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Rockfalls and rockslides during the past 12 000 years have depositedbouldery debris cones on the seafloor beneath massive rock slopes throughoutthe inner part of Knight Inlet. The 885 m high rock slope, located acrossfrom a former First Nations village destroyed in the late 1500s by aslide-induced wave, exposes the contact between a Late Cretaceous dioriticpluton and metamorphic rocks of the Upper Triassic Karmutsen Formation. Thepluton margin is strongly foliated parallel to primary and secondary fabricsin the metamorphic rocks, resulting in highly persistent brittle structures.Other important structures include a set of sheeting joints and highlypersistent mafic dykes and faults. Stability analysis indicates that planarand wedge rock slope failures up to about 500 000 m<sup>3</sup> in volumecould occur. We suspect that failures of this size in this setting would havethe potential to generate locally hazardous waves. As several similar rockslopes fronted by large submarine debris cones exist in the inner part ofKnight Inlet, it is clear that tsunami hazards should be considered incoastal infrastructure development and land-use planning in this area

Structure, stability, and tsunami hazard associated with a rock slope in Knight Inlet, British Columbia