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A Study Of The Beach Terraces On Muroto Peninsula, Island Of Shikoku, Southwestern Japan
Toth, Joseph William
Toth, Joseph William
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1978
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Earth and Environmental Science
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http://dx.doi.org/10.34944/dspace/8404
Abstract
The three sets of raised beach terraces exposed on Muroto Peninsula, Shikoku, Japan are the result of a landward tilting of the lithosphere which results from a seismicly induced elastic rebounding. The terraces all tilt to the north and converge near the hinge line of the great 1946 Nankaido earthquake. A model for terrace formation is developed which is a combination of simple beam theory and thrust fault elastic rebound theory. Axial stress drops of 320 to 425-bars are subtracted from axial loads which are applied to an initially downwarped 24 km thick lithosphere which overlies an asthenosphere of 10^19 poise viscosity. This results in a modeled coseismic uplift of 120 cm; in agreement with observations on Muroto Point. Also consistent with the observations is the modeled coseismic landward shift of the hinge line position, and the modeled post-seismic seaward shift of the hinge line position after the earthquake. Finally, a tectonic uplift rate of between 17.5 and 24 cm/century is obtained by the model in agreement with Yoshikawa's et al. (1964) uplift rate for Muroto Point.
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