Tehran megacity, the political and economical capital of Iran with population of more than eight million residents, is situated in the seismically active zone of Alborz. The seismicity pattern of this zone shows occurrence of large earthquakes in long time periods (Masson et al., 2005). Several large earthquakes such as the 855 A.D.Ms 7.1, the 958 A.D.Ms 7.7, and the 1117 A.D.Ms 7.2 in the historical seismic catalog of Tehran and surrounding area proves that the city has a high level of seismic risk (Fig. 1). The last disastrous example...

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