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Constraints on interseismic deformation at Japan trench from VLBI dataSpace geodetic data from very long baseline interferometry (VLBI) was used to estimate velocity relative to the plate interiors of two sites on the deforming leading edge at the Japan trench. Elastic models of interseismic deformation and results obtained were used to put constraints on the slip rate along the main thrust of the Japan subduction zone. Observed velocities reflect the sum of permanent west-northwest shortening in Honshu, elastic deformation due to locking of the main thrust fault at the Japan trench, and deformation associated with the subducting Phillipine plate. These velocities limit the locked segment of the main thrust at the Japan trench to 27 km vertically and 100 km along the dip. This indicates that the main Pacific plate thrust fault is not strongly coupled and probably does not generate strong earthquakes.
Document ID
19930051838
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Argus, Donald F.
(JPL Pasadena, CA, United States)
Lyzenga, Gregory A.
(Harvey Mudd College, Claremont; JPL, Pasadena CA, United States)
Date Acquired
August 16, 2013
Publication Date
April 9, 1993
Publication Information
Publication: Geophysical Research Letters
Volume: 20
Issue: 7
ISSN: 0094-8276
Subject Category
Geophysics
Accession Number
93A35835
Distribution Limits
Public
Copyright
Other

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