Recently available seismological data reveal NE trending microseismic activity clusters in parts of the Oman Mountains, UAE. These data and focal mechanisms are combined with surface structural data to produce a simple neotectonic model to explain the seismicity of the terrain between Fujairah and Dibba. In this area there is a series of NE-SW to N-S trending faults limited in their southwestern extension by the NW trending Wadi Ham Fault (WHF). The faults show slip histories indicating multiple use during the Cretaceous and Tertiary-recent tectonic events. Since the late Tertiary these faults have dominantly normal slip histories. They provide a tensional release mechanism for stress build-ups on the N-S Zendan Fault, which separates the Makran subduction zone from the Zagros continent-continent (Alpine) zone. The Fujairah-Dibba section is modelled as a dilatational zone associated with the southern termination of the N-S trending Zendan Fault. One consequence of this model is that the previously reported dextral and sinistral slip on the WHF may not indicate significant changes in regional principal stress orientations.


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