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AAPG Asia Pacific Presents Dr. Lorna J Strachan, University of Auckland, New Zealand
A 60-90 minute talk entitled "Understanding Contemporary Sedimentary Processes of the Deep-marine Hikurangi Channel, New Zealand: A Modern Analogue for Sub-surface Convergent". Talks are free of charge. Talk Summary: "Off the east coast of New Zealand lies one of Earth’s longest and most enigmatic deep-sea channels, the colossal c.2000 km long Hikurangi Channel. Unlike submarine channels of a similar size, it is located along the convergent Hikurangi Subduction Margin. The Kaikōura Mw 7.8 2016 earthquake, revealed significant sediment flushing of multiple canyons and generation of a co-seismic turbidity current. Here I will use shallow sediment cores from the Hikurangi Channel to demonstrate a staggering array of Holocene gravity flow processes. I will highlight longitudinal and lateral deposit variability for 600 km that reveals insights into turbidity current flow structure, and vertical and longitudinal stratification. These observations will be placed in a temporal context using 14C radiocarbon and tephra-stratigraphy ages. These results will provide a useful insight into the spatial variability of an active channel system that can be easily translated to subsurface analogues.".

Feb 4, 2021 11:00 AM in Singapore

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Speakers

Dr Lorna J Strachan
Senior Lecturer @University of Auckland
Lorna is a Senior Lecturer of Sedimentology whose research focuses on understanding the physical processes that redistribute sediment in the deepest depths of the ocean. She is a researcher in the fields of turbidity currents and soft-sediment deformation, where she focusses on using deposits to understand flow process dynamics. She has conducted research into understanding submarine slope dynamics and processes from tectonically active and passive margins around the world. Her research is multi-disciplinary integrating modern seafloor bathymetry and core data, with ancient outcrop and seismic data. To date, Lorna has supervised more than 60 post-graduate student projects.