. The Impact of the 2015 Taan Fjord Landslide on Tyndall Glacier

Abstract
The largest non-volcanic landslide recorded in North American history occurred on 17 October 2015 at Taan Fjord, the eastern arm of Icy Bay, Alaska. Southeast Alaska is an area of rapid glacier retreat and thinning with warming air temperatures, active tectonics, and rapid landscape evolution. The high angled slopes of Taan Fjord were previously supported by Tyndall glacier, but due to glacial recession, the mountainside became exposed, weakened, and dominantly influenced by gravitational forces. A large majority of the landslide mass was deposited into marine waters, and the remaining debris was either transferred to land across the fjord or collected on top the terminus of Tyndall glacier. In this work, we investigate the impact of the landslide on Tyndall glacier using optical and radar remote sensing techniques. Surface and glacier deformation will be analyzed for the years before the landslide using ALOS-1 data (L-band) and for the period following by constructing time-series from Sentinel-1A/B data (C-band), in conjunction with differencing of optical digital surface models (DSMs). Alterations to surface structures or the overall trend of appearance will be scrutinized using feature matching and tracking algorithms on Environment for Visualizing Images (ENVI) software and by generating disparity maps on the NASA Ames Stereo Pipeline (ASP) correlator.