1. Institute of Geophysics, University of Tehran, P.O. Box 14155 6466, Postal Code 1435944411, Tehran, Iran, hamidjavan@ut.ac.irnmirzaii@ut.ac.ir
2. School of Civil Engineering, College of Engineering, University of Tehran, P.O. Box 11165‐4563, Tehran, Iran, ghadi@ut.ac.ir