Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 34, Issue 2, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2006GL027586
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Funding
- Directorate For Geosciences
- Division Of Earth Sciences [1063247] Funding Source: National Science Foundation
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Campaign GPS data from a network in the Nicaraguan forearc show a strong component of arc-parallel motion indicating northwest translation of a nearly rigid forearc sliver. Our measured mean velocity for forearc sites of 15.1 mm yr(-1) agrees well with the arc-parallel sliver motion predicted previously by DeMets ( 2001) derived from closure constraints on oblique convergence between the Cocos and Caribbean plates. The lack of a northeasterly oriented arc-normal component of motion in forearc velocities indicates that there are complexities involved beyond a simple interpretation of sliver motion being driven by oblique convergence. The forearc is reasonably well-fit by rigid rotation about an Euler pole with a rms misfit of residual velocities of 4.9 +/- 2.6 mm yr(-1). Current motion of the forearc sliver relative to the stable Caribbean plate yields predominantly boundary parallel NW motion with boundary normal extension in the northwestern region averaging similar to 5 mm yr(-1).
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