Geodetic GPS measurements in south Iceland: Strain accumulation and partitioning in a propagating ridge system
| Autor: | P. C. LaFemina, Timothy H. Dixon, Thóra Árnadóttir, Erik Sturkell, Freysteinn Sigmundsson, Rocco Malservisi, Páll Einarsson |
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| Rok vydání: | 2005 |
| Předmět: |
Atmospheric Science
Soil Science Mid-Atlantic Ridge Aquatic Science Oceanography Geochemistry and Petrology Earth and Planetary Sciences (miscellaneous) medicine Earth-Surface Processes Water Science and Technology geography Rift geography.geographical_feature_category Ecology Fissure Paleontology Forestry Block (meteorology) Geodesy Geophysics medicine.anatomical_structure Volcano Space and Planetary Science Magma Ridge (meteorology) Rift zone Seismology Geology |
| Zdroj: | Journal of Geophysical Research: Solid Earth. 110 |
| ISSN: | 0148-0227 |
| DOI: | 10.1029/2005jb003675 |
| Popis: | [1] GPS observations in south Iceland between 1994 and 2003 are compared with two-dimensional 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 ( |
| Databáze: | OpenAIRE |
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