A megatsunami is a very large wave created by a large, sudden displacement of material into a body of water.
Lituya Bay is a fjord located on the coast of the south-east part of the U.S. state of Alaska. It is 14.5 km (9 mi) long and 3.2 km (2 mi) wide at its widest point. The bay was noted in 1786 by Jean-François de Lapérouse, who named it Port des Français. Twenty-one of his men perished in the tidal current in the bay.
Mount Saint Elias, the second-highest mountain in both Canada and the United States, stands on the Yukon and Alaska border about 26 miles (42 km) southwest of Mount Logan, the highest mountain in Canada. The Canadian side of Mount Saint Elias forms part of Kluane National Park and Reserve, while the U.S. side of the mountain is located within Wrangell-St. Elias National Park and Preserve.
Mount Fairweather, is the highest mountain in the Canadian province of British Columbia, with an elevation of 4,653 metres (15,266 ft). It is located 20 km (12 mi) east of the Pacific Ocean on the border of Alaska, United States and western British Columbia, Canada. Most of the mountain lies within Glacier Bay National Park and Preserve in the City and Borough of Yakutat, Alaska (USA), though the summit borders Tatshenshini-Alsek Provincial Park, British Columbia (Canada). It is also designated as Boundary Peak 164 or as US/Canada Boundary Point #164.
Glacier Bay National Park and Preserve is an American national park located in Southeast Alaska west of Juneau. President Calvin Coolidge proclaimed the area around Glacier Bay a national monument under the Antiquities Act on February 26, 1925. Subsequent to an expansion of the monument by President Jimmy Carter in 1978, the Alaska National Interest Lands Conservation Act (ANILCA) enlarged the national monument by 523,000 acres on December 2, 1980, and created Glacier Bay National Park and Preserve. The national preserve encompasses 58,406 acres of public land to the immediate northwest of the park, protecting a portion of the Alsek River with its fish and wildlife habitats, while allowing sport hunting.
Glacier Bay Basin in southeastern Alaska, in the United States, encompasses the Glacier Bay and surrounding mountains and glaciers, which was first proclaimed a U.S. National Monument on February 25, 1925, and which was later, on December 2, 1980, enlarged and designated as the Glacier Bay National Park and Preserve under the Alaska National Interest Lands Conservation Act, covering an area of 3,283,000 acres. In 1986, UNESCO declared an area of 57,000 acres within a World Biosphere Reserve. This is the largest UNESCO protected biosphere in the world. In 1992, UNESCO included this area as a part of a World Heritage site, extending over an area of 24,300,000-acre (98,000 km2) which also included the Wrangell-St. Elias National Park, Kluane National Park (Canada) and Tatshenshini-Alsek Park (Canada). Part of the National Park is also designated a Wilderness area covering 2,658,000 acres.
Margerie Glacier is a 21 mi (34 km) long tidewater glacier in Glacier Bay, Alaska, United States within the boundaries of Glacier Bay National Park and Preserve. The glacier begins on the southern slopes of Mount Root, elevation 12,860 feet (3,920 m), on the Alaska–Canada border flowing southeast down the valley, then turning to the northeast toward its terminus in Tarr Inlet. Margerie Glacier is one of the most active and frequently-visited glaciers in Glacier Bay, which was declared a National Monument in 1925, a National Park and Preserve in 1980, a UNESCO World Biosphere Reserve in 1986 and a World Heritage Site in 1992. While most of the tidewater glaciers in the park have been receding over the last several decades, Margerie Glacier has become stable, neither growing nor receding, while Johns Hopkins Glacier is advancing.
Grand Pacific Glacier is a 25 km (16 mi) long glacier in British Columbia and Alaska. It begins in Glacier Bay National Park in the St. Elias Mountains, 7 km (4.3 mi) southwest of Mount Hay, trends east into the Grand Pacific Pass area of British Columbia, and then southeast to the head of Tarr Inlet at Alaska-Canada boundary, 68 miles (109 km) west of Skagway.
Johns Hopkins Glacier is a 12-mile (19 km) long glacier located in Glacier Bay National Park and Preserve in the U.S. state of Alaska. It begins on the east slopes of Lituya Mountain and Mount Salisbury, and trends east to the head of Johns Hopkins Inlet, 1 mile (1.6 km) southwest of the terminus of Clark Glacier on Mount Abbe, and 79 miles (127 km) northwest of Hoonah. It was named after Johns Hopkins University in Baltimore, Maryland in 1893 by Harry Fielding Reid. It is one of the few advancing tidewater glaciers of the Fairweather Range. Access to the face of the glacier is limited to the Johns Hopkins Inlet.
Lituya Glacier is a tidewater glacier in the U.S. state of Alaska. Located at 58°43′25″N137°29′33″W inside Glacier Bay National Park and Preserve, its source is in the Fairweather Range and it feeds into Lituya Bay on the gulf coast of Southeast Alaska.
Mount Crillon is a high peak of the Fairweather Range, the southernmost part of the Saint Elias Mountains. It lies southeast of Mount Fairweather, in the promontory between the Gulf of Alaska and Glacier Bay. It is included in Glacier Bay National Park. The peak was named after Felix-Francois-Dorothee de Bretton, Comte de Crillon, by his friend, the French explorer Jean Francois de Galaup de la Perouse.
Mount Salisbury is a peak in the Fairweather Range of Alaska, 6 miles (10 km) southeast of Mount Fairweather. Its east slopes feed one of the northern branches of the Johns Hopkins Glacier, which flows into Glacier Bay. On its western side is a large cirque, shared with Mount Fairweather, Mount Quincy Adams, and Lituya Mountain, which heads the Fairweather Glacier; this flows almost to the Pacific coast at Cape Fairweather.
Mount Steller is a peak at the far eastern end of the Chugach Mountains of Alaska, United States. It is notable for its isolated location among extensive icefields, and for its large rise above local terrain. For example, it rises 8000 feet above the Bering Glacier to the south in about 4 horizontal miles (6.4 km).
Icy Bay is a body of water in the borough of Yakutat, Alaska, formed in the last 100 years by the rapid retreat of the Guyot, Yahtse, and Tyndall Glaciers. It is part of the Wrangell-Saint Elias Wilderness.
The 1958 Lituya Bay earthquake occurred on PST with a moment magnitude of 7.8 to 8.3 and a maximum Mercalli intensity of XI (Extreme). The strike-slip earthquake took place on the Fairweather Fault and triggered a rockslide of 30 million cubic meters and about 90 million tons into the narrow inlet of Lituya Bay, Alaska. The impact was heard 80 kilometers (50 mi) away, and the sudden displacement of water resulted in a megatsunami that washed out trees to a maximum elevation of 524 meters at the entrance of Gilbert Inlet. This is the largest and most significant megatsunami in modern times; it forced a re-evaluation of large-wave events and the recognition of impact events, rockfalls, and landslides as causes of very large waves.
The Gareloi Volcano is a stratovolcano in the Aleutian Islands of Alaska, United States, about 1,259 miles (2,026 km) from Anchorage. Gareloi is located on Gareloi Island, and comprises most of its land mass. The island also has two small glaciers which protrude to the northwest and southeast.
Mount Abbe is an 8200+ feet double summit mountain located in the Fairweather Range of the Saint Elias Mountains, in southeast Alaska. The peak is situated near the terminus of the Johns Hopkins Glacier, within Glacier Bay National Park and Preserve, 100 mi (161 km) northwest of Juneau, and 8.2 mi (13 km) northeast of Mount Orville. Although modest in elevation, relief is significant since the mountain rises up from tidewater in less than two miles. Mount Abbe is often seen and photographed with the Johns Hopkins Glacier, which is a popular destination for cruise ships. The mountain was named in 1936 by William Osgood Field and William Skinner Cooper, of the American Geographical Society, for Cleveland Abbe Jr., (1872-1934), an American geographer. Abbe received a Ph.D. in 1898 from Johns Hopkins University. The Gilman Glacier and Clark Glacier on the mountain's slopes were named for Daniel Coit Gilman, the institution's first president, and William Bullock Clark who was a professor of geology at the university. The mountain's name was officially adopted in 1937 by the United States Geological Survey. The first ascent of the south summit was made June 11, 1977, by Jim Wickwire and Dusan Jagersky via the Southeast Face. Three days later, Dusan Jagersky was tragically killed while descending an unnamed peak. The first ascent of the north summit was made July 14, 1991, by Walter Gove and William Pilling. The months May through June offer the most favorable weather for climbing Mount Abbe, but it's a challenging climb in any conditions, with few attempts.
Mount La Perouse is a 10,728-foot glaciated mountain summit located in the Fairweather Range of the Saint Elias Mountains, in southeast Alaska, United States. The peak is situated in Glacier Bay National Park, 4 mi (6 km) southeast of Mount Dagelet, 7.6 mi (12 km) south-southeast of Mount Crillon which is the nearest higher peak, and 28.6 mi (46 km) southeast of Mount Fairweather, which is the highest peak in the Fairweather Range. Topographic relief is significant as the mountain rises up from tidewater in less than nine miles. The mountain was named in 1874 by William Healey Dall of the U.S. Geological Survey, for Jean-François de Galaup, comte de Lapérouse (1741-1788), a French navigator who explored this coastal area in 1786. The first ascent of the peak was made in 1953 by USGS party consisting of James Seitz, Karl Stauffer, Rowland Tabor, Rolland Reid, and Paul Bowen. On February 16, 2014, a colossal 68 million ton landslide broke free from the flanks of Mt. La Perouse and flowed nearly 4.6 miles from where it originated. The months May through June offer the most favorable weather for climbing and viewing.
Tyndall Glacier is a valley/tidewater glacier in the U.S. state of Alaska. The glacier lies immediately west of 141° West longitude, within the boundaries of the Wrangell–Saint Elias Wilderness, itself part of Wrangell–St. Elias National Park & Preserve, in the borough of Yakutat.
