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Plate tectonics and crustal deformation around the Japanese IslandsWe analyze over a century of geodetic data to study crustal deformation and plate motion around the Japanese Islands, using the block-fault model for crustal deformation developed by Matsu'ura et al. (1986). We model the area including the Japanese Islands with 19 crustal blocks and 104 faults based on the distribution of active faults and seismicity. Geodetic data are used to obtain block motions and average slip rates of faults. This geodetic model predicts that the Pacific plate moves N deg 69 +/- 2 deg W at about 80 +/- 3 mm/yr relative to the Eurasian plate which is much lower than that predicted in geologic models. Substantial aseismic slip occurs on the subduction boundaries. The block containing the Izu Peninsula may be separated from the rigid part of the Philippine Sea plate. The faults on the coast of Japan Sea and the western part of the Median Tectonic Line have slip rates exceeding 4 mm/yr, while the Fossa Magna does not play an important role in the tectonics of the central Japan. The geodetic model requires the division of northeastern Japan, contrary to the hypothesis that northeastern Japan is a part of the North American plate. Owing to rapid convergence, the seismic risk in the Nankai trough may be larger than that of the Tokai gap.
Document ID
19940033397
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Hashimoto, Manabu
(Geographical Survey Inst. Tsukuba, Japan)
Jackson, David D.
(California Univ. Los Angeles, United States)
Date Acquired
August 16, 2013
Publication Date
September 10, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: B9
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
94A10052
Funding Number(s)
CONTRACT_GRANT: NSF EAR-86-18393
CONTRACT_GRANT: NAGW-5447
Distribution Limits
Public
Copyright
Other

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