The southern Orange Basin is structurally complex, with a tectonic history dating back to the Late Jurassic to Early Cretaceous. Mass movement events triggered by gravity and tectonic activities have resulted in the deposition of mass transport deposits (MTDs) on the seafloor. These MTDs have been documented as contributors to geohazards, posing risks to underwater infrastructure. Evidence of MTDs has been observed in 3D seismic surveys in the southern portion of the Orange Basin. However, limited studies have explored the geomorphological expression of MTDs using seismic attributes to delineate their shape, size, and anatomy in this region. The MTDs in the study area exhibit features such as basal shear surfaces (BSS), grooves, ramps, and striations. Four distinct mass transport packages were interpreted, primarily within the extensional regime, in the study area. These MTDs, spanning the Neogene to Coniacian periods, have thicknesses ranging from 300 m to 500 m. The MTDs are generally chaotic with semitransparent reflections. MTD D, being the largest, exhibits a maximum thickness of about 500 m and extends approximately 30 km in width.

You do not have access to this content, please speak to your institutional administrator if you feel you should have access.