The earthquake occurred along this fault, triggering a rockfall from the mountains. I'm a freelance geologist working mostly in the Eastern Alps. In recent years, there has been a spate of large landslides in GBNPP that corresponded to record-breaking warm temperatures in Alaska. Glacier Bay and its inlets are a popular destination for cruise ships and passenger boats; about 540,000 people visited Glacier Bay National Park and Preserve (GBNPP) in 2017. The boat was carried by the wave above the trees and luckily washed back into the bay, both Howard Ulrich and his son survived. © 2020 Forbes Media LLC. 4 Gigantic waves will catch the intruder, transforming it into a bear, common animals in the Alaskan wilderness. The seven miles long and two miles narrow Lituya Bay was protected from waves by two promontories, separating it from the open sea, and a popular fishing spot for locals at the time. Juli 1958 verursachte ein Erdbeben einen Erdrutsch am östlichen Ende (landeinwärts gelegen), bei dem 90 Millionen Tonnen Gestein und Eis in die Bucht stürzten. All Rights Reserved, This is a BETA experience. Lituya Bay, on the west side of the park (part of Glacier Bay National Monument in 1958), has experienced at least 3 tsunamis, the largest occurring in 1958 from an M7.8 earthquake on the Fairweather fault that triggered a rockslide. Although there have been at least 90 M>4 earthquakes within 100 kilometers of Glacier Bay since 1958, none have been large or close enough to trigger landslides in the Park. Areas with the most potential for landslides entering the water (where they could possibly generate waves that could affect boats) are the Johns Hopkins, Tarr, Rendu, and Tidal Bay Inlets. 2018; Higman et al. Existing digital data on landslide occurrence are held by a range of Federal, State, and local government agencies, and no central point of access has previously been available. Yellow dots show how high the tsunami reached above water level (runup) in meters. The results indicate that Landslide A has shown little to no movement, with less than an inch of change. Mega-tsunami hundreds of metres tall feared if Alaskan glacier disappears ... creating a tsunami wave potentially hundreds of metres high. Diese enorme Menge hatte einen Megatsunami zur Folge. In addition, the National Weather Service National Tsunami Warning Center is working to put a tsunami warning system in place. On July 9, 1958, an earthquake with an estimated magnitude of 7.7-8.3 triggered an enormous rockfall in a remote bay along the Gulf of Alaska. Since 1853 at least four or five similar events are documented. Estimated 40 million cubic yards of rock fell for 3,000 feet hitting the Lituya Glacier. AN UNPRECEDENTED 'mega-tsunami' could be caused by a melting Alaska glacier, scientists have warned. An interesting find emerged during the study—Bathymetry data used during the research revealed a previously hidden landslide at the junction of Johns Hopkins and Tarr inlets that appears to have occurred sometime after 1892 when glaciers withdrew from the area. Zwei dieser Stürze werden von Arbeitsgruppen untersucht, mit denen Dr. Anja Dufresne vom Institut für Ingenieurgeologie zusammenarbeitet. Geological evidence, historical observations, and even myths suggest that such megatsunami are quite common along the Gulf Of Alaska. Until now, no Federal agency has taken on the monumental task of systematically cataloging landslide occurrence across the United States. Based on this initial investigation, USGS scientists recommended more fieldwork to determine geologic conditions that control landslide occurrence and size, systematic monitoring of steep slopes to detect slow movements or deformations that could possibly provide warning of landslide events, and tsunami modeling to determine the boat size that could be threatened by landslide-generated waves. On July 9, 1958, an earthquake with an estimated magnitude of 7.7-8.3 triggered an enormous rockfall in a remote bay along the Gulf of Alaska. More recently, in 2015, a rock avalanche in Wrangell-St. Elias National Park and Preserve about 300 kilometers northwest of GBNPP, travelled about 5 kilometers into Taan Fiord, and generated a tsunami that ran about 190 meters up the shoreline. See the data in the report, "Interferometric synthetic aperture radar data from 2020 for landslides at Barry Arm Fjord, Alaska.". The two arms that create the top of the T-shape of the bay are the Gilbert and Crillon inlets and are a part of a trench on the Fairweather Fault. Portions of the head and toe of the smaller Landslide B have shown a relatively small 3 inches of movement during the same period. (Getty) Melting glaciers in Alaska could unleash a ‘mega-tsunami’, an enormously high wall of water with incredible destructive power, scientists have warned. The October 2015 Tyndall Glacier rock avalanche caused one of the largest historic tsunamis in Alaska; maximum wave runup height measured from field evidence was 192 m (Haeussler et al. Ice and water from the glacier contributed to the tsunami generated by the sudden impact on the surface of the sea. It originated above land, but most of the deposit is underwater in Glacier Bay. Rock avalanches are particularly dangerous because they involve large volumes of earth material, they can move long distances (>1 kilometer), and they can travel very fast (up to 100 meters per second). The narrow entrance of the bay has a depth of only 33 feet (10 m). In the past 150 years Lituya Bay has had three other … (2018) seit 1984 mindestens 24 große Felsstürze aufgetreten. The Lituya Bay earthquake was powerful enough to generate a series of smaller landslides, both in the sea as on land, at a distance of 155 miles from the quake epicenter. I deal with the rocky road to our modern understanding of earth. A tale told by the native Tlingit Indians locates a mysterious cave deep below Lituya Bay. Glacier Bay and its inlets are a popular destination for cruise ships and passenger boats; about 540,000 people visited Glacier Bay National Park and Preserve (GBNPP) in 2017. A typical tour of the Bay traverses the entire length up to the glacier calving viewpoints in the Johns Hopkins and Tarr Inlets. A melting Alaska glacier could trigger an unprecedented ‘mega-tsunami,’ scientists have warned. You may opt-out by. The tsunami reached 524 m above sea level on the opposite shoreline and killed two people in a small boat. The landslide and tsunami occurred within Taan Fiord, and fortunately didn’t impact any structures. Die entstehenden Felsstürze bedecken Gebiete zwischen 5,5 und 22,2 Kubikkilometern. The moment was captured from a day cruise boat out … But geology is more than a historic or local science, as geological forces shaped and still influence history worldwide. A typical tour of the Bay traverses the entire length of the Bay to the glacier calving viewpoints in the Johns Hopkins and Tarr Inlets. It … Im Glacier Bay National Park in SE Alaska sind laut unseren Kollegen Coe et al. Seen from above Lituya Bay and its two glaciers appears shaped like the letter T, a particular shape caused by the Fairweather Fault, crossing the end of the bay from southeast to northwest. The areas of destroyed forest along the shorelines... [+] are recognizable as the light areas rimming the bay. In 2018, the National Park Service (NPS) article “Landslides and Giant Waves” said, “The combination of recent deglaciation, relatively frequent earthquakes, steep rocky slopes, and narrow inlets suggests that many locations in Glacier Bay have the potential for generating large tsunami waves” that could pose a threat to ships or boats nearby. Aerial photo of Lituya Bay showing traces of the 1958 tsunami in the vegetation regrown decades... [+] after the event. A landslide on the Lamplugh Glacier, in Glacier Bay National Park, Alaska, on June 28 caused seismic tremors about as strong as a small earthquake. Tsunami-inducing landslides are rare but have occurred in Alaska and elsewhere. A glacier in Alaska is threatening to trigger a potentially deadly and historic tsunami as it retreats under the overheated stress of climate change. I graduated in 2007 with a project studying how permafrost, that´s frozen soil, is reacting to the more.
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