GSNZ Bay of Plenty branch presents the 2023 Hochstetter lecture
Kaikōura Earthquake – Tales from the seafloor, presented by Lorna Strachan
In November 2016, a magnitude 7.8 Earthquake dramatically struck the coastal region of Kaikōura, indelibly impacting the residents of the region, changing the very shape of the coast and land, and generating a devastating tsunami. But what happened offshore? Did the seafloor respond in a similarly dramatic fashion? What are the effects 6 years later and how can we use the earthquake triggered deposits to understand past and future hazards?
In this talk, I will use exceptional novel seafloor data and state of the art techniques to show the devastation wrought on the seafloor by the Kaikōura Earthquake. I will use the sedimentary deposits that resulted from the Earthquake to build a narrative of the physical and biogenic processes in the minutes, hours, and years following the Earthquake. I will reflect on how we can use these exceptionally “geologically young” deposits to unravel past cataclysmic natural hazards to help us better understand the interconnections between the land, people, and ocean floor in the future.