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Along the northeast coast of New Zealand’s South Island, a 7.8 Mw earthquake on the 14th of November 2016 induced instantaneous uplift of approximately 1 m around the Kaikōura Peninsula. This paper documents a unique field study examining short-term responses in the Mixed Sand and Gravel (MSG) beaches of Kaikōura to a relative sea level fall as a result of this event. We present two conceptual response pathway models which consider the pre-earthquake trends of 18 coastal sites, and two surveys taken over a 22 month period following the earthquake to define the short-term response of MSG beaches to instantaneous relative sea level fall. This study found MSG beach responses vary strongly according to their pre-quake sediment supply, source connectivity and open coast exposure characteristics. Overall, there were two predominant trends in which the beaches were responding in the short-term post-earthquake environment: accretionary proles and erosional proles. The dierence between these two prole response types can be summarised as pre-earthquake erosional proles were found to be retreating to pre-earthquake extents 22 months post-earthquake, whilst pre-earthquake accretional and dynamic beaches had an increased or stable trend which promoted stability or growth in beach volume post relative sea level fall.

Geomorphic responses of uplifted mixed sand and gravel beaches: combining short-term observations from Kaikōura, New Zealand with longer-term evidence