3D Subduction Interface Model for the Hikurangi Margin, New Zealand: Implications for Slow Slip Events

Abstract

Abstract We present a new 3D Hikurangi subduction interface model by using an implicit modeling approach that integrates seismic‐reflection profiles, relocated hypocenters, focal mechanism orientations, and tomographic interpretations. The model reveals along‐strike transitions in slow slip events (SSEs) that correlate with subduction interface geometry and megathrust curvature variations. The southern Hikurangi locked zone features a smooth, low‐curvature interface, contrasting with the rough, high‐curvature SSEs region to the north. We found well‐defined NE‐trending curvature bands in the north margin, which may be associated with the subduction of seamount chains formed during the rifting of the Hikurangi Plateau. The highest slips patches of cumulative SSEs (2002–2014) occur within an NE‐trending negative‐low‐curvature corridor, corresponding to a stress‐shadow and sediment lens formed in the wake of a subducted seamount chain, which may favor the occurrence of shallow SSEs and tremors.