• Fault rock microstructures reveal slow-to-fast slip on an active detachment fault that dips 15-24° at the Earth's surface • Pseudotachylites, foliated cataclasites, and ultracataclasites developed in a zone of mixed mode, seismic-to-aseismic slip behavior • Frictionally weak saponite in fault gouge promotes slip on the most poorly oriented, surficial part (<24°) of the Mai'iu fault Accepted Article This article has been accepted for publication and undergone full peer review but has not been through the copyediting, typesetting, pagination and proofreading process, which may lead to differences between this version and the Version of Record. Please cite this article as

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