| Summary: | Have been done many researcher concern prediction of seismic hazard in
Indonesia, but eastern Indonesia, especially the Moluccas islands is still needed
further assessment. This research was purposed to determine seismic hazard based on
peak ground acceleration distribution. Probabilistic seismic hazard analysis method
was used program PSHA 2007 from USGS developed by Stephen Harmsen, and have
been modified by Bella in 2008.
The result of this calculated obtained distribution hazard value in PGA condition
(T=0.0 second) for return period of 500 years at the base rock with peak ground
acceleration value ranging between 0.20 g - 4.0 g and for return period of 2500 years
obtained peak ground acceleration value ranging between 0.40 g - 4.0 g. While for
hazard value in base rock in spectral condition T = 0.2 second for return period of
500 years and 2500 years with peak ground acceleration value ranging between 0.2 g
-0.4 g and 0.4 g - 4.0 g. For hazard value for base rock in spectral condition T=1.0
second for return value of 500 years and 2500 years with peak ground acceleration
value ranging between 0.2 g - 2.4 g and 0.2 g - 2.6 g.
Peak ground acceleration distribution result varied because according to the
characteristics of each earthquake source zone. The result can be seen that Maluku
islands, including areas that are unstable or in other words, areas with determine highseismic
hazard. The peak ground acceleration values are affected by the earthquake
data are complete, the characteristics of the earthquake, the earthquake source
parameters, attenuation functions and geological research areas include the order of
tectonic plates and others.
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