A B Smithsonian Institution Global Volcanism Program Website. A Mount Redoubt a Cook Inlet nyugati oldaln hzdik, 180 km-re Anchoragetl Redoubt reported activity, including all types of volcanic activity. A majority of the mudflows coursed to Cook Inlet, about 22 miles (35km) from the volcano. A local name, "Ujakushatsch", also means "fortified place", but it is difficult to determine if one name is derived from the other. In 1819, smoke was observed at the mountain. Redoubt Volcano after the 1989 to 1990 eruptions. The ash blanketed an area of about 7,700sqmi (20,000km2). Mt. Simplified plate tectonics cross-section showing how Redoubt is located above a subduction zone formed where the Pacific and North America plates collide. There have been many explosive eruptions, ash has blanketed the landscape and floods have swept down the Drift River. Lava flows in the crater built several lava domes which were later destroyed by explosions. The volcano last erupted in 1989 -- Redoubt is not the only volcano which threatens aircraft and creates ash-related hazards. [19] Sudden melting of snow and ice at the summit caused by pyroclastic flows and dome collapses caused lahars, or mudflows, which flowed down the north flank of the mountain. View from the northeast. Built above the Aleutian subduction zone over the last 890,000 years, Redoubt is now heavily glaciated and boasts an ice-filled summit crater. Redoubt during the summer of 1778, describing it as "emitting a white smoke but no fire which made some think it was no more than a white thick cloud such as we have frequently seen on the Coast, for the most part appearing on the sides of hills and often extends along a whole range and at different times falls or rises, expands or contracts itself and has a resemblance to Clouds of white smoke. Mehr sehen Boeing 747 Die Boeing 747, auch Jumbo-Jet in Anlehnung an den Elefanten Jumbo, ist ein vierstrahliges Groraumflugzeug des amerikanischen Flugzeugherstellers Boeing, das seit seiner Entwicklung in den 1960er-Jahren ber mehrere Jahrzehnte das weltgrte Passagierflugzeug war. The 1989-90 dome is completely covered and no anomalous holes or steaming were observed on this day. Photo by Game McGimsey, Alaska Volcano Observatory / U.S. Geological Survey. The Drift River Oil Terminal can be seen in this view. The Augustine observations, the first made using the VHF lightning mapping approach, were obtained using two mapping stations that The full range of impacts of the 1989-1990 eruption of Redoubt Volcano is discussed in U.S. Geological Survey Circular 1061 (Brantley, 1990). On January 30, 2009, scientists from the Alaska Volcano Observatory (AVO) warned that an eruption was imminent, sending experienced[clarification needed] Alaskans shopping for protection against a dusty shower of volcanic ash that could descend on south-central Alaska. The last eruption of the 20th century began in December 1989 with a short period of intense seismicity and vent-clearing explosions that continued for more than five months. read all. Redoubt eruption: The most recent eruptive activity at Redoubt volcano began on March 22, 2009. Beginning March 22nd, 2009, Mount Redoubt, in Alaska, began a series of volcanic eruptions, and continues to be active to this date. Local time: January 26, 2021 1415 AKST (January 26, 2021 2315 UTC) Explosive eruptions in the 1960s caused flooding and lahars from melting glaciers, and created ash plumes that reached 6 km in height. Redoubt Volcano, or Mount Redoubt (Russian: ), is an active stratovolcano in the largely volcanic Aleutian Range of the U.S. state of Alaska. Starting Dec. 14, 1989, 30 years ago last week, Mount Redoubt erupted. The energetic explosions produced powerful volcanic lightning storms, the largest of which rivaled the intensity of the massive supercell thunderstorms that frequent the midwestern Great Plains. Alaska's Mount Redoubt volcano finally erupted a whopping five times after months of anticipation that it was on the verge of blowing its top. The eruptions have all originated from a vent at the north end of the summit crater. January 2006 eruption of Mount St. Augustine, which sits farther to the south in Cook Inlet. It caught KLM Flight 867, a Boeing 747 aircraft, in its plume. Redoubt is also one of the most active of the Cook Inlet volcanoes. A huge cloud of ash heralded the volcano's fourth and most damaging eruption of this century. Activity in the last 10,000 years has included a major collapse of the summit which resulted in a debris flow that reached the Cook Inlet, and clay-rich lahars that formed when hot material (most likely ash and gas eruptions) melted parts of the glaciers which cover Redoubt. Mount Redoubt Volcano In Alaska Erupts Explosively Date: March 23, 2009 Source: U.S. Geological Survey Summary: Alaska's Mount Redoubt Volcano has erupted, spewing ash thousands of Mount Redoubt eruptions, this report conveys findings and recommendations with national relevance. Located at the head of the Chigmit Mountains subrange in Lake Clark National Park and Preserve, the mountain is just west of Cook Inlet, in the Kenai Peninsula Borough about 110 miles (180 km) southwest of Anchorage. A great eruption took place in 1881, when a party of native hunters half-way up its slopes were overwhelmed by a lava-flow and only two escaped." Her concentration is in volcanology, and she is currently researching lava dome collapses and pyroclastic flows. Following a period of above-background seismicity beginning on January 25, 2009, Redoubt had a minor gas-and-ash explosion on March 15. Its last eruption was in 2009. Redoubt's eruptions pose a direct hazard to aircraft, especially in the high-traffic flight paths that pass over the Aleutian volcanic arc. Also present on the mountain are Holocene lahar deposits that extend as far as the Cook Inlet. Redoubt is also capable of producing pyroclastic flows and surges, but aside from ash-related hazards, the next most pressing concern of a Redoubt eruption would be lahars. At 10,197 feet (3,108m), in just over 5 miles (8km) Mount Redoubt attains 9,150 feet (2,700m) of prominence over its surrounding terrain. Redoubt is a subduction zone volcano, deriving its magma from melt created when the Pacific plate dives beneath the North America plate. Damage from the eruption was estimated at $160 million,[22] the second costliest volcanic eruption in United States history.[19]. Redoubt March 26, 2009 Mount Redoubt has erupted five times since 1900: in 1902, 1922, 1966, 1989 and 2009. It is potentially one of the most dangerous volcanoes in Alaska. Made up of pyroclastic flow deposits and lava flows, and resting on Mesozoic era rocks of the Aleutian Mountain Range batholith, the mountain has been somewhat weathered by movement of several glaciers that reside on it. In contrast to the explosive eruptions of the previous week, ash emissions from Mount Redoubt became more frequent but confined to lower altitudes on March 30, 2009. [9], The volcano is about 3.7 miles (6.0km) in diameter at its base with a rough volume of 7.2to 8.4cumi (3035km3). It last erupted in 1989 and 1990, sending a plume of ash into the atmosphere large enough to interfere with air traffic. For a more detailed view see Figure 1 in United States Geological Survey Open File Report 00-0365: Eastern Aleutian Volcanic Arc Digital Model. At the time, the eruption was one of the costliest eruptions in U.S. history, said Joel Hard, superintendent of Lake Clark National Park and Preserve. Mount St. Augustine Eruption. Der Mount Redoubt ist ein mit Gletschern bedeckter, Januar eine Eruption hatte und das Land in einem Umkreis von 150 km mit Asche und Lava bedeckte. On the basis of this change in activity, AVO increased the level of concern and alert level to ORANGE/WATCH. Located at the head of the Chigmit Mountains subrange in Lake Clark National Park and Preserve, the mountain is just west of Cook Inlet, in the Kenai Peninsula Borough about 110 miles (180km) southwest of Anchorage. Location of Redoubt volcano (Image creators: Schaefer, Janet and Cameron, Cheryl; Latest news. Active for millennia, Mount Redoubt has erupted four times since it was first observed: in 1902, 1966, 1989 and 2009, with two questionable eruptions in 1881 and 1933. The lahars entered a nearby river, worrying officials that they might destroy an oil storage facility located along it. Photograph by Caleb Schiff, AVO/USGS. This subduction zone has created both the Aleutian Trench, about 270 miles to the southeast of the volcano, and the Aleutian volcanic arc, of which Redoubt is a part.
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