Model Respons Seismik Tanah di Kecamatan Selebar Akibat Perambatan Gelombang Gempa Satu Dimensi

Abstract

This study was conducted to determine the response of soil layers due to earthquake wave propagation in Selebar District, Bengkulu City. This study began with field investigations at six points. Seismic response analysis was built using a one-dimensional wave propagation model with linear and non-linear equivalent methods. The 2007 Bengkulu-Mentawai earthquake wave was applied as the input wave. This study compares PGA, spectral response acceleration, and amplification factors produced by the two methods. The PGA value created by the linear equivalent method is approximately 5%-30 % greater than the non-linear method. The amplification factor produced by the linear equivalent method experiences a greater amplification of roughly 3%-30 % than the non-linear method. Spectral acceleration has generally exceeded the seismic design applicable in the short period, with a value of 1.2g - 2.1g for the linear equivalent method and 1.1g - 1.6g for the non-linear method. Therefore, updating the seismic design for building planning in the Selebar District, Bengkulu City, is necessary.