SEISMIC HAZARD FUNCTION (SHF) STUDY PRIOR TO LARGE EARTHQUAKE EVENT ALONG OFF COAST OF SUMATRA ISLAND: SHF ANALYSIS BASED ON THE CHANGE OF THE B-VALUE

• Main Author: Billy Kurniawan, Joshua
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/85438
• Institution: Institut Teknologi Bandung

The seismic hazard function analysis around the off-coast of Sumatra Island is investigated based on the changes of the b-value using the shallow crustal earthquake catalog data. The study areas are analyzed around the large earthquake events that took place from 2000 to 2010. The change of the b-value is estimated using the maximum likelihood method with a constant number. First, the b-value surrounding the center area of interest with a radius of 150 km is calculated based on the earthquake catalog data from 1963 to 2016 (b50). Second, the b-value based on five years with a one-year moving window (b5) is estimated before the large earthquake event from 2000 to 2010. Furthermore, the SHF of b50 and b5 are calculated, and then they are compared. The results showed that the Probability of Exceedance (PE) of SHF b5 increased by at least about five years before the large earthquake events. Therefore, the results obtained in this study might be very beneficial for earthquake mitigation and modeling efforts for the possible potential of the earthquake hazard study and future analysis.