The Sensitivity of Attenuation Impact to Bedrock PGA based on PSHA Analysis, case study: Yogyakarta Special Region, Indonesia Arifan Jaya Syahbana (a*,b,c), Khori Sugianti (c), Masyhur Irsyam (b,d), Hendriyawan (b,d), M Asrurifak (e)
a) Department of Civil Engineering, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Bandung, Indonesia
* arifanjaya[at]s.itb.ac.id
b) Center for Earthquake Science and Technologi Indonesia, Bandung, Indonesia
c) Research Center for Geotechnology, Indonesian Institute of Sciences, Bandung, Indonesia
d) Department of Ocean Engineering, Faculty of Civil and Environmental Engineering, Institut Teknologi Bandung, Bandung, Indonesia
e) Research Center for Disaster Mitigation, Institut Teknologi Bandung, Bandung, Indonesia
Abstract
Special Region of Yogyakarta is one of a big cities in Indonesia which has important meaning from the political, social, economic and cultural aspect. This area is located in a high earthquake hazard zone based on the 2017 Earthquake Hazard Map. This location also mentioned has accelerated bedrock acceleration up to 0.6g. In this study, a re-analysis of PSHA will be carried out using the OpenQuake software with the GEM database and the latest attenuation to see the number of acceleration differences generated in the bedrock. Simulation is done by making two logic tree attenuation scenarios, later called the Pusgen scenario (1) and the Cummins scenario (2). The result of this study is the first scenario will result in an acceleration greater than the second scenario. Bedrock PGA based on Pusgen scenario range from 0.431-0.720g in another hand Cummins scenarios ranges from 0.405 to 0.709g.
