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. The effects of the tsunami also reached Washington, Oregon, and California. The 1946 Unimak Tsunami Earthquake Area: Revised Tectonic Structure in Reprocessed Seismic Images and a Suspect Near-Field Tsunami Source . The tsunami reached the Hawaiian Islands five hours later, causing considerable damage and loss of life. 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. This earthquake is notable because it generated a disproportion-ately large tsunami given its surface wave magnitude (tsu-nami magnitude, M t, 9.3 [Abe, 1979]). Total damage was estimated at $26 million and, two years later, the United States established a Pacific Tsunami Warning Center in Hawaii. 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. They never knew what hit them in the 2 … But the lighthouse tenders would never return to their homes in the Lower 48. 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 … 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. It is the charter member of "tsunami" earthquakes that produce outsized far-field tsunamis for the recorded magnitude. 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 Oregon reported a ten-foot wave. 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. But the lighthouse tenders would never return to their homes in the Lower 48. Before the tsunami dissipated it took the lives of more than 165 people and cause over $26 million (1946 dollars) in damage. 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. On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. On April 1, 1946, at 12:29 GMT, an earthquake occurred in the Aleutian Islands of Alaska. 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. 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 tsunami caused much damage in Maui as well. 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 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. The Eastern Aleutian earthquake of April 1, 1946 spawned Hawaii's most damaging tsunami. 1946 headline display newspaper ALASKA ALEUTIAN ISLANDS EARTHQUAKE & resulting Hawaii Tsunami strikes HILO - inv # 4B-227. Despite the destruction to the Aleutian Island Unimak, the tsunami had …

Many victims were swept out to sea by receding water. Unimak Island acquired between 1998 and 2001 and interpret the observed deformation in terms of volcanic and tectonic activities. 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 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 Fools Day in 1946 an earthquake off the coast of the Aleutian Islands in Alaska spawned a series of waves known as a tsunami. Their lonely Coast Guard assignment on Unimak Island would be over in a few months. (ITIC Archives; Photograph by Ted Lusdy). One person drowned as a result of the ten-foot waves that struck Santa Cruz. It completely destroyed the U.S. Coast Guard’s Scotch Cap lighthouse on Unimak and killed all five of its occupants. 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. On April 1, 1946, the sea floor ruptured just south of Unimak Island in the Aleutian Islands. In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy. The great Mw=8.7 Rat Islands underthrusting earthquake (larger star on the above map) of February 4, 1965, ruptured a 600-km segment of the western end of the Aleutian Islands (black solid line). [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. 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 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). The 1946 M S 7.4 earthquake may have ruptured a section of the megathrust offshore Unimak Island. 1946 Aleoeten aardbeving - 1946 Aleutian Islands earthquake. Total property damage in Alaska was $250,000 while California experienced one death and $10,000 damage from the tsunami. On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. 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. Required fields are marked *. A long-simmering scientific debate continues over just what caused the 1946 tsunami. The shock had a moment magnitude of 8.6 and a maximum Mercalli intensity of VI (Strong). 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. 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 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. The seafloor along the fault was elevated, triggering a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. Their lonely Coast Guard assignment on Unimak Island … The most detailed and documented accounts of the tsunami come from Scotch Cap, located on Unimak Island, and the Hawaiian Islands. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands on April 1, 1946, and generated a Pacific-wide tsunami. They had survived. The lighthouse was completely destroyed and the entire five-man crew was killed. 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 … 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. We focus on the deformation of Westdahl and Fisher volcanoes and the plate coupling in the source region of the 1946 earthquake. 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. Another six were killed in other parts of Hawaii. Or, try our Real-time Notifications, Feeds, and Web Services . The 1946 M S 7.4 earthquake may have ruptured a section of the megathrust offshore Unimak Island. The tsunami crossed the Pacific, producing waves up to thirty feet high in French Polynesia.

The quake triggered devastating tidal waves throughout the Pacific, particularly in Hawaii. In 1946, megathrust seismicity along the Unimak segment of the Alaska subduction zone generated the largest ever recorded Alaska/Aleutian tsunami. This tsunami carried a wave height exceeding one hundred feet. It got more and more puzzling as a seafloor search failed to reveal what scientists expected to find. 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. The April 1, 1946 Pacific-wide tsunami was caused by a magnitude 7.3 Ms earthquake that occurred south of Unimak Island, Alaska. The seafloor along the fault was elevated, triggering a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. Witnesses told of waves inundating streets, homes, and storefronts. The magnitude 8.1 earthquake caused 165 casualties. 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 lighthouse was a steel-reinforced concrete structure standing about ninety-five feet above sea level. The wave reached Kauai, Hawaii 4.5 hours after the quake, and Hilo, Hawaii 4.9 hours later. World War II was over. 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 On April 1, 1946, the sea floor ruptured just south of Unimak Island in the Aleutian Islands. GPS measurements on Unimak Island in the eastern Aleutian arc between 1998 and 2001 show deformation of Westdahl volcano and Fisher caldera. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. 14) Magnitude: 8.5 – Banda Sea (1938-02-01) They had survived. Description. The earthquake seemed too small to spawn the huge local wave and scientists struggled for decades to figure out what happened. Please visit our EBAY STORE for THOUSANDS MORE HISTORICAL NEWSPAPERS for SALE or at auction. The April 1, 1946 Pacific-wide tsunami was caused by a magnitude 7.3 Ms earthquake that occurred south of Unimak Island, Alaska. 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. 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. M 8.6 - 1946 Aleutian Islands (Unimak Island) Earthquake, Alaska At the lighthouse 5 men lost … 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. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. During the quake, a large section of seafloor was uplifted along the fault where the quake occurred, producing a large, Pacific-wide tsunami. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands on April 1, 1946, and generated a Pacific-wide tsunami. They had survived. 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. World War II was over. World War II was over. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. 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 event triggered a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. A mystery surrounded this earthquake for a time. 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. It also damaged fishing boats in Chile. The 1946 M S 7.4 earthquake may have ruptured a section of the megathrust offshore Unimak Island. Natural history. (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published. 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. On April 1, 1946, an undersea earthquake off the Alaskan coast triggers a massive tsunami that kills 159 people in Hawaii. The tsunami obliterated the Scotch Cap Lighthouse on Unimak Island, Alaska among others, and killed all five lighthouse keepers. The tsunami obliterated the Scotch Cap Lighthouse on Unimak Island, Alaska among others, and killed all five lighthouse keepers… The shock had a moment magnitude of 8.6 and a maximum Mercalli intensity of VI (Strong). 39811 km 2 (=15371 sqare miles) as a first-order estimate. 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 Scotch Cap Lighthouse sits on the southwest shore of Unimak Island two months before the giant wave of April 1, 1946. This tsunami carried a wave height exceeding one hundred feet. The tsunami arrived at … 1994)--but was to the west of the 1946 earthquake, near the Andreanof Islands. Scotch Cap Lighthouse on Unimak Island, Alaska, before and after the April 1, 1946 earthquake and tsunami. Their lonely Coast Guard assignment on Unimak Island would be over in a few months. 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. 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, … (U.S. Coast Guard photographs) Tsunami waves advancing across Coconut Island, at the Hilo Bay waterfront. In spring of 1946, five men stationed at the Scotch Cap Lighthouse had reasons to be happy. 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 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. [5] The large-scale destruction prompted the creation of the Seismic Sea Wave Warning System, which became the Pacific Tsunami Warning Center in 1949. 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. Their lonely Coast Guard assignment on Unimak Island would be over in a few months. By John J. Miller, Roland von Huene, and Holly Ryan the western Unimak area did not rupture during the 1957 earthquake.
The earthquake seemed too small to spawn the huge local wave and scientists struggled for decades to figure out what happened. Waves there demolished 77 homes and many other buildings. In the middle of the night, 13,000 In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy. In Hilo, the death toll was high: 173 were killed, 163 injured, 488 buildings were demolished and 936 more were damaged. The 1946 Aleutian Islands earthquake was an earthquake near the Aleutian Islands on April 1, 1946. (U.S. Coast Guard photographs) Tsunami waves advancing across Coconut Island, at the Hilo Bay waterfront. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. 316 km 2 (=122 sqare miles) as a first-order estimate. 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. One wave as high as a 13-story building hit locally. The lighthouse was a few miles from the epicenter on Unimak Island, Alaska. The Earthquake Event Page application supports most recent browsers, view supported browsers. 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. Your email address will not be published. It completely destroyed the U.S. Coast Guard’s Scotch Cap lighthouse on Unimak and killed all five of its occupants. Natural history. 1 The earthquake was ~7.3 magnitude. 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. It resulted in 165–173 casualties and over $26 million in damage. 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 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. Hawaii experienced the worst damage, with 159 deaths (96 at Hilo) and $26 million in property loss. 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