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A model for the motion of the Philippine Sea plate consistent with NUVEL-1 and geological dataWe investigate angular velocity vectors of the Philippine Sea (PH) plate relative to the adjacent major plates, Eurasia (EU) and Pacific (PA), and the smaller Caroline (CR) plate. Earthquake slip vector data along the Philippine Sea plate are inverted, subject to the constraint that EU-PA motion equals that predicted by the global relative plate model NUVEL-1. The resulting solution fails to satisfy geological constraints along the Caroline-Pacific boundary: convergence along the Mussau Trench and divergence along the Sorol Trough. We then seek solutions satisfying both the CR-PA boundary conditions and the Philippine Sea slip vector data, by adjusting the PA-PH and EU-PH best fitting poles within their error ellipses. We also consider northern Honshu to be part of the North American plate and impose the constraint that the Philippine Sea plate subducts beneath northern Honshu along the Sagmi Trough in a NNW-NW direction. Of the solutions satisfying these conditions, we select the best EU-PH as 48.2 deg N, 157.0 deg E, 1.09 deg/my, corresponding to a pole far from Japan and south of Kamchatka, and PA-PH, 1.2 deg N, 134.2 deg E, 1.00 deg/my. Predicted NA-PH and EU-PH convergence rates in central Honshu are consistent with estimated seismic slip rates. Previous estimates of the EU-PH pole close to central Honshu are inconsistent with extension within the Bonin backarc implied by earthquake slip vectors and NNW-NW convergence of the Bonin forearc at the Sagami Trough.
Document ID
19950045506
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Seno, Tetsuzo
(Univ. of Tokyo Tokyo, Japan)
Stein, Seth
(Northwestern Univ. Evanston, IL, United States)
Gripp, Alice E.
(Northwestern Univ. Evanston, IL, United States)
Date Acquired
August 16, 2013
Publication Date
October 10, 1993
Publication Information
Publication: Journal of Geophysical Research
Volume: 98
Issue: B10
ISSN: 0148-0227
Subject Category
Geophysics
Accession Number
95A77105
Funding Number(s)
CONTRACT_GRANT: NAG5-885
CONTRACT_GRANT: NSF EAR-91-16193
Distribution Limits
Public
Copyright
Other

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