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A model of convergent plate margins based on the recent tectonics of Shikoku, JapanA viscoelastic finite element plate tectonic model is applied to displacement data for the island of Shikoku, Japan. The flow properties and geometry of the upper portions of the earth are assumed known from geophysical evidence, and the loading characteristics are determined from the model. The nature of the forces acting on the Philippine Sea plate, particularly in the vicinity of the Nankai trough, is determined. Seismic displacement data related to the 1946 Nankaido earthquake are modeled in terms of a thick elastic plate overlying a fluidlike substratum. The sequence of preseismic and seismic displacements can be explained in terms of two independent processes operating on elastic lithospheric plates: a strain accumulation process caused by vertical downward forces acting on or within the lithosphere in the vicinity of the trench, and a strain release process caused by plate failure along a preexisting zone on weakness. This is a restatement of Reid's elastic rebound theory in terms of elastic lithospheric plates.
Document ID
19750030562
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Bischke, R. E.
(Lamont-Doherty Geological Observatory Palisades, N.Y., United States)
Date Acquired
August 8, 2013
Publication Date
November 10, 1974
Publication Information
Publication: Journal of Geophysical Research
Volume: 79
Subject Category
Geophysics
Accession Number
75A14634
Funding Number(s)
CONTRACT_GRANT: NGR-33-008-146
Distribution Limits
Public
Copyright
Other

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