A Study on Microzonation of Sejong City Area by Site Amplification Caused by Gyeongju Type Earthquake

Abstract

When an earthquake occurs, ground amplification is caused by the soil. For the same earthquake, the magnitude of ground vibration experienced by buildings varies depending on the ground conditions. In this study, ground response analysis was performed for 120 locations in Sejong City, using Gyeongju earthquake waves, which reflect the characteristics of possible seismic waves in Korea. By creating a map using the Peak Ground Accelation (PGA) that the structure will experience and the ground natural period for each location, a map of the building type (building layer) that is likely to be earthquake-prone was determined based on the double resonance phenomenon, and the seismic hazard in the target area was assessed. The microzonation map based on the characteristics of these ground amplifications could be used for selecting the priority for inspection or the priority for anti-seismic reinforcement in the event of an earthquake.