The Gulab 2 water transmission tunnel in order to supply water to Isfahan city in the length of 17 km from the end of the Gulab tunnel has been done. This tunnel is located in Sanandaj - Sirjan zone and lithostratigraphic the oldest formations of the tunnel site are Paleozoic metamorphic rocks. Based on geological studies, Gulab 2 tunnel in Khamiran shale formation under the alluvial plain has been drilled which mainly is directed in NW-SE. As seismotectonic, the tunnel is located in the northwest of the Zagros zone and witnesses various earthquake events with various magnitudes. Based on seismic calculations, to determine the seismic parameters by probabilistic methods, the tunnel site classification is average risk rating and Gulab 2 tunnel is level 1-important class. Manuscript profile