Asymmetric Brittle Deformation at the Pāpaku Fault, Hikurangi Subduction Margin, NZ, IODP Expedition 375

Quantifying fault damage zones provides a window into stress distribution and rheology around faults. International Ocean Discovery Program (IODP) Expeditions 372/375 drilled an active thrust splay within the Hikurangi subduction margin. The fault, which is hosted in Pleistocene clastic sediments, surrounded by brittle fractures faults as well ductile deformation features. We find that fracture density zone enveloping asymmetric, with hanging wall showing greater overall at distances from than footwall. Furthermore, peak occurs area of mesoscale folding localized slip rather adjacent to main zone. attribute asymmetry disparate histories between footwall, and/or dynamic propagating rupture. Damage common shallow depths influences mechanical hydrological properties such channelized fluid flow stability. Finally, we demonstrate show similar damage-displacement scaling continental