Application of Modified PSHA USGS Software in Java Island Bed Rock Peak Ground Acceleration and Hazard Curve with 2475 Years Return Period

Abstract

The use of seismic software, including in the analysis of Peak Ground Acceleration (PGA),
commonly using readily use one. Then again, the unafaidability of the development of Ground
Motion Prediction Equation (GMPE) every year must be accommodated as well. PSHA USGS
software is one of the ready use software, but unfortunately, this program was stopped developed
in 2014. This study emphasizes using the modified PSHA USGS software for bedrock PGA
analysis in Java Island within 2475 years of return period. The modified software means by
adding code to the HazSUBXnga fortran file, namely: GMPE BC Hydro 2016 for interslab
sources; Boore Atkinson 2014, Chiou Youngs 2014 and Campbel Bozorgnia 2014 for shallow
and fault background earthquakes. Data used in this study provided by the National Research
Center of Earthquake (Pusgen). The results obtained using this modified PSHA USGS are: (1)
the area near the fault has a higher PGA value, (2) Hazard curve for five big cities in Java
Island shows that Boore Atkinson 2014 and Chiou Young 2014 GMPE has a higher value than
2008 version ones in shallow background term. In the megathrust case, BCHydro 2016 shows
that its value surpasses the others. Last, in fault case, Chiou Young 2014 has the highest result of
PGA. In the future, it is expected that by knowing the renewal process of GMPE, the new GMPE
can be accommodated faster so that our dependence on other software can be reduced.