Fore-arc high and basin evolution offshore northern Sumatra using high-resolution marine geophysical datasets (original) (raw)

Journal of Asian Earth Sciences, 2021

Abstract

We present a morphotectonic study of the offshore northern Sumatra fore-arc high and fore-arc basin and an evolutionary model of the area based on high-resolution marine geophysical datasets. We show that the landward slope of the fore-arc high and the western edge of the Aceh fore-arc basin host a set of deeply-rooted, seaward-dipping backthrusts: main backthrust (MBT) and frontal backthrust (FBT), which we call north Sumatra backthrust system (NSBS). The FBT is imaged reaching the seafloor throughout the study area, whereas the MBT is imaged as a blind fault. Many landward-dipping imbricated thrusts (fore-arc high thrusts-FHT) are also observed below the fore-arc high, which along with the system of backthrusts have been responsible for uplifting the fore-arc high, shortening the Aceh Basin. On the landward slope of the fore-arc high, a strike-slip fault zone is imaged (termed West Andaman Fault - WAF - in accordance with previous studies), is readily interpreted as the product of...

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