Strain accumulation 1986-1992 across the Reykjanes Peninsula plate boundary, Iceland, determined from GPS measurements

Details Strain accumulation 1986-1992 across the Reykjanes Peninsula plate boundary, Iceland, determined from GPS measurements Strain accumulation 1986-1992 across the Reykjanes Peninsula plate boundary, Iceland, determined from GPS measurements

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994georl..21..125s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 21, no. 2, p. 125-128

Mathematics

Logic

12

Boundaries, Earthquakes, Geodynamics, Geological Faults, Geophysics, Global Positioning System, Iceland, Plates (Tectonics), Seismology, Shear Strain, Strain Rate, Stresses, Structural Properties (Geology), Tectonics, Compression Loads, Graphs (Charts), Maps, Mathematical Models, Sliding, Velocity, Volcanoes

Scientific paper

Global Positioning System (GPS) geodetic observations 1986-1992 spanning the oblique plate boundary on the Reykjanes Peninsula, SW Iceland, show that left-lateral shear strain is accumulating in the area. The principal strain rates are: dot-epsilon(sub 1) = 0.255 +/- 0.055 microstrain/yr (extension) at N121 +/- 6 deg E, and dot-epsilon (sub 2) = -0.190 +/- 0.053 microstrain/yr (contraction) at N31 +/- 6 deg E. The principal axis of extension is perpendicular to the strike of fractures within volcanic systems on the Peninsula. The direction of maximum left-lateral shear strain is N76 +/- 6 deg E, the same as the trend of the seismic zone on the Peninsula. Tensor shear strain in this direction is -0.222 +/- 0.054 microstrain/yr. Continuous aseismic slip of the North American-Eurasian plates below a 5-11 km locking depth on the Peninsula can explain the observed depth of earthquakes, the width of the deformation zone determined from recent fissuring and faulting, and the GPS-measurements of strain.

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