The 1946 M S 7.4 earthquake may have ruptured a section of the megathrust offshore Unimak Island. [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. In Hilo, the death toll was high: 173 were killed, 163 injured, 488 buildings were demolished and 936 more were damaged. The tsunami magnitude of 9.3 is comparable to the magnitude 9.1 tsunami that devastated the Tohoku coast of Japan in 2011. 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. The shock had a moment magnitude of 8.6 and a maximum Mercalli intensity of VI (Strong). 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. 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 Eastern Aleutian earthquake of April 1, 1946 spawned Hawaii's most damaging tsunami. 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 … 2. Witnesses told of waves inundating streets, homes, and storefronts. World War II was over. On April 1, 1946, the sea floor ruptured just south of Unimak Island in the Aleutian Islands. 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 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. [5] The large-scale destruction prompted the creation of the Seismic Sea Wave Warning System, which became the Pacific Tsunami Warning Center in 1949. In spring of 1946, five men stationed at the Scotch Cap Lighthouse had reasons to be happy. 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 effects of the tsunami also reached Washington, Oregon, and California. 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 April 1, 1946 Pacific-wide tsunami was caused by a magnitude 7.3 Ms earthquake that occurred south of Unimak Island, Alaska. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands on April 1, 1946, and generated a Pacific-wide tsunami. 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. 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. 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. The deadliest earthquake in the US is the 1906 San Francisco earthquake. The magnitude 8.1 earthquake caused 165 casualties.
The earthquake seemed too small to spawn the huge local wave and scientists struggled for decades to figure out what happened. 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. Just 21 minutes ago, a 5.0-magnitude earthquake struck near the town of Akutan, Alaska. 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. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. 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 During the quake, a large section of seafloor was uplifted along the fault where the quake occurred, producing a large, Pacific-wide tsunami. 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. Their lonely Coast Guard assignment on Unimak Island would be over in a few months. (ITIC Archives; Photograph by Ted Lusdy). 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 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. (ITIC Archives; Photograph by Ted Lusdy). It also damaged fishing boats in Chile. In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy. Total damage was estimated at $26 million and, two years later, the United States established a Pacific Tsunami Warning Center in Hawaii. The tsunami magnitude of 9.3 is comparable to the magnitude 9.1 tsunami that devastated the Tohoku coast of Japan in 2011. 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]). The tsunami was also noticed in Santa Barbara and the greater Los Angeles area. They never knew what hit them in the 2 … Their lonely Coast Guard assignment on Unimak Island … [3], Waves reportedly traveled across the ocean at 500 miles an hour and measured 55 feet high, crest to trough, according to the USGS. On April 1, 1946, an undersea earthquake off the Alaskan coast triggers a massive tsunami that kills 159 people in Hawaii. The shock had a moment magnitude of 8.6 and a maximum Mercalli intensity of VI (Strong). On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. The lighthouse was completely destroyed and the entire five-man crew was killed. The tsunami obliterated the Scotch Cap Lighthouse on Unimak Island, Alaska among others, and killed all five lighthouse keepers. 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. Description. De 1946 Aleoeten aardbeving plaatsvond nabij de Aleoeten, Alaska april 1. 2. 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. In California, Fort Bragg reported five- to nine-foot waves. 1946 headline display newspaper ALASKA ALEUTIAN ISLANDS EARTHQUAKE & resulting Hawaii Tsunami strikes HILO - inv # 4B-227. Another six were killed in other parts of Hawaii. 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. Unimak Island acquired between 1998 and 2001 and interpret the observed deformation in terms of volcanic and tectonic activities. 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. The 1946 Aleutian Islands earthquake was an earthquake near the Aleutian Islands on April 1, 1946. Natural history. [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. The event triggered a Pacific-wide tsunami with multiple destructive waves at heights ranging from 45–130 ft. the western Unimak area did not rupture during the 1957 earthquake. In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy. 14) Magnitude: 8.5 – Banda Sea (1938-02-01) In 1946, megathrust seismicity along the Unimak segment of the Alaska subduction zone generated the largest ever recorded Alaska/Aleutian tsunami. 316 km 2 (=122 sqare miles) as a first-order estimate. M 8.6 - 1946 Aleutian Islands (Unimak Island) Earthquake, Alaska We focus on the deformation of Westdahl and Fisher volcanoes and the plate coupling in the source region of the 1946 earthquake. On Unimak Island's Pacific shore, a runup of 42 m destroyed the lighthouse at Scotch Cap. 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. AEC located nearly 100 aftershocks (open circles) through the end of the month (M>=1.9). Many victims were swept out to sea by receding water. 1946 Aleutian Islands Earthquake (Unimak Island) in Alaska. It completely destroyed the U.S. Coast Guard’s Scotch Cap lighthouse on Unimak and killed all five of its occupants. Before the tsunami dissipated it took the lives of more than 165 people and cause over $26 million (1946 dollars) in damage. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. A long-simmering scientific debate continues over just what caused the 1946 tsunami. Scotch Cap Lighthouse on Unimak Island, Alaska, before and after the April 1, 1946 earthquake and tsunami. This earthquake has 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. Despite the destruction to the Aleutian Island Unimak, the tsunami had almost an imperceptible effect on the Alaskan mainland. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands, Alaska on April 1. The tsunami flooded all coastlines of all islands and resulted in 159 deaths. One person drowned as a result of the ten-foot waves that struck Santa Cruz. The tsunami obliterated the Scotch Cap Lighthouse on Unimak Island, Alaska among others, and killed all five lighthouse keepers… 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. By John J. Miller, Roland von Huene, and Holly Ryan On April 1, 1946, the sea floor ruptured just south of Unimak Island in the Aleutian Islands. 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. Another six were killed in other parts of Hawaii. It resulted in 165–173 casualties and over $26 million in damage. 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. 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 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. On April 1, 1946, at 12:29 GMT, an earthquake occurred in the Aleutian Islands of Alaska. The 1946 M S 7.4 earthquake may have ruptured a section of the megathrust offshore Unimak Island. 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. 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. 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. One of the structures affected by the tsunami was the newly built Scotch Cap Lighthouse on Unimak Island, Alaska. 39811 km 2 (=15371 sqare miles) as a first-order estimate. The 1946 Aleutian Islands earthquake occurred near the Aleutian Islands on April 1, 1946, and generated a Pacific-wide tsunami. The 1946 Unimak Tsunami Earthquake Area: Revised Tectonic Structure in Reprocessed Seismic Images and a Suspect Near-Field Tsunami Source . 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