Journal article

Structure and kinematics of active faulting in the Hope-Kelly and Alpine Fault intersection zone, South Island, New Zealand

Jessie L Vermeer, Mark C Quigley, Brendan G Duffy, Robert M Langridge, Jarg R Pettinga

TECTONOPHYSICS | ELSEVIER | Published : 2021

Abstract

Using lidar, photogrammetry and field studies, we investigate the structure and kinematics of the Hope, Kelly, and Alpine faults where they converge and intersect along the Australian-Pacific plate boundary in New Zealand. Approximately 50% of the reverse-dextral slip rate of the Alpine fault in the west transfers to the dextral central Hope Fault in the east via a horsetail splay zone of distributed oblique dextral-normal shear forming the Hope-Kelly fault system. The westernmost portion of the Hope fault is misoriented for dextral slip and is likely an extensional fault that accommodates the Alpine fault slip rate change across the intersection zone. As it transitions to an extensional fau..

View full abstract

Grants

Awarded by Australian Research Council


Funding Acknowledgements

We thank the New Zealand Earthquake Commission for funding the lidar acquisition component of this research through an Earthquake Commission Capability Fund grant to JRP and MQ. RML was funded through GNS Science research projects TSZ and ZLD 2.2.2 South Island Paleoseismology, and the Alpine fault lidar acquisition was funded by the Natural Hazards Research Platform (NHRP). JV acknowledges the support of a University of Melbourne International Research Scholarship and the Baragwanath Trust. Additional funding for this research was provided through an Australian Research Council Discovery Project Grant (#DP170103350). Permits for sampling and field work were provided by the Department of Conservation (DOC). Seequent generously provided access to the Leapfrog Geo (c) software. 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 Eric Cowgill and an anonymous reviewer for their extensive and constructive reviews that helped us substantially improve the manuscript. We acknowledge Kati Wairaki and Ngai Tahu as first peoples of Noti Taramakau and Ka Tiritiri-o-te-moana.