The interesting point of this article, which has been presented at INDONESIAN PETROLEUM ASSOCIATION 35th Annual Convention and Exhibition May 2011 is that the deep seismic reflection data acquired by Western Geco and CGGVeritas have provide new information for understanding the evolution Sumatran forearc basins.
This article has been published in Nature Geoscience, 2011 . The authors have identified a seamount 3–4 km high and 40 km wide that has been subducted to a depth of 30–40 km below the Sumatra forearc mantle. The seamount has remained intact despite more than 160 km of subduction, and that there is no seismic activity either above or below the seamount. The authors suggest that the subduction of a topographic feature such as a seamount could lead to the segmentation of the subduction zone.
This article notes the structural features in the Mentawai forearc that can be interpreted as products of compression of the accretionary wedge and forearc basin sediments. Compressional phases since the Late Miocene initiated (a) the landward vergent foldthrust belt in the Mentawai Fault Zone (MFZ), (b) reactivation of seaward vergent imbricated thrusts in the retro-accretionary wedge, and (c) uplift of the accretionary wedge and some parts of the forearc basin. The authors interpret that the northwest part of the accretionary wedge underwent higher compression and tilting. The compression of the forearc is suggested to be controlled by the combination of the geometry and position of the continental backstop, and the subducting bathymetric high in the oceanic plate.
This article presents the interpretation of newly acquired high-quality industry-standard deep seismic reflection and swath bathymetry data to provide insight into the structural style and evolution of the Mentawai Fault Zone (MFZ). The structural style, lateral distribution and kinematics of the fault zone has been discussed related the development of forearc high thrusts and accretionary wedge mechanics. The implication of this fault zone to the coseismic rupture during slip of the megathrust is also discussed.