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زمين ساخت جنبا در ناحيه نطنز

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This paper uses geomorphic features to constrain active structural deformation at the Natanz region, central Iran. Offset stream beds indicate rightlateral strike slip motion at a rate of about 2.5 mm/yr along the NW-SE trending Qom-Zefreh fault zone. Deep incision of the Moghar river which crosses the Charkheh and Zardkuh anticlines also indicates uplift at depth on thrust faults dipping SSW beneath the anticlines. The fact that the active Qom-Zefreh strike-slip fault runs parallel to the active fold and thrust zone suggests that oblique motion of Arabia with respect to Eurasia is partitioned in this part of central Iran. We conclude that the active blind faults which leave clear signatures in geomorphology should be seriously considered as a seismic source while assessing seismic hazard in the region.

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