A new approach to structural seismic responses in Mataram City: Based on the Probabilistic Seismic Hazard Analysis (PSHA) results obtained after Lombok earthquakes 2018

In the last few years, several major earthquakes in Indonesia have provided enough reasons for updating the existing building seismic resistance code. SNI 1726-2019 is the latest Indonesia seismic code. However, the variation of Probabilistic Seismic Hazard Analysis (PSHA) results due to the 2018 Lombok Earthquake has been disregarded in this code because it adopts the 2017 seismic maps from National Center for Earthquakes Studies. This study investigated spectral acceleration parameters according to previous seismic codes (SNI 1976-2012) and current seismic codes (SNI 1976-2019) as well as the PSHA results obtained after the Lombok earthquakes in 2018. Spectral accelerations were applied to a building structure located in Mataram City to analyze the seismic building responses. The results indicate that seismic parameters of PSHA result associated with Lombok earthquakes yield structures of higher seismic demand than SNI 1726-2012 or SNI 1726-2019 codes, especially for structures located in medium soil type. The current code needs to be improved immediately to promote resilience and resistance against earthquakes in this area.