Pengembangan Peta Percepatan Gerakan Tanah Puncak Kota Semarang Berdasarkan Peraturan Gempa Tahun 2019

Abstract

Surface peak ground acceleration (PGA_M) needs for seismic forces of basement and retaining structures design.  The PGA_M value can be calculated using bedrock peak ground acceleration (MCE_G) and multiplied it with site coefficient F_PGA. For building design purposes, the MCE_G value can be calculated based on the combination of DSHA (Deterministic Seismic Hazard Analysis) and PSHA (Probabilistic Seismic Hazard Analysis). Compared to the previous 2012 website response spectrum design which is displayed the PGA_M value, only MCE_G value at site position can be obtained from the new 2021 response spectrum design website. This paper describes the development of PGA_M distribution of Semarang using Visual Basic programming language software. The distribution of DSHA and PSHA (2500 return periods) combination analysis for developing MCE_G value also describes in this paper. The analysis was performed based on the earthquake record data from 1900 to 2016. The PGA_M analysis was performed at 203 soil boring investigation positions and using F_PGA site coefficients of SNI 1726:2019. The minimum and maximum PGA_M distribution values at the study area are in between 0.45 through 0.55 g and the maximum PGA_M is distributed at the northern part of the study area.