comparison with the Pacific events. The large source potential is explained in terms of the effective difference both in the rigidity of the source medium and in the geometry of the fault motion. For the Japan Sea events, the Mt scale still provides the physical measure of the tsunami potential, and Mt minus 0.2 corresponds to Mw. This predicts that the maximum amplitude of tsunami waves from Japan Sea earthquakes is at least two times as large as that from Pacific earthquakes with a comparable Mw.

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