Abstract
Large-scale strike-slip faults, generating earthquakes that can reach M 7–7.5, are common in the Tjörnes fracture zone in North Iceland, the Borgarfjördur area in West Iceland, and the South Iceland seismic zone. Strike-slip faulting in the Tjörnes fracture zone is controlled by a typical oceanic transform-fault stress field. The two other areas are located between partly overlapping volcanic zones where shear-stress concentration controls the strike-slip faulting. The maximum cumulative strike-slip displacement on the faults is a few tens of metres. Some faults have been subject to both dextral and sinistral slip. Boundary-element results indicate that the remote applied shear stress available in the areas of strike-slip faulting in Iceland is 7–12 MPa. The shear stress that drives the largest strike-slip faults, however, is of the order of 1–3 MPa.
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