Journal article
Fault slip-rates and Coulomb stress interactions in the intersection zone of the Hope, Kelly and Alpine Faults, South Island, New Zealand
JL Vermeer, MC Quigley, RM Langridge, BG Duffy, ZK Mildon, ML Diercks
Tectonophysics | Published : 2022
Abstract
Plate boundary faulting in New Zealand's South Island involves transfer of ∼50% of slip from the largest fault (Alpine Fault) onto the Hope-Kelly Fault system through a structurally complex fault intersection zone. The slip-rate contributions of faults within the Hope-Kelly system and possible role of static stresses in facilitating slip transfer are explored in this study. Lidar-based geomorphic and fault mapping combined with luminescence dating of fault-proximal sedimentary deposits constrain post-last glacial slip-rates on the Hope and Kelly faults. Dextral slip-rates on the central Hope Fault (12–15 mm/yr) decrease westward on the Taramakau section from 5.6 (+2.1/−0.7) mm/yr to 1.7 (+1...
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Awarded by California Department of Conservation
Funding Acknowledgements
JV acknowledges the support of a University of Melbourne Research Scholarship and the Baragwanath Trust. RML was funded through GNS Science research programs TSZ and ZLD 2.2.2 South Island Paleo- seismology. Lidar acquisition was funded by the New Zealand Earth- quake Commission through an Earthquake Commission Capability Fund grant to MQ, and Jarg Pettinga. Additional funding for this research was provided through an Australian Research Council Discovery Project Grant (#DP170103350) . ZM acknowledges NERC Studentship [NE/L501700/1], JSPS Fellowship PE 15776 and UKRI Future Leaders Fellowship [MR/T041994/1] for support to develop the Coulomb modelling approach. MD acknowledges University of Plymouth PhD studentship. Permits for sampling and fieldwork were provided by the Department of Conservation (DOC). We thank the property owners Ed and Michelle Evans for access to their properties and for lodging and logistical support. We thank Andrew Wilson, Santosh Dhakal, Naomi Leclere, Mindi Curran, and Hector Flores for field assistance. We thank Andrew Murray and Vicki Hansen (Nordic Laboratory for Luminescence Dating, Aarhus University and DTU Ris Campus in Denmark) for conducting luminescence dating of these samples and discussing their interpretation. We acknowledge the mana whenua of Ngati Waewae and Ngati Tahu as kaitiaki over Te Tai Poutini.