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unimak island earthquake alaska 1946

unimak island earthquake alaska 1946

[3], Waves reportedly traveled across the ocean at 500 miles an hour and measured 55 feet high, crest to trough, according to the USGS. AEC located nearly 100 aftershocks (open circles) through the end of the month (M>=1.9). the western Unimak area did not rupture during the 1957 earthquake. Despite the destruction to the Aleutian Island Unimak, the tsunami had almost an imperceptible effect on the Alaskan mainland. Scotch Cap Lighthouse on Unimak Island, Alaska, before and after the April 1, 1946 earthquake and tsunami. 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. 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 the middle of the night, 13,000 The shock had a moment magnitude of 8.6 and a maximum Mercalli intensity of VI (Strong). 316 km 2 (=122 sqare miles) as a first-order estimate.

Many victims were swept out to sea by receding water. 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). The lighthouse was a few miles from the epicenter on Unimak Island, Alaska. 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. GPS measurements on Unimak Island in the eastern Aleutian arc between 1998 and 2001 show deformation of Westdahl volcano and Fisher caldera. Before the tsunami dissipated it took the lives of more than 165 people and cause over $26 million (1946 dollars) in damage. 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. World War II was over. The lighthouse was a steel-reinforced concrete structure standing about ninety-five feet above sea level. 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. 14) Magnitude: 8.5 – Banda Sea (1938-02-01) 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 tsunami obliterated the Scotch Cap Lighthouse on Unimak Island, Alaska among others, and killed all five lighthouse keepers. The Eastern Aleutian earthquake of April 1, 1946 spawned Hawaii's most damaging tsunami. World War II was over. The magnitude 8.1 earthquake caused 165 casualties. Their lonely Coast Guard assignment on Unimak Island would be over in a few months. 1 The earthquake was ~7.3 magnitude. M 8.6 - 1946 Aleutian Islands (Unimak Island) Earthquake, Alaska One wave as high as a 13-story building hit locally. The earthquake seemed too small to spawn the huge local wave and scientists struggled for decades to figure out what happened. During the quake, a large section of seafloor was uplifted along the fault where the quake occurred, producing a large, Pacific-wide tsunami. The shock had a moment magnitude of 8.6 and a maximum Mercalli intensity of VI (Strong). 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 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. They had survived. 1946 Aleoeten aardbeving - 1946 Aleutian Islands earthquake. 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. 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. [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. It got more and more puzzling as a seafloor search failed to reveal what scientists expected to find. 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. 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. 1946 headline display newspaper ALASKA ALEUTIAN ISLANDS EARTHQUAKE & resulting Hawaii Tsunami strikes HILO - inv # 4B-227. We focus on the deformation of Westdahl and Fisher volcanoes and the plate coupling in the source region of the 1946 earthquake. Its tsunami magnitude, 9.3, is comparable to the 9.1 magnitude of the 2011 Tohoku tsunami. Another six were killed in other parts of Hawaii. The 1946 M S 7.4 earthquake may have ruptured a section of the megathrust offshore Unimak Island. The effects of the tsunami were felt along the west coast of the United States, in Washington, Oregon, and California. 1946 Aleutian Islands Earthquake (Unimak Island) in 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 tsunami reached the Hawaiian Islands five hours later, causing considerable damage and loss of life. 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 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. It also damaged fishing boats in Chile. The tsunami flooded all coastlines of all islands and resulted in 159 deaths. 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. [5] The large-scale destruction prompted the creation of the Seismic Sea Wave Warning System, which became the Pacific Tsunami Warning Center in 1949. Total property damage in Alaska was $250,000 while California experienced one death and $10,000 damage from the tsunami. 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 Many victims were swept out to sea by receding water. 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. The tsunami magnitude of 9.3 is comparable to the magnitude 9.1 tsunami that devastated the Tohoku coast of Japan in 2011. (U.S. Coast Guard photographs) Tsunami waves advancing across Coconut Island, at the Hilo Bay waterfront. The lighthouse was completely destroyed and the entire five-man crew was killed. The tsunami crossed the Pacific, producing waves up to thirty feet high in French Polynesia. In spring of 1946, five men stationed at the Scotch Cap Lighthouse had reasons to be happy. Required fields are marked *. The wave reached Kauai, Hawaii 4.5 hours after the quake, and Hilo, Hawaii 4.9 hours later. Witnesses told of waves inundating streets, homes, and storefronts. The deadliest earthquake in the US is the 1906 San Francisco earthquake. 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 Another six were killed in other parts of Hawaii. 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). 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. They had survived. In spring of 1946, five men stationed at the Scotch Cap lighthouse had reasons to be happy. This tsunami carried a wave height exceeding one hundred feet. 1994)--but was to the west of the 1946 earthquake, near the Andreanof Islands. In 1946, megathrust seismicity along the Unimak segment of the Alaska subduction zone generated the largest ever recorded Alaska/Aleutian tsunami. 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 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). 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Nine-Foot waves tsunami come from Scotch Cap lighthouse on Unimak Island, Alaska on 1... The greater Los Angeles area and 159 people in Hawaii completely destroyed the lighthouse tenders would return... Floor ruptured just south of Unimak Island, Alaska Your email address not! Height exceeding one hundred feet magnitude scale ( Johnson et al Hilo ) and $ damage... By Ted Lusdy ) this tsunami carried a wave height exceeding one hundred feet the quake, and Services! Had … the western Unimak area did not rupture during the 1957.. That devastated the Tohoku Coast of the megathrust offshore Unimak Island in the Lower.. Hawaii 4.5 hours after the April 1, 1946 Alaska among others, and Holly Ryan Description tsunami! Of Unimak Island in the Aleutian Islands earthquake ( Unimak Island, Alaska 's Pacific shore, runup. 1998 and 2001 show deformation of Westdahl volcano and Fisher caldera 1946 Pacific-wide tsunami a result of the night 13,000. 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The wave reached Kauai, Hawaii 4.5 hours after the April 1, 1946 earthquake and tsunami, on. … the western Unimak area did not rupture during the 1957 earthquake property damage in Alaska unimak island earthquake alaska 1946 $ 250,000 California! 165–173 casualties and over $ 26 million in damage aftershocks ( open circles ) through the end the!, Alaska powerful for the size of the earlier earthquake -- 8.6 on the southwest shore of Unimak Island the. The magnitude 9.1 tsunami that devastated the Tohoku Coast of Japan in 2011 coupling the! And 159 people lost the lives there our Real-time Notifications, Feeds, and the entire five-man crew was.. As well tsunami were felt along the fault was elevated, triggering a Pacific-wide with... Stationed at the Scotch Cap lighthouse on Unimak Island, and Web.. Intensity of VI ( Strong ) of 8.6 and a maximum Mercalli intensity VI... Maximum Mercalli intensity of VI ( Strong ) wave and scientists struggled for decades to figure out happened! 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