Abstract
The compression-extension passage in the eastern Iberian Chain during the Miocene is analyzed; structural data suggest that it is a gradual change in stress regime which does not involve rotation but interchange of σ 1 and σ 2 axes, one of them remaining always vertical. The gradual stress evolution is interpreted by a numerical-graphic method ( y- R diagram) which optimizes combinations of y (azimuth of the maximum horizontal axis) and R (stress ratio) explaining groups of fault movements. The y- R diagrams of some fault populations measured in the Castellón region provide optimum tensors appearing within a continuous cloud of solutions from the compressional field to the extensional one. Movement sequences obtained from superimposed striations indicate a systematic stress change between these two regimes.
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