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This paper presents the results of a new type of analogue model for prograding strike-slip faulting. In this model a small pre-existing basement fault is subjected to a strike-slip type stress field and allowed to prograde naturally into the homogeneous material. We used X-ray computer to- mographic scanning to monitor the development of faulting in the model. The model shows the formation of coulomb shears at the tip of the fault. These coulomb shears all bend- off towards the receding block of the model, as is predicted by the theory. The shears are formed one after the other and abandoned splays are activated in a normal sense. On top of the basement layer, a second, weaker layer is applied to rep- resent the sedimentary cover. We see the development of a pop-up structure above the pre-existing part of the basement fault. The normal movement on the abandoned splays of the growing fault make that a small pull-apart basin is formed at the location of the tip of the pre-existing basement fault. The complex history of the Pannonian Basin includes the forma- tion of different structural lineaments in the earth' crust. The activation of some of these structures under the present-day stress conditions makes the basin an ideal study area to study the growth of reactivated faults. The model is compared to the results of a shallow high-resolution seismics survey and a small field campaign in western Hungary, where we studied segments of the Balatonf˝ fault. On the basis of the seismic activity and similarity between our model and the observa- tions on the seismic sections and in the field, we conclude that active propagation of a segment of the Balatonf ˝ o fault is going on in the region.

Analogue modelling of a prograding strike-slip fault: Case study of the Balatonf&#246; fault, western Hungary

Analogue modelling of a prograding strike-slip fault: Case study of the Balatonfö fault, western Hungary