Arias intensity zoning and the effect of Quaternary sediments on its changes, a case study: Khuy Range

Javadi Dogaha, Mohammad Reza; Akashe, Bahram; Pourkarmani, Mohsen; Ghaitanchi, Mohammad Reza; Dorostian, Arezo

doi:10.22034/irqua.2021.702408

Arias intensity zoning and the effect of Quaternary sediments on its changes, a case study: Khuy Range

Document Type : Original Article

Authors

Mohammad Reza Javadi Dogaha ¹

Bahram Akashe ²

Mohsen Pourkarmani ²

Mohammad Reza Ghaitanchi ³

Arezo Dorostian ¹

¹ Faculty of Geophysics, Islamic Azad University, North Tehran Branch, Tehran, Iran

² Faculty of Earth Sciences, Islamic Azad University, North Tehran Branch, Tehran, Iran

³ Institute of Geophysics, University of Tehran, Tehran, Iran

https://doi.org/10.22034/irqua.2021.702408

Abstract

Earthquake is one of the natural hazards that has caused many casualties and financial losses all over the world over the years. This is the reason why earthquake risk analysis should be studied more seriously. Iran is located in one of the seismic regions of the world, the Himalaya-Alps belt, where many earthquakes occur every year. Arias intensity function, as one of the important earthquake parameters, helps in seismic risk analysis and can be used to estimate structure performance, slope stability, and liquefaction during earthquakes. In this study, along with the tectonic and seismological analysis of Khoi area in the northwest of Iran, earthquake intensity zoning was done based on the Arias method. Numerical values of Arias intensity for return periods of 475, 975 and 2475 years were prepared in the form of equipotential maps. In the analysis, the effect of Quaternary sediment changes was also considered. Quite evidently, earthquake intensity is affected by changes in shear wave velocity, apart from distance from the fault; In such a way that with the distance from the seismic source, in areas with high thickness of Quaternary sediments, it even increases. This issue tells the effect of geological conditions in the estimation of parameters related to earthquakes.

Keywords

Arias intensity

earthquake

return period

shear wave speed

seismic spring