A new estimate for present-day Cocos-Caribbean plate motion: Implications for slip along the Central American volcanic arc

Details A new estimate for present-day Cocos-Caribbean plate motion: Implications for slip along the Central American volcanic arc A new estimate for present-day Cocos-Caribbean plate motion: Implications for slip along the Central American volcanic arc

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.4043d&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 21, p. 4043-4046

Physics

86

Geodesy And Gravity: Crustal Movements-Interplate, Tectonophysics: Continental Neotectonics, Tectonophysics: Continental Tectonics-General, Tectonophysics: Rheology-Crust And Lithosphere

Scientific paper

Velocities from 153 continuously-operating GPS sites on the Caribbean, North American, and Pacific plates are combined with 61 newly estimated Pacific-Cocos seafloor spreading rates and additional marine geophysical data to derive a new estimate of present-day Cocos-Caribbean plate motion. A comparison of the predicted Cocos-Caribbean direction to slip directions of numerous shallow-thrust subduction earthquakes from the Middle America trench between Costa Rica and Guatemala shows the slip directions to be deflected 10° clockwise from the plate convergence direction, supporting the hypothesis that frequent dextral strike-slip earthquakes along the Central American volcanic arc result from partitioning of oblique Cocos-Caribbean plate convergence. Linear velocity analysis for forearc locations in Nicaragua and Guatemala predicts 14+/-2mmyr-1 of northwestward trench-parallel slip of the forearc relative to the Caribbean plate, possibly decreasing in magnitude in El Salvador and Guatemala, where extension east of the volcanic arc complicates the tectonic setting.

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