مخاطرات محیط طبیعی (Dec 2018)
Earthquake hazard assessment in Assalouyeh area based on NGA seismicity model
Abstract
Earthquakes are presented as the most dangerous geological phenomenon which is causing many damages to cities, infrastructures, buildings, etc. Researchers have been extremely dynamic in assessing and predicting the earthquake events and have made noteworthy advances, but still, face many uncertainties. Along these lines, the best approach in this field studies the logical patterns and parameters involved and the interaction between earthquakes and urban construction or seismic retrofitting. In order to implement a seismic resistant structure, the first step is to have sufficient knowledge on seismicity and earthquake hazard analysis of the area in which for estimating and analyzing the sites seismic parameters, many empirical and computer-based approaches have been presented. In this regard, the computer-based methods (simulations) due to their high accuracy and computational power nowadays are getting more attention and application. One of the newest approaches for identification of different regions seismicity is using the next-generation ground motion analysis (NGA) models. This model by defining attenuation relations for the study area can estimate the seismicity parametrical coefficients with high accuracy. This advantage can help to describe the geological and seismotectonic structures of different regions to observe the impact of seismic parameters. In this study, the NGA model for the Assalouyeh area based on geological and tectonically conditions are prepared and engineering parameters for seismic design are estimated locally and the seismic zoning map of the region is provided. According to the NGA model results for Assalouyeh region within 100 km radius, the PGA, PGD, PGD and PSA parameters for the 100-year return period are estimated as 0.29g, 18.2cm/sec, 24.2 cm and 0.19g respectively. Based on the results of this research, the study area is divided into four zones in terms of risk potential degree and Assaluyeh is located in high earthquake risk potential one.
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