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1957 Andreanof Islands Earthquake
The 1957 Andreanof Islands earthquake occurred at 04:22 local time on March 9 with a moment magnitude scale, moment magnitude estimated at 8.6 and a maximum Modified Mercalli intensity scale, Modified Mercalli intensity of VIII (''Severe''). It occurred south of the Andreanof Islands group, which is part of the Aleutian Islands arc. The event occurred along the Aleutian Trench, the Convergent boundary, convergent plate boundary that separates the Pacific plate and the North American plates near Alaska. A basin-wide tsunami followed, with effects felt in Alaska and Hawaii, and strong waves recorded across the Pacific rim. Total losses were around United States dollar, $5 million (). Tectonic setting The Aleutian Islands lie between Kamchatka and mainland Alaska. They were formed as the result of the long convergent boundary that accommodates the subduction of the oceanic Pacific plate underneath the continental North American plate. This oceanic trench runs from the Kuril-Kamchat ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Aleutian Trench
The Aleutian Trench (or Aleutian Trough) is an oceanic trench along a convergent plate boundary which runs along the southern coastline of Alaska and the Aleutian islands. The trench extends for from a triple junction in the west with the Ulakhan Fault and the northern end of the Kuril–Kamchatka Trench, to a junction with the northern end of the Queen Charlotte Fault system in the east. It is classified as a "marginal trench" in the east as it runs along the margin of the continent. The subduction along the trench gives rise to the Aleutian Arc, a volcanic island arc, where it runs through the open sea west of the Alaska Peninsula. As a convergent plate boundary, the trench forms part of the boundary between two tectonic plates. Here, the Pacific plate is being subducted under the North American plate at a dip angle of nearly 45°. The rate of closure is per year. The Pacific plate subducting under the North American plate, leads to increased faulting. This subductio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Wainiha, Hawaii
Wainiha is a community section in the Hanalei district of northern Kauai. It had a total population of 419 at the 2020 census. Geography Wainiha is on the northern coast of Kauai Kauai (), anglicized as Kauai ( or ), is one of the main Hawaiian Islands. It has an area of 562.3 square miles (1,456.4 km2), making it the fourth-largest of the islands and the 21st-largest island in the United States. Kauai lies 73 m ... and includes a bay and canal. The terrain is varied and also includes a cliff (''pali''), river, and valley. Wainiha is 25.49 square miles. The Lumaha'i River enters the sea just to the east at Lumahai Beach. Community demographics According to the 2010 census, Wainiha is home to 318 people. The population density is 14 people per square mile. The median household income is $53,097. Etymology The name is Hawaiian and literally translates to "unfriendly water", probably referring to the coastline's treacherous currents.Pukui, Mary Kawena. ''Place Name ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hāʻena, Kauai County, Hawaii
Hāʻena is an unincorporated community and census-designated place on the island of Kauai in Kauai County, Hawaii, United States. Its population was 550 as of the 2020 census. Hāʻena is on the island's north side, along Hawaii Route 560. Geography Hāʻena is located at . According to the U.S. Census Bureau The United States Census Bureau, officially the Bureau of the Census, is a principal agency of the U.S. federal statistical system, responsible for producing data about the American people and economy. The U.S. Census Bureau is part of the U ..., it has an area of , all land. References Populated places on Kauai Unincorporated communities in Kauai County, Hawaii Unincorporated communities in Hawaii Census-designated places in Kauai County, Hawaii Populated coastal places in Hawaii {{Hawaii-geo-stub ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bowers Ridge
The Bowers Ridge is located in the southern part of the Aleutian Basin. It extends over in an arc, starting in the southeast at the Aleutian Arc The Aleutian Arc is a large volcanic arc of islands extending from the Southwest tip of the U.S. state of Alaska to the Kamchatka Peninsula of the Russian Federation. It consists of a number of active and dormant volcanoes that have formed as a ... and terminating to the northwest at the Shirshov Ridge. The Bowers Ridge arc separates the Aleutian Basin from the Bowers Basin, which it encloses. The ridge is not currently seismically active. The northern slope of the ridge is steeper than the southern slope. On the Aleutian side, the ridge is rimmed by a trough filled with a sedimentary sequence 9–10 km thick.E. V. Verzhbitsky, M. V. Kononov, and V. D. Kotelkin; Plate Tectonics of the Northern Part of the Pacific Ocean; Oceanology; 2007; Vol. 47; No. 5; pp. 705–717; The average age of the Bowers Ridge is about 30 My (Late O ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2004 Indian Ocean Earthquake And Tsunami
On 26 December 2004, at 07:58:53 local time ( UTC+7), a major earthquake with a magnitude of 9.2–9.3 struck with an epicentre off the west coast of Aceh in northern Sumatra, Indonesia. The undersea megathrust earthquake, known in the scientific community as the Sumatra–Andaman earthquake, was caused by a rupture along the fault between the Burma plate and the Indian plate, and reached a Mercalli intensity of IX in some areas. A massive tsunami with waves up to high, known as the Boxing Day Tsunami after the Boxing Day holiday, or as the Asian Tsunami, devastated communities along the surrounding coasts of the Indian Ocean, killing an estimated 227,898 people in 14 countries, violently in Aceh (Indonesia), and severely in Sri Lanka, Tamil Nadu (India), and Khao Lak (Thailand). The direct result was major disruption to living conditions and commerce in coastal provinces of surrounding countries. It is the deadliest natural disaster of the 21st century, one of the d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Umnak Island
Umnak (; ) is one of the Fox Islands of the Aleutian Islands. With of land area, it is the third largest island in the Aleutian archipelago and the 19th largest island in the United States. The island is home to a large volcanic caldera on Mount Okmok and the only field of geysers in Alaska. It is separated from Unalaska Island by Umnak Pass. In 2000, Umnak was permanently inhabited by only 39 people and by 2010, around 18, placing the settlement of Nikolski in difficulty and its school was closed. History The earliest known settlement on Umnak Island is at Anangula and is 8,400 years old. Anangula was later abandoned and the Sandy Beach site became occupied, along with Idaliuk and Chaluka. Most of the early settlements on Umnak were located along the streams. A major geologic event was the cutting of strand flats during the Hypsithermal period, about 8250 to 3000 years ago, which led to a greater natural food supply on the island for the settlers. Umnak Island was first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Adak Island
Adak Island (, ; ) or Father Island is an island near the western extent of the Andreanof Islands group of the Aleutian Islands in Alaska. Alaska's southernmost city, Adak, is located on the island. The island has a land area of , measuring long and wide, making it the 25th largest island in the United States. Due to harsh winds, frequent cloud cover, and cold temperatures, vegetation is mostly tundra (grasses, mosses, berries, low-lying flowering plants) at lower elevations. The highest point is Mount Moffett, near the northwest end of the island, at an elevation of 3,924 feet (1,196 m). It is snow covered the greater part of the year. Adak is its largest and principal city. The word ''Adak'' is from the Aleut word ''adaq'', which means "father". History Adak Island has been the home to Aleut peoples since antiquity. Russian explorers in the 18th century also visited the island but made no permanent settlements. During World War II, the Imperial Japanese Army took contro ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Queen Charlotte Fault
The Queen Charlotte Fault is an active transform fault on the boundary between the North American plate and Pacific plates. It is Canada's right-lateral strike-slip equivalent to the San Andreas Fault to the south in California. The Queen Charlotte Fault forms a triple junction at its southern with the Cascadia subduction zone and the Explorer Ridge (the Queen Charlotte triple junction). The Queen Charlotte Fault (QCF) forms a transpressional plate boundary, and is as active as other major transform fault systems (such as San Andreas or Alpine) in terms of slip rates and seismogenic potential. It sustains the highest-known deformation rates among continental or continent-ocean transform systems globally, accommodating more than 50 mm/yr of dextral offset. The entire offshore length has ruptured in seven magnitude 7+ events during the last century, making the cumulative historical seismic moment release higher than any other modern transform plate boundary system. The fau ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2017 Komandorski Islands Earthquake
On July 18, 2017, an earthquake struck near the Komandorski Islands, east of the Kamchatka Peninsula in the Bering Sea at 11:34 local time (23:34 UTC on July 17). Although there were no casualties from this earthquake, it was notable for a rare characteristic known as supershear, and is one of the few times a large supershear earthquake has been observed. It was preceded by a few foreshocks months earlier, and aftershocks that continued for nearly six months. Tectonic setting The 7.8 earthquake nucleated along the Bering fracture zone, parallel to the Aleutian Islands arc and Aleutian Subduction Zone. This is a transform fault between the Pacific and North American plates, and in between, the Komandorski Sliver. Formed from the highly oblique movement of the Pacific plate, the direction of convergence is nearly parallel to the trench at 7.8 mm/yr. The Bearing Fracture Zone acts as a back-arc fault to accommodate the lateral motion at a rate of 5.1 mm/yr. The sa ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Commander Islands
The Commander Islands, Komandorski Islands, or Komandorskie Islands (, ''Komandorskiye ostrova'') are a series of islands in the Russian Far East, a part of the Aleutian Islands, located about east of the Kamchatka Peninsula in the Bering Sea. Treeless and sparsely populated, the islands consist of Bering Island, ; Medny Island, ; and fifteen islets and rocks. The largest of the latter are Tufted Puffin Rock ''(Kamen Toporkov'' or ''Ostrov Toporkov)'', , and Kamen Ariy, which are between west of the only settlement, Nikolskoye. Administratively, the Commanders compose the Aleutsky District of the Kamchatka Krai in Russia. In 2005, the Comandorsky State Nature Reserve was nominated for the List of World Heritage Sites in Russia of UNESCO. Geography The Commander Islands archipelago consists of 15 islands and is a part of a submarine volcanic ridge extending from Alaska to Kamchatka dated by the beginning of Paleogene (60-70 million years ago). The islands are the w ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1965 Rat Islands Earthquake
The 1965 Rat Islands earthquake occurred at 05:01 UTC, on 4 February (19:01, 3 February local time). It had a magnitude of 8.7, making it one of the largest earthquakes in recorded history, and triggered a tsunami of over 10 m on Shemya Island, but caused very little damage. Tectonic setting The Rat Islands form part of the Aleutian Islands, a chain of volcanic islands forming an island arc, that results from the subduction of the Pacific plate beneath the North American plate. This plate boundary, the Aleutian Trench, has been the location of many megathrust earthquakes. Characteristics The 1965 Rat Islands earthquake share common features with the 1963 Kuril Islands earthquake and the 1964 Alaska earthquake. Earthquake The earthquake was associated with a 600 km long rupture along the plate boundary, based on the distribution of aftershocks. The pattern of energy release suggest the presence of three asperities along the plate interface, each causing a pulse of momen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
