Tectonic analysis of lineaments near a spreading axis, northeastern Iceland

Some aspects of Iceland geodynamics are investigated from Landsat multispectral scanner (MSS) digital data in conjunction with field studies. Lineaments at the 1: 500,000 scale were mapped from computer processed imagery designed to enhance subtle structural fabric elements within the data. The analyses indicate pervasive north and west-northwest-trending lineaments. These trends are interpreted in terms of alternative complex models involving Riedel shear deformation or thermoelastic contraction adjacent to a spreading center. West-northwest-trending lineaments are concentrated along the Husavik-Flatey fault system. East of Axarfjordur, a 20-km wide band of west-northwest lineaments could mark the onshore continuation of the Grimsey submarine fault proposed on the basis of earthquake distributions.