Abstract
This paper presents the development of synthetic ground motion at specific sites in Yogyakarta town. In the 2019 Indonesian Seismic Code [1] provides an alternative method in the analysis of building structures by applying the dynamic time history analysis. At least 11-pairs of earthquake recordings must be used in the analysis. Synthetic ground motion utilizing the Method of Probability Seismic Hazard Analysis (PSHA) was used in this study. A selected site in Yogyakarta town was chosen as a pilot study considering that there were many fatalities and building damage caused by the 2006 Yogyakarta earthquake. The Uniform Hazard Spectra (UHS) based on the shallow crustal earthquake source is higher than the Megathrust. The risk targeted spectrum demand MCEr has been considered, which on average 12.3% greater than the UHS. The synthetic ground motions (SGM) are accordingly based on the shallow crustal earthquakes. The dominant magnitude and distance are MD = 6.5 and RD = 14.5 km. They show that the contribution of the Opak River fault to the hazard in Yogyakarta town is very dominant because the distance is very close. Based on the obtained MD and RD, spectral matching, and testing significant duration D595, the 12-synthetic ground motions were successfully developed.
Highlights
Indonesia is one of the earthquakes (EQ) prone countries in the world, including in the Yogyakarta Special Province (YSP)
In addition to the Megathrust earthquake, in the mechanism confirms with the results study, as reported by YSP area was shaken by the M7.2 and the M8.1 Benioff earthquake
The results were obtained because the Opak river fault as a shallow earthquake source is very close to the city of Yogyakarta, while the Megathrust earthquake epicenter as graphically presented in Fig. 2 occurs very far from the city of Yogyakarta
Summary
Indonesia is one of the earthquakes (EQ) prone countries in the world, including in the Yogyakarta Special Province (YSP). As stated by Pawirodikromo [2], there is no significant strong-motion record network in Indonesia, so the availability of ground motion time series is still a big problem. If the Performance-Based Seismic Design (PBSD) is used, a large number of ground-motion time series are required [7], similar as needed in the 2019 Indonesian Seismic Loading Code. The reliable availability of earthquake time series for site analysis or structural response is one of the biggest and complex problems in earthquake engineering. It happens because many earthquake source variables included, and many site uncertainties occur [8]
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