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Project Summary: |
Independent Okhotsk and Amurian microplate motions are tested using
velocities from 123 GPS sites (80 from within the proposed OKH and AMU plate
boundaries) used to constrain the plate kinematics of northeast Asia. A
block modeling approach is used to incorporate both rigid block rotation and
near-boundary elastic strain accumulation effects in a formal inversion of
the GPS velocities. Models include scenarios with and without independent
OKH and AMU plate motion. Our modeling favors scenarios with independent OKH
and AMU motion, based on the application of F-test statistics. The
independent OKH plate rotates 0.231 deg/Myr clockwise with respect to North
America about a pole located north of Sakhalin. The modeled AMU plate
rotates 0.298 deg/Myr counterclockwise with respect to NAM about a pole
located west of the Magadan region. The plate-motion parameters of the
independent plates are consistent with the kinematics inferred from
earthquake focal mechanism solutions along their boundaries.
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Publications: |
Apel, E., R. Bürgmann, G. Steblov, N.
Vasilenko, R. King, and A. Prytkov (2006), Active tectonics of northeast Asia: Using
GPS velocities and block modeling to test independent Okhotsk plate motion, Geophys. Res. Lett., 33, doi:10.1029/2006GL026077.
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Tools: |
GPS Geodesy, Elastic Block Modeling |
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Geographic Location: |
Northeast Asia |
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Project Duration: |
2005-2006 |
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Group Members Involved: |
Edwin (Trey) Apel, Roland Bürgmann |
