Summary
The objective of this NSF Rapid Response Research (RAPID) grant is to document and quantify the impacts of an extraordinary landslide-generated mega-tsunami that occurred on August 10, 2025, when an estimated ~65 million m³ of a mountainside collapsed into Tracy Arm, a fjord in southeast Alaska. Preliminary satellite and Digital Elevation Model (DEM) analyses suggest near-field runup of ~470–500 m, potentially the second-largest tsunami ever observed, creating an urgent need for ground-truth measurements before winter snow, freeze–thaw processes, and vegetation obscure or destroy fragile high-
