Co-Seismic Landslides and Reactivations

Luis Angel Guerrero Hoyos, Daniel Acosta Reyes, and Nishanthi Perera, Civil and Environmental Engineering Geotechnical Group

On 14 November 2016, the region surrounding Kaikoura, New Zealand, experienced a M7.8 earthquake which triggered over 10,000 landslides. The modes of landsliding were diverse, including shallow, soil slides; rock avalanches and rock falls; and massive, deep-seated rotational slumps (Massey et al., 2018). Extensive mapping of the landslides triggered by the November 2016 earthquake has been undertaken by the New Zealand Institute of Geological and Nuclear Sciences (GNS) and Hakan Tanyas and coauthors (2022) who developed their own landslides inventory publicly available. Over the years, the GNS has performed LiDAR and UAV - SfM surveys in the area that have served as the main dataset to develop the project. The main goal is to track ground changes after the coseismic landslides, see how they've progressed over time, and find geospatial correlations between ground changes. This study is focused on the LIDAR dataset collected by GNS between 2016 and 2018 and use the difference maps technique to identify the potential movements.