Types of Earthquake Early Warning Systems and Evaluation of its Performance in Tehran

The importance of earthquake hazard in Tehran with intense of urban expansion process, the concentration of population, material and spiritual assets and threat to the earthquake crisis, is felt more than before. Earthquake early warning systems could be considered as an effective tool for reducing the vulnerability of Tehran. Due to the introduction of accelerometer systems with the real-time data, Tehran disaster mitigation and management organization (TDMMO) has provided the necessary facilities for the implementation and installation of early warning systems and assessment of the potential and effectiveness of this system in Tehran. In this study with a general overview on earthquake early warning system and its types in the world, estimating how large earthquakes based on real-time data as rapid estimation of earthquake source parameters in the first few seconds of receiving the initial wave, has introduced the case for the 2009 Shahr- e-Rey earthquake in Tehran. The logical relationship between the frequency and the seismic intensity of 2009 Shar-e-ray earthquake, shows that early warning system for earthquakes is possible in Tehran. Due to the tectonically dominant conditions of Tehran and its geographical demography in relation to faults distribution in Tehran, using early warning system with initial P wave is recommended.