from frontal subduction of the Indo-Australian plate along Java to oblique subduction along
Sumatra. This obliquity gives rise to the Sumatra fault zone that links the accretionary zone
of the Andaman Sea to the Sunda Strait. Previous studies have shown a decrease of
displacement rate of the movement along the fault zone from north to south. Consequently, it
has been proposed that the area between the subduction zone and the fault zone—ie, the …