Rudbar Lorestan Dam Design and Local Faults

Abstract eng:
The Rudbar Lorestan Dam area is located in the High Zagros Seismotectonic province of Iran. The access to the area especially the dam site for tectonically mapping is rather difficult. The dam site is close to two main structures. Main Zagros Reverse fault to the Northeast of dam and a segment of the Main Zagros Recent Fault (Saravand-Baznavid) on the Southwest of the dam site. Several big earthquakes occurred along the Main Recent Fault. One of the most important one was Silakhor earthquake with Ms7.4. A strike-slip local fault (F1) is passing from the dam site. Measured maximum displacement of the F1 fault on the dam site is about 6 m. This displacement can be due to several movements. On the right abutment another local fault is located by the name F10 and which appear shearing of the bedding plane. Based on the Termoluminescence method of samples from the fault planes motion estimated about 3-8 thousand years. The F1 Fault surface is smooth, and there are very prominent striations ranging in scale from fine slickensides to CM scale grooves, tool marks and corrugations. Besides the fault F1 and F10 there are a number of other local faults which may also be removed during the reactivation of Main Recent Fault. For dynamic analysis of dam body an earthquake with Ms7.4 is selected for reactivation of SaravandBaznavid fault.

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