Kinematics of the Nicaraguan forearc from GPS geodesy

Henry L. Turner, Peter LaFemina, Armando Saballos, Glen S. Mattioli, Pamela E. Jansma, Timothy Dixon

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Abstract

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 ∼5 mm yr-1.

Original languageEnglish (US)
Article numberL02302
JournalGeophysical Research Letters
Volume34
Issue number2
DOIs
StatePublished - Jan 28 2007

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Earth and Planetary Sciences(all)

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