Chapter 29 - Application of NDSHA at regional and local scale in Iran

Abstract

Neo-deterministic seismic hazard assessment (NDSHA), which includes the physics-based earthquake simulation, has been applied to the Alborz region in the north of Iran. In addition, two validation tests of NDSHA at a local scale have been performed for Tehran city, which is located in Alborz. Results of NDSHA at a regional scale indicate high seismic hazard in the Alborz region, compared with the adjacent regions. The maximum range of the peak ground displacement, peak ground velocity, and design ground acceleration has been estimated 30–60cm, 30–60cm/s, and 0.6–1.2 g, respectively. The performed validation tests of NDSHA for Tehran city show that the hybrid technique (combing of modal summation and finite difference methods) can be implemented for the generation of the synthetic waveforms and then computation of the acceleration response spectra along the 2D sediment structure in Tehran. Results of a new validation test performed in this study show that the predicted peak ground acceleration (PGA) values from the simulated acceleration response spectra along the selected section are quite reliable. Therefore, the supposed geophysical parameters of the 2D sediment structure and 1D bedrock model presented in this study can be used to estimate PGA and spectral amplification from different earthquake scenarios of the active faults around Tehran.