Uninhabited Augustine Island in Cook Inlet, formed by the active Augustine Volcano, has a nearly symmetrical central summit with an elevation of 1,260 m (4,134 ft). Ash from the last major eruption in 1986 reached Anchorage, about 290 km (180 mi) to the northeast. A major eruption in 1883 caused a 9 m (30 ft) tsunami that reached the village of Nanwalek. Debris avalanches and landslides are the likely origins of Augustine’s hummocky coastal topography around Burr Point. The 1883 debris avalanche buried the former shoreline of Augustine Island and displaced the new shoreline 2 km seaward at Burr Point. Bathymetry indicates the 1883 debris avalanche traveled an additional 3 km northward beneath the sea. Most of the material is comprised of angular fragments of cobbles to boulders but clasts as large as 4 to 8 m (10 to 25 ft) were also found. Learn more about Mount Augustine here. Click here to download the CoastView app and explore Burr Point and Augustine Island.