The TFZ

$\\$This work has focussed on two aspects of seismotectonics: (1) to combine field and numerical studies with seismic studies from the extension of the SIL network in this area, (2) to study the effects of faulting on all scales on the migration of crustal fluids in a major fault zone like the TFZ. As regards the first aspect, a manuscript has already been submitted to JGR []. The purpose of this paper is to combine a detailed seismic analysis by Sigurdur Th. Rögnvaldsson and Ragnar Slunga with on-land field studies of the faults in the TFZ. Our conclusion is that many of the strike-slip faults in the Grímsey fault, as well as those associated with the Dalvík ``lineament'' are northerly trending sinistral faults rather than westerly trending dextral faults. We are working on numerical (boundary element) models with a view of explaining the current stress field in this area. As regards the second aspect an abstract entitled: Development of permeability in fault zones, was presented at the XXIII EGS General Assembly in Nice, April 1998. This work is discussed further in the next section. Work on the TFZ is in collaboration with Jacques Angelier, Francoise Bergerat, Sigurdur Th. Rögnvaldsson, Ragnar Slunga and Thierry Villemin.