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Mechanism of underthrusting in southwest Japan: A model of convergent plate interactionsAn elastic rebound mechanism consistent with underthrusting at the time of the magnitude 8.2 Nankaido earthquake of 21 December, 1946 accounts for a reversal in sense between seismic and preseismic changes in elevation throughout a large portion of southwest Japan. It is shown that the seismic movements during the earthquake were generated by slip on a complex thrust fault that is inferred to intersect the surface near the base of the continental slope. The preseismic deformation is explained by strain accumulation equivalent to a virtual dislocation with the same orientation as the fault surface but a sense opposite to that of the real dislocation that occurred at the time of the earthquake. Adjustments by slip along the fault surface and extensions of that surface can account for postseismic movements.
Document ID
19720023745
Acquisition Source
Legacy CDMS
Document Type
Contractor Report (CR)
Authors
Fitch, T. J.
(Lamont-Doherty Geological Observatory Palisades, NY, United States)
Scholz, C. H.
(Lamont-Doherty Geological Observatory Palisades, NY, United States)
Date Acquired
August 6, 2013
Publication Date
July 1, 1971
Subject Category
Geophysics
Report/Patent Number
NASA-CR-122521
Accession Number
72N31395
Funding Number(s)
CONTRACT_GRANT: NGR-33-008-146
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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