The seafloor along the fault was elevated, triggering a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. It got more and more puzzling as a seafloor search failed to reveal what scientists expected to find. The M w 8.6 earthquake in 1946 off the Pacific shore of Unimak Island at the end of the Alaska Peninsula generated a far-field tsunami that crossed the Pacific to Antarctica. GPS measurements on Unimak Island in the eastern Aleutian arc between 1998 and 2001 show deformation of Westdahl volcano and Fisher caldera. The 1946 Unimak earthquake occurred along the plate margin off Unimak Island in an unusually structured region that transitions from the Alaska to the Aleutian convergent margin system. Their lonely Coast Guard assignment on Unimak Island would be over in a few months. A tsunami over 100 ft high, triggered by an earthquake south of Unimak Island, struck the Scotch Cap Lighthouse at 2:18 a.m on April 1, 1946. When the Alaska National Interest Lands Conservation Act was passed on 2 December 1980, 910,000 acres (370,000 ha) of the island was designated as wilderness. The tsunami obliterated the Scotch Cap Lighthouse on Unimak Island, Alaska among others, and killed all five lighthouse keepers. April 1946 Unimak Island, USA Images On April 1, 1946, at 12:29 [local time] a rather strong magnitude 8.6 earthquake occurred with source to the south of Unimak Island, causing one of the most destructive tsunamis in the Pacific Ocean. The largest of these was a M8.6 earthquake on April 1, 1946, which generated a large tsunami that caused destruction and loss of life both locally on Unimak Island and more distantly at Hilo, Hawaii. They had survived. The Mw 8.6 earthquake in 1946 off the Pacific shore of Unimak Island at the end of the Alaska Peninsula generated a far-field tsunami that crossed the Pacific to Antarctica. 1946-11-01 11:14:28 UTC 7.0 magnitude, 25 km depth Andreanof Islands, Aleutian Island 7.0 magnitude earthquake 1946-11-01 11:14:28 UTC at 11:14 November 01, 1946 UTC Or, try our Real-time Notifications, Feeds, and Web Services . 316 km 2 (=122 sqare miles) as a first-order estimate. The lighthouse was completely destroyed and the entire five-man crew was killed. This earthquake is notable because it generated a disproportionately large tsunami given its surface wave magnitude (tsunami magnitude, M t , 9.3 [ Abe , 1979 ]). The wave reached Kauai, Hawaii 4.5 hours after the quake, and Hilo, Hawaii 4.9 hours later. Aftershocks of the 8.6 quake 1946 Aleutian Islands (Unimak Island) Earthquake, Alaska (USA, 1946-04-01 12:29 UTC More info Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. As with the earlier event it also caused a dangerous tsunami that caused significant damage in the Aleutian Islands and in Hawaii and was observed as far away as Chile. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands on April 1, 1946, and generated a Pacific-wide tsunami. The lighthouse was a few miles from the epicenter on Unimak Island, Alaska. A mystery surrounded this earthquake for a time. They had survived. De 1946 Aleoeten aardbeving plaatsvond nabij de Aleoeten, Alaska april 1. But the lighthouse tenders would never return to their homes in the Lower 48. The Mw 8.6 earthquake in 1946 off the Pacific shore of Unimak Island at the end of the Alaska Peninsula generated a far-field tsunami that crossed the Pacific to Antarctica. It completely destroyed the U.S. Coast Guard’s Scotch Cap lighthouse on Unimak and killed all five of its occupants. 39811 km 2 (=15371 sqare miles) as a first-order estimate. Description. In 1946, megathrust seismicity along the Unimak segment of the Alaska subduction zone generated the largest ever recorded Alaska/Aleutian tsunami. Scotch Cap Lighthouse on Unimak Island, Alaska, before and after the April 1, 1946 earthquake and tsunami. Wave heights reached an estimated 115 feet in Alaska, and averaged 30 feet in Hawaii, where the tsunami struck without warning nearly 5 hours after the earthquake. The effects of the tsunami also reached Washington, Oregon, and California. The leading theory was that the earthquake triggered an underwater landslide and the landslide gave rise to the big tsunami but a seafloor-mapping project by Scripps Institution of Oceanography, designed specifically to look for the cause of the tsunami, didn’t find evidence to support that theory. A Pacific-wide tsunami was triggered by the earthquake, which had a surface-wave magnitude of 7.8, an epicenter of 52.8° N, 163.5° W, and a focal depth of 25 km. 1946 Aleoeten aardbeving - 1946 Aleutian Islands earthquake. [5] The large-scale destruction prompted the creation of the Seismic Sea Wave Warning System, which became the Pacific Tsunami Warning Center in 1949. Hilo’s waterfront on the island of Hawaii was completely obliterated and 159 people lost the lives there. The 1946 Unimak Tsunami Earthquake Area: Revised Tectonic Structure in Reprocessed Seismic Images and a Suspect Near-Field Tsunami Source . One person drowned as a result of the ten-foot waves that struck Santa Cruz. 2. Aftershocks of the 6.5 quake: Unimak Island Region, Alaska (USA), 30 Oct 1946 07h47 Show info about this Based on its magnitude, the fault that was active during the quake ruptured along a surface of approx. One of the structures affected by the tsunami was the newly built Scotch Cap Lighthouse on Unimak Island, Alaska. The April 1, 1946 Pacific-wide tsunami was caused by a magnitude 7.3 Ms earthquake that occurred south of Unimak Island, Alaska. It resulted in 165–173 casualties and over $26 million in damage. M 8.6 - 1946 Aleutian Islands (Unimak Island) Earthquake, Alaska Total damage was estimated at $26 million and, two years later, the United States established a Pacific Tsunami Warning Center in Hawaii. the western Unimak area did not rupture during the 1957 earthquake. 13) Magnitude: 8.6 – South of Alaska Unimak Island Earthquake, Alaska (1946-04-01) This earthquake struck near Aleutian Islands and claimed between 165 – 173 casualties and resulted in nearly $26 million dollars of destruction. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. Oregon reported a ten-foot wave. Hawaii experienced the worst damage, with 159 deaths (96 at Hilo) and $26 million in property loss. On April 1, 1946, the sea floor ruptured just south of Unimak Island in the Aleutian Islands. On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. Many victims were swept out to sea by receding water. Van Wikipedia, ... met meerdere verwoestende golven op een hoogte variërend 45-130 ft. De tsunami uitgewist de Scotch Cap Lighthouse op Unimak Island, Alaska onder anderen, en doodde alle vijf vuurtorenbewaarders. The tsunami magnitude of 9.3 is comparable to the magnitude 9.1 tsunami that devastated the Tohoku coast of Japan in 2011. The event triggered a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. The Alaska Earthquake Center located a strong earthquake that occurred on Sunday, November 20, 2005 at 3:53 AM local time (12:53 UTC) in the Unimak Island region of Alaska (red star on the above map). Near-field surveyofthe 1946 Aleutian tsunami on Unimak and Sanak Islands Emile A. Okal1,George Plafker2,Costas E. Synolakis3, ... Islands, on the Alaska Peninsula west of the Kodiak-Shelikof Straits (158°W), or on anyofthe ... land of Unimak Island.Reports from an eyewitness interviewed at … It resulted in 165–173 casualties and over $26 million in damage. In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy. The most detailed and documented accounts of the tsunami come from Scotch Cap, located on Unimak Island, and the Hawaiian Islands. World War II was over. SEE PHOTO(s) - An ORIGINAL front page of a NEWSPAPER, the Oakland Tribune (CA) dated April 2, 1946.This original newspaper front page contains headline, map, … The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. (Courtesy U.S. Coast Guard) Scotch Cap lighthouse two months before the tsunami of April 1, 1946. The tsunami caused much damage in Maui as well. The event triggered a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. In Hilo, the death toll was high: 173 were killed, 163 injured, 488 buildings were demolished and 936 more were damaged. April 1, 1946, was witness to a deadly tsunami earthquake generated south of Unimak Island with a moment magnitude of 8.6. that caused consequential events that lent to a … It was followed by a Pacific-wide tsunami.The earthquake was a magnitude 8.6 (originally rated 7.8 but later revised), with its epicenter at 52.8°N, 163.5°W, and focal depth of 25 km. The tsunami magnitude of 9.3 is comparable to the magnitude 9.1 tsunami that devastated the Tohoku coast of Japan in 2011. On the first of April 1946 Alaska experienced one of its greatest tsunamis, triggered by an earthquake of magnitude 8.1 near Unimak Island in the Aleutian Island Chain. Total property damage in Alaska was $250,000 while California experienced one death and $10,000 damage from the tsunami. The shock had a moment magnitude of 8.6 and a maximum Mercalli intensity of VI (Strong). Unimak Island, Alaska has had: (M1.5 or greater) 0 earthquakes in the past 24 hours 2 earthquakes in the past 7 days; 15 earthquakes in the past 30 days De schok had een ogenblik magnitude van 8,6 en een maximale Mercalli intensiteit van VI ( Strong).Het resulteerde in 165-173 slachtoffers en meer dan $ 26 miljoen in schade. Witnesses told of waves inundating streets, homes, and storefronts. The lighthouse was a steel-reinforced concrete structure standing about ninety-five feet above sea level. Total property damage in Alaska was $250,000 while California experienced one death and $10,000 damage from the tsunami. Please visit our EBAY STORE for THOUSANDS MORE HISTORICAL NEWSPAPERS for SALE or at auction. By John J. Miller, Roland von Huene, and Holly Ryan World War II was over. One wave as high as a 13-story building hit locally. The magnitude 8.1 earthquake caused 165 casualties. Their lonely Coast Guard assignment on Unimak Island … Description. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. The tsunami was also noticed in Santa Barbara and the greater Los Angeles area. But the lighthouse tenders would never return to their homes in the Lower 48. The Earthquake Event Page application supports most recent browsers, view supported browsers. It also damaged fishing boats in Chile. One wave as high as a 13-story building hit locally. The magnitude 8.1 earthquake caused 165 casualties. The seafloor along the fault was elevated, triggering a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. They had survived. On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. This tsunami carried a wave height exceeding one hundred feet. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands on April 1, 1946, and generated a Pacific-wide tsunami. In spring of 1946, five men stationed at the Scotch Cap Lighthouse had reasons to be happy.

The quake triggered devastating tidal waves throughout the Pacific, particularly in Hawaii. The tsunami had little effect on the Alaskan mainland, due to the presence of the Aleutian Islands, which absorbed the brunt of the tsunami’s power. In the middle of the night, 13,000 Unimak Island, Alaska has had: (M1.5 or greater) 0 earthquakes in the past 24 hours 1 earthquake in the past 7 days; 4 earthquakes in the past 30 days Scotch Cap Lighthouse on Unimak Island, Alaska, before and after the April 1, 1946 earthquake and tsunami. Despite the destruction to the Aleutian Island Unimak, the tsunami had almost an imperceptible effect on the Alaskan mainland. add Nature:Earthquake and tsunami:Unimak Island 1946 to 'my astro' Biography Aleutian earthquake of magnitude 8,6 (updated 2006).A devastating tsunami followed the shock.The height of the tsunami reached 42 m.In Hawaii 159 deaths were to blame as the waves still climbed up to 12 m. Another six were killed in other parts of Hawaii. This earthquake is notable because it generated a disproportionately large tsunami given its surface wave magnitude (tsunami magnitude, M t, 9.3 [Abe, 1979]). Natural history. In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy.

Many victims were swept out to sea by receding water. add Nature:Earthquake and tsunami:Unimak Island 1946 to 'my astro' Biography Aleutian earthquake of magnitude 8,6 (updated 2006).A devastating tsunami followed the shock.The height of the tsunami reached 42 m.In Hawaii 159 deaths were to blame as the waves still climbed up to 12 m. This earthquake had the same magnitude of the earlier earthquake--8.6 on the moment magnitude scale (Johnson et al. 1946 Aleutian Islands Earthquake (Unimak Island) in Alaska. Scotch Cap Lighthouse sits on the southwest shore of Unimak Island two months before the giant wave of April 1, 1946. On April Fools Day in 1946 an earthquake off the coast of the Aleutian Islands in Alaska spawned a series of waves known as a tsunami. Unimak Island is part of the Alaskan continent that is geographically part of the Alaska [6], Earthquake near the Aleutian Islands, Alaska, "Comments for the Significant Earthquake", https://www.civilbeat.org/2011/03/9558-a-history-of-tsunamis-in-hawaii/, Tsunami Animation: Unimak Island, Aleutian Islands, 1946, Alaska National Interest Lands Conservation Act, https://en.wikipedia.org/w/index.php?title=1946_Aleutian_Islands_earthquake&oldid=949891129, Short description is different from Wikidata, Creative Commons Attribution-ShareAlike License, This page was last edited on 9 April 2020, at 03:21. Waves there demolished 77 homes and many other buildings. Required fields are marked *. [3], Waves reportedly traveled across the ocean at 500 miles an hour and measured 55 feet high, crest to trough, according to the USGS. 2. (U.S. Coast Guard photographs) Tsunami waves advancing across Coconut Island, at the Hilo Bay waterfront. The waveform analysis indicates unilateral rupture from east to west and three large pulses of moment release located along the fault (Beck and Christensen, 1991).
The earthquake seemed too small to spawn the huge local wave and scientists struggled for decades to figure out what happened. When the Alaska National Interest Lands Conservation Act was passed on 2 December 1980, 910,000 acres (370,000 ha) of the island was designated as wilderness. The 1946 M S 7.4 earthquake may have ruptured a section of the megathrust offshore Unimak Island. At the lighthouse 5 men lost … The April 1, 1946 Pacific-wide tsunami was caused by a magnitude 7.3 Ms earthquake that occurred south of Unimak Island, Alaska. Their lonely Coast Guard assignment on Unimak Island would be over in a few months. (ITIC Archives; Photograph by Ted Lusdy). The tsunami reached the Hawaiian Islands five hours later, causing considerable damage and loss of life. It completely destroyed the U.S. Coast Guard’s Scotch Cap lighthouse on Unimak and killed all five of its occupants. The tsunami arrived at … Near-field surveyofthe 1946 Aleutian tsunami on Unimak and Sanak Islands Emile A. Okal1,George Plafker2,Costas E. Synolakis3, and Jose´ C. Borrero3 1 Department … On April 1, 1946, the sea floor ruptured just south of Unimak Island in the Aleutian Islands. Unimak Island acquired between 1998 and 2001 and interpret the observed deformation in terms of volcanic and tectonic activities. 1994)--but was to the west of the 1946 earthquake, near the Andreanof Islands. The 1946 Aleutian Islands earthquake was an earthquake near the Aleutian Islands on April 1, 1946. The Eastern Aleutian earthquake of April 1, 1946 spawned Hawaii's most damaging tsunami. We focus on the deformation of Westdahl and Fisher volcanoes and the plate coupling in the source region of the 1946 earthquake. During the quake, a large section of seafloor was uplifted along the fault where the quake occurred, producing a large, Pacific-wide tsunami. For this puzzling event, maximum near-field run-up (42 m) is more than 6 times the computed average dip slip on the source fault (Johnson and Satake, 1997). 14) Magnitude: 8.5 – Banda Sea (1938-02-01) The deadliest earthquake in the US is the 1906 San Francisco earthquake. On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. The low coupling across the rupture zone of the 1946 earthquake is a strong argument for the idea that the earthquake and tsunami did not result from a purely double-couple (earthquake) source. Despite the destruction to the Aleutian Island Unimak, the tsunami had … On the first of April 1946 Alaska experienced one of its greatest tsunamis, triggered by an earthquake of magnitude 8.1 near Unimak Island in the Aleutian Island Chain. Seawater displaced by the giant earthquake sent a 100-foot wave into the Scotch Cape lighthouse on Unimak, destroying the concrete structure and killing the five men inside. 1946-04-01 12:29:01 UTC 8.6 magnitude, 15 km depth Akutan, Alaska, United States 8.6 magnitude earthquake 1946-04-01 12:29:01 UTC at 12:29 April 01, 1946 UTC 1946 headline display newspaper ALASKA ALEUTIAN ISLANDS EARTHQUAKE & resulting Hawaii Tsunami strikes HILO - inv # 4B-227. In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy. The Mw 8.6 earthquake in 1946 off the Pacific shore of Unimak Island at the end of the Alaska Peninsula generated a far-field tsunami that crossed the Pacific to Antarctica. Wave heights reached an estimated 115 feet in Alaska, and averaged 30 feet in Hawaii, where the tsunami struck without warning nearly 5 hours after the earthquake. The April 1, 1946 Aleutian earthquake (Ms 7.4; Mw 8.2) stands out among tsunamigenic events because it generated both very high run-up near the earthquake source region and a destructive trans-Pacific tsunami. It is the charter member of "tsunami" earthquakes that produce outsized far-field tsunamis for the recorded magnitude. AEC located nearly 100 aftershocks (open circles) through the end of the month (M>=1.9). Seawater displaced by the giant earthquake sent a 100-foot wave into the Scotch Cape lighthouse on Unimak, destroying the concrete structure and killing the five men inside. Generation by one or more major earthquake triggered submarine landslides near the shelf edge south of Unimak Island seems to be the only viable mechanism to account for the data on wave arrival time, run-up heights, and the distribution of tsunamis across the Pacific. Their lonely Coast Guard assignment on Unimak Island would be over in a few months. On April 1, 1946 at 4:28 am (12:28 UTC), an 8.6 moment magnitude earthquake struck off the coast of Unimak Island in Alaska’s Aleutian Islands, generating a tsunami that caused the greatest damage and number of deaths in Hawaii’s history, leading to the creation of the United States’ first tsunami warning system. This earthquake has The tsunami crossed the Pacific, producing waves up to thirty feet high in French Polynesia. The shock had a moment magnitude of 8.1 and a maximum Mercalli intensity of VI (Strong).It resulted in 165 casualties (159 people on Hawaii and six in Alaska) and over $26 million in damage. The tremor was recorded early morning on Wednesday 4 November 2020 at 3.23 am local time, at a moderately shallow depth of 27 miles below the surface. The effects of the tsunami were felt along the west coast of the United States, in Washington, Oregon, and California. This tsunami carried a wave height exceeding one hundred feet. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. The earthquake seemed too small to spawn the huge local wave and scientists struggled for decades to figure out what happened. The tsunami severely damaged Pacific islands and coastal areas from Alaska to Antarctica. They never knew what hit them in the 2 … Just 21 minutes ago, a 5.0-magnitude earthquake struck near the town of Akutan, Alaska. On April 1, 1946, an undersea earthquake off the Alaskan coast triggers a massive tsunami that kills 159 people in Hawaii. A 7.8 earthquake off the coast of the Aleutian Islands of Alaska on April 1, 1946 triggered a tsunami which caused the death of 165 people and caused more than $26 million in damage. The M w 8.6 earthquake in 1946 off the Pacific shore of Unimak Island at the end of the Alaska Peninsula generated a far‐field tsunami that crossed the Pacific to Antarctica. World War II was over. World War II was over. A 7.8 earthquake off the coast of the Aleutian Islands of Alaska on April 1, 1946 triggered a tsunami which caused the death of 165 people and caused more than $26 million in damage. Researchers did see colorful corals and an unusual methane seep teaming with marine life, but the sea floor looked as if it had been undisturbed for millennia. In 1946, the M8.6 earthquake on Unimak Island in Alaska occurred on April 1 and triggered a gigantic 55 feet high tsunami, travelling at 500 miles an hour across the Pacific Ocean. A long-simmering scientific debate continues over just what caused the 1946 tsunami. The event was classified as a tsunami earthquake due to the discrepancy between the size of the tsunami and the relatively low surface wave magnitude. On April 1, 1946, at 12:29 GMT, an earthquake occurred in the Aleutian Islands of Alaska. In 1946 at Unimak Pass, Alaska, a tsunami destroyed the lighthouse at Scotch Cap, Unimak Island, took 159 lives on the Hawaiian Islands, damaged island coastal facilities across the south Pacific, and destroyed a hut in Antarctica. The tsunami flooded all coastlines of all islands and resulted in 159 deaths. The tsunami obliterated the Scotch Cap Lighthouse on Unimak Island, Alaska among others, and killed all five lighthouse keepers… Hawaii experienced the worst damage, with 159 deaths (96 at Hilo) and $26 million in property loss. On April Fools Day in 1946 an earthquake off the coast of the Aleutian Islands in Alaska spawned a series of waves known as a tsunami. They had survived. 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