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Geodetic GPS measurements in south Iceland - Rosenstiel School ...

Geodetic GPS measurements in south Iceland - Rosenstiel School ...

Geodetic GPS measurements in south Iceland - Rosenstiel School

JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 110, B11405, doi:10.1029/2005JB003675, 2005 Geodetic GPS measurements in south Iceland: Strain accumulation and partitioning in a propagating ridge system P. C. LaFemina, 1 T. H. Dixon, 1 R. Malservisi, 1,2 T. Árnadóttir, 3 E. Sturkell, 3 F. Sigmundsson, 3 and P. Einarsson 4 Received 7 February 2005; revised 20 May 2005; accepted 1 August 2005; published 18 November 2005. [1] GPS observations in south Iceland between 1994 and 2003 are compared with twodimensional elastic half-space and viscoelastic coupling models for two parallel rift zones, representing the Western and Eastern volcanic zones (WVZ, EVZ). GPS data from the Hreppar block, between the WVZ and EVZ, fit a rigid block model within uncertainties. Spreading rates across the WVZ increase from 2.6 ± 0.9 mm/yr in the northeast to 7.0 ± 0.4 mm/yr in the southwest. Conversely, spreading rates in the EVZ decrease from 19.0 ± 2.0 mm/yr in the northeast to 11.0 ± 0.8 mm/yr in the southwest, the direction of ridge propagation. Summed extension rates across the two rift zones are approximately constant and equal to the total plate rate, 18–20 mm/yr, consistent with a simple propagating ridge model whereby the WVZ is deactivating in the direction of EVZ propagation. The coupling model confirms results from the simple elastic half-space model, including relatively shallow locking depths (

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