EVALUATION OF THE EFFECTIVENESS OF RISK REDUCTION MEASURES FOR EARTHQUAKE ASSOCIATED GEO-HAZARDS IN TEHRAN

Tehran is located in a seismic prone zone in north central part of Iran along Alpine-Himalayan orogenic belt. The city has experiences many destructive earthquakes in its history and it is expected to be affected by strong earthquakes in future as well. Considering the geological setting of this city, it is expected that any potential earthquake in Tehran may associate with some geological instabilities. In this paper, the potential geo-hazards that may associate with earthquake in Tehran including ground motion amplification due to site effects, slope instabilities (landslides and rock-falls), liquefaction and land subsidence due to collapse of existing Qanats (underground irrigation tunnels) will be introduced. In addition some measures to reduce the potential impacts of such hazards will be presented and discussed. Furthermore, the criteria for controlling the growth of the city towards hazard zone that have been reflected into the Master Plan of Tehran will be also introduced.