The 28 November 2020 Landslide, Tsunami, and Outburst Flood – A Hazard Cascade Associated With Rapid Deglaciation at Elliot Creek, British Columbia, Canada

We describe and model the evolution of a recent landslide, tsunami, outburst flood sediment plume in southern Coast Mountains, British Columbia, Canada. On 28 November 2020, about 18 million m3 rock descended 1000 m from steep valley wall traveled across toe glacier before entering 0.6 km2 lake producing >100-m high run up. Water overtopped outlet scoured 10-km long channel depositing debris on 2 fan below outlet. Floodwater, organic debris, fine entered fjord where it produced 60+km altered turbidity, water temperature, chemistry for weeks. The destroyed forest salmon spawning habitat. Physically based models provide real-time simulations event can improve understanding similar hazard cascades risk they pose.