Physics
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..142..185n&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 142, Issue 3-4, p. 185-203.
Physics
12
The Ryukyu Arc, Gps, Rigid Block Rotation Model, Backarc Spreading
Scientific paper
Using a GPS derived velocity field, we try to estimate the kinematic features of the Ryukyu arc, and discuss its implications to the spreading of the Okinawa trough. The GPS derived strain rate field implies that internal deformation within the Ryukyu arc is not significant, therefore, we adopt a rigid block rotation model for the motion of the Ryukyu arc. The velocity field in the Ryukyu arc is best explained by a model with three blocks rather than one with only one block. The estimated block rotations predict the spreading along the Okinawa trough. The predicted spreading is slow (10mm per year) in the north and fast (50mm per year) in the southwest. The direction of the predicted spreading is normal to the Okinawa trough (N170°E-N180°E) in the southwest, while in the north the direction of the spreading is oblique to the Okinawa trough (N150°E-N180°E).
Ando Masataka
Hashimoto Manabu
Nishimura Sou
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