| Popis: |
The Sunda Strait region is the riskiest area between Java and Sumatra. The impact of seismic activities must be considered to reduce disaster risk. This study has answered the lack of information about detailed seismotectonic conditions in the Sunda Strait. It confirms geotectonic actions controlled by the Asymmetry Subduction of the Sunda Arc between Oblique Subduction (Sumatra) and Frontal Subduction (Java). These activities produce five main seismotectonic zones based on their respective sources: Megathrust Seismotectonic Zones, Benioff Wadati Seismotectonic Zones, Sumatra Active Fault Seismotectonic Zones, Lampung Block Seismotectonic Zone and Center Part of Sunda Strait Seismotectonic Zone. Based on these seismic source zones, the Probabilistic Seismic Hazard Analyses (PSHA) of Sunda Strait have maximum Peak Ground Acceleration (PGA)=0.465 g, Pseudo Seismic Acceleration (PSA) Ss=0.2 second=1.114 g, PSA S1=1 second=0.465 g in Site Class SB at 7 % probability in 75 years (equivalent to a mean return of 1000 years), maximum Peak Ground Acceleration (PGA)=0.484 g, Pseudo Seismic Acceleration (PSA) Ss=0.2 second=1.159 g, PSA S1=1 second=0.484 g in Site Class SB at 2 % probability in 50 years (equivalent to a mean return of 2500 years), Peak Ground Acceleration (PGA)=0.499 g, Pseudo Seismic Acceleration (PSA) Ss=0.2 second=1.193 g, PSA S1=1 second=0.499 g, in Site Class SB at 2 % probability in 100 years (equivalent to a mean return of 5000 years). The results of this effort are expected to be used as the primary data for seismic risk assessment in the Sunda Strait and its surrounding area. |
