It got more and more puzzling as a seafloor search failed to reveal what scientists expected to find. In Hilo, the death toll was high: 173 were killed, 163 injured, 488 buildings were demolished and 936 more were damaged. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. 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. 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. 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. This earthquake had the same magnitude of the earlier earthquake--8.6 on the moment magnitude scale (Johnson et al. In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy. 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.

The quake triggered devastating tidal waves throughout the Pacific, particularly in Hawaii. 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. [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. [3], The tsunami was unusually powerful for the size of the earthquake. 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). On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. 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 1946 Unimak Tsunami Earthquake Area: Revised Tectonic Structure in Reprocessed Seismic Images and a Suspect Near-Field Tsunami Source . 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. Your email address will not be published. 39811 km 2 (=15371 sqare miles) as a first-order estimate. This earthquake is notable because it generated a disproportionately large tsunami given its surface wave magnitude (tsunami magnitude, M t , 9.3 [ Abe , 1979 ]). (ITIC Archives; Photograph by Ted Lusdy). This earthquake has Natural history. Natural history. 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). Their lonely Coast Guard assignment on Unimak Island would be over in a few months. Required fields are marked *. The earthquake seemed too small to spawn the huge local wave and scientists struggled for decades to figure out what happened. The event triggered a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. Scotch Cap Lighthouse on Unimak Island, Alaska, before and after the April 1, 1946 earthquake and tsunami. It completely destroyed the U.S. Coast Guard’s Scotch Cap lighthouse on Unimak and killed all five of its occupants. 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. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. the western Unimak area did not rupture during the 1957 earthquake. Unimak Island is part of the Alaskan continent that is geographically part of the Alaska On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. The shock had a moment magnitude of 8.6 and a maximum Mercalli intensity of VI (Strong). 2. 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). 2. 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 But the lighthouse tenders would never return to their homes in the Lower 48. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. [4] The residents of these islands were caught off-guard by the onset of the tsunami due to the inability to transmit warnings from the destroyed posts at Scotch Cap, and the tsunami is known as the April Fools' Day Tsunami in Hawaii because it happened on April 1 and many thought it to be an April Fool's Day prank. [3], Waves reportedly traveled across the ocean at 500 miles an hour and measured 55 feet high, crest to trough, according to the USGS. 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. 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. This earthquake is notable because it generated a disproportionately large tsunami given its surface wave magnitude (tsunami magnitude, M t, 9.3 [Abe, 1979]). Hilo’s waterfront on the island of Hawaii was completely obliterated and 159 people lost the lives there. 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. Scotch Cap Lighthouse on Unimak Island, Alaska, before and after the April 1, 1946 earthquake and tsunami. They never knew what hit them in the 2 … 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. 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 … 1994)--but was to the west of the 1946 earthquake, near the Andreanof Islands. One wave as high as a 13-story building hit locally. Oregon reported a ten-foot wave. This tsunami carried a wave height exceeding one hundred feet. The lighthouse was completely destroyed and the entire five-man crew was killed. The magnitude 8.1 earthquake caused 165 casualties. De 1946 Aleoeten aardbeving plaatsvond nabij de Aleoeten, Alaska april 1. 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. 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. In California, Fort Bragg reported five- to nine-foot waves. It resulted in 165–173 casualties and over $26 million in damage. 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. World War II was over. 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. Many victims were swept out to sea by receding water. It completely destroyed the U.S. Coast Guard’s Scotch Cap lighthouse on Unimak and killed all five of its occupants. The event triggered a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. The most detailed and documented accounts of the tsunami come from Scotch Cap, located on Unimak Island, and the Hawaiian Islands. The deadliest earthquake in the US is the 1906 San Francisco earthquake. The wave reached Kauai, Hawaii 4.5 hours after the quake, and Hilo, Hawaii 4.9 hours later. 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. A mystery surrounded this earthquake for a time. 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. In the middle of the night, 13,000 In 1946, megathrust seismicity along the Unimak segment of the Alaska subduction zone generated the largest ever recorded Alaska/Aleutian tsunami. (U.S. Coast Guard photographs) Tsunami waves advancing across Coconut Island, at the Hilo Bay waterfront. The tsunami crossed the Pacific, producing waves up to thirty feet high in French Polynesia. 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. Total damage was estimated at $26 million and, two years later, the United States established a Pacific Tsunami Warning Center in Hawaii. 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. 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. The effects of the tsunami also reached Washington, Oregon, and California. It resulted in 165–173 casualties and over $26 million in damage. M 8.6 - 1946 Aleutian Islands (Unimak Island) Earthquake, Alaska 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 seafloor along the fault was elevated, triggering a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. The April 1, 1946 Pacific-wide tsunami was caused by a magnitude 7.3 Ms earthquake that occurred south of Unimak Island, Alaska. The lighthouse was a steel-reinforced concrete structure standing about ninety-five feet above sea level. 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. 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 Eastern Aleutian earthquake of April 1, 1946 spawned Hawaii's most damaging tsunami. 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 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. It also damaged fishing boats in Chile. In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy. The lighthouse was a few miles from the epicenter on Unimak Island, Alaska. On April 1, 1946, the sea floor ruptured just south of Unimak Island in the Aleutian Islands. Despite the destruction to the Aleutian Island Unimak, the tsunami had … 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. Or, try our Real-time Notifications, Feeds, and Web Services . 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. 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. The April 1, 1946 Pacific-wide tsunami was caused by a magnitude 7.3 Ms earthquake that occurred south of Unimak Island, Alaska. 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. Hawaii experienced the worst damage, with 159 deaths (96 at Hilo) and $26 million in property loss. 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. 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 … The tsunami was also noticed in Santa Barbara and the greater Los Angeles area. The 1946 M S 7.4 earthquake may have ruptured a section of the megathrust offshore Unimak Island. Hawaii experienced the worst damage, with 159 deaths (96 at Hilo) and $26 million in property loss. Total property damage in Alaska was $250,000 while California experienced one death and $10,000 damage from the tsunami. 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. The magnitude 8.1 earthquake caused 165 casualties. 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. World War II was over. Please visit our EBAY STORE for THOUSANDS MORE HISTORICAL NEWSPAPERS for SALE or at auction.
The earthquake seemed too small to spawn the huge local wave and scientists struggled for decades to figure out what happened. The tsunami obliterated the Scotch Cap Lighthouse on Unimak Island, Alaska among others, and killed all five lighthouse keepers… 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 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 effects of the tsunami were felt along the west coast of the United States, in Washington, Oregon, and California. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands on April 1, 1946, and generated a Pacific-wide tsunami. The tsunami reached the Hawaiian Islands five hours later, causing considerable damage and loss of life. In spring of 1946, five men stationed at the Scotch Cap Lighthouse had reasons to be happy. Their lonely Coast Guard assignment on Unimak Island would be over in a few months. On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. (U.S. Coast Guard photographs) Tsunami waves advancing across Coconut Island, at the Hilo Bay waterfront. Waves there demolished 77 homes and many other buildings. Description. 1946 Aleoeten aardbeving - 1946 Aleutian Islands earthquake. 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 The tsunami obliterated the Scotch Cap Lighthouse on Unimak Island, Alaska among others, and killed all five lighthouse keepers. 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 had little effect on the Alaskan mainland, due to the presence of the Aleutian Islands, which absorbed the brunt of the tsunami’s power. 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. 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. 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. One wave as high as a 13-story building hit locally. The shock had a moment magnitude of 8.6 and a maximum Mercalli intensity of VI (Strong). The 1946 M S 7.4 earthquake may have ruptured a section of the megathrust offshore Unimak Island. 14) Magnitude: 8.5 – Banda Sea (1938-02-01) One person drowned as a result of the ten-foot waves that struck Santa Cruz. It is the charter member of "tsunami" earthquakes that produce outsized far-field tsunamis for the recorded magnitude. The 1946 Aleutian Islands earthquake was an earthquake near the Aleutian Islands on April 1, 1946. (adsbygoogle = window.adsbygoogle || []).push({}); Your email address will not be published. By John J. Miller, Roland von Huene, and Holly Ryan The tsunami caused much damage in Maui as well.

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