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{{for|the channel in the Aleutian Islands|Amchitka Pass}}
{{for|the channel in the Aleutian Islands|Amchitka Pass}}


'''Amchitka''' is a volcanic, tectonically unstable island in the [[Rat Islands]] group of the [[Aleutian Islands]] in southwest [[Alaska]]. It is about 42 miles long, and varies from 2 to 4 miles in width. It has a maritime climate, with many storms, and mostly overcast skies.
'''Amchitka''' is a volcanic, tectonically unstable island in the [[Rat Islands]] group of the [[Aleutian Islands]] in southwest [[Alaska]]. It is about 68 kilometers long, and varies from 3 to 6 km in width.<ref name="longterm" /> It has a maritime climate, with many storms, and mostly overcast skies.


The island was populated for more than 2,500 years by the [[Aleut]] people, but has had no permanent population since 1832. It was included in the [[Alaska Purchase]] of [[1867]], and has since been part of the [[United States]]. During the [[World War II]], it was used as an airfield by US forces in the Battle of the Aleutian Islands.
The island was populated for more than 2,500 years by the [[Aleut]] people, but has had no permanent population since 1832. It was included in the [[Alaska Purchase]] of 1867, and has since been part of the [[United States]]. During the [[World War II]], it was used as an airfield by US forces in the Battle of the Aleutian Islands.


Amchitka was selected by the [[United States Atomic Energy Commission]] to be the site for [[nuclear testing|underground tests]] of nuclear weapons. Three tests were conducted: ''Long Shot'', an 80 [[kiloton]] blast in [[1965]], ''Milrow'', a 1 megaton blast in [[1969]], and ''Cannikin'', at "under 5 megatons" in [[1971]], the largest underground U.S. test ever. The tests, particularly ''Cannikin'', were controversial, with environmental groups fearing that the test would cause severe [[earthquake|earthquakes]] and [[tsunami|tsunamis]].
Amchitka was selected by the [[United States Atomic Energy Commission]] to be the site for [[nuclear testing|underground tests]] of nuclear weapons. Three tests were conducted: ''Long Shot'', an 80 [[kiloton]] blast in 1965, ''Milrow'', a 1 megaton blast in 1969, and ''Cannikin'', at "under 5 megatons" in 1971, the largest underground U.S. test ever. The tests, particularly ''Cannikin'', were controversial, with environmental groups fearing that the test would cause severe [[earthquake|earthquakes]] and [[tsunami|tsunamis]].


Amchitka is no longer used for nuclear testing, though it is monitored for leakage of radioactive materials.
Amchitka is no longer used for nuclear testing, though it is monitored for leakage of radioactive materials.
Line 36: Line 36:
|accessdate=2006-10-09}}</ref> It is bounded by the Bering Sea to the north and east, and the Pacific Ocean to the south and west.<ref name="doe_model" />
|accessdate=2006-10-09}}</ref> It is bounded by the Bering Sea to the north and east, and the Pacific Ocean to the south and west.<ref name="doe_model" />


The island varies from 2-4 miles in width, and is approximately 42 miles in length.<ref name="longterm" /> The eastern part of the island is a lowland plateau, with gently rolling hills and low but abundant vegetation, the centre of the island is mountainous, and the western end is barren and windswept.<ref name="doe_model" />
The eastern part of the island is a lowland plateau, with gently rolling hills and low but abundant vegetation, the centre of the island is mountainous, and the western end is barren and windswept.<ref name="doe_model" />


Amchitka has a maritime climate, often foggy and windswept, with cloud cover 98 percent of the time.<ref name="doe_model" /> While temperatures are moderated by the ocean, storms are frequent.<ref name="doe_remed">{{cite conference |first=Michael O. |last=Giblin |coauthors=David C. Stahl, Jodi A. Bechtel |title=Surface remediation in the Aleutian Islands: A case study of Amchitka Island, Alaska |booktitle=WM '02 Conference, Tucson AZ, February 24-28, 2002 |url=http://www.osti.gov/bridge/servlets/purl/833145-KwaGYY/native/833145.pdf |accessdate=2006-10-07}}</ref> Geologically, the island is volcanic, being a part of a small crustal block on the Aleutian Volcanic Arc that is being torn apart by oblique subduction. It is "one of the least stable tectonic environments in the United States."<ref name="geotimes">{{cite web |url=http://www.geotimes.org/mar02/feature_amchitka.html
Amchitka has a maritime climate, often foggy and windswept, with cloud cover 98 percent of the time.<ref name="doe_model" /> While temperatures are moderated by the ocean, storms are frequent.<ref name="doe_remed">{{cite conference |first=Michael O. |last=Giblin |coauthors=David C. Stahl, Jodi A. Bechtel |title=Surface remediation in the Aleutian Islands: A case study of Amchitka Island, Alaska |booktitle=WM '02 Conference, Tucson AZ, February 24-28, 2002 |url=http://www.osti.gov/bridge/servlets/purl/833145-KwaGYY/native/833145.pdf |accessdate=2006-10-07}}</ref> Geologically, the island is volcanic, being a part of a small crustal block on the Aleutian Volcanic Arc that is being torn apart by oblique subduction. It is "one of the least stable tectonic environments in the United States."<ref name="geotimes">{{cite web |url=http://www.geotimes.org/mar02/feature_amchitka.html

Revision as of 16:56, 20 October 2006

Amchitka Underground Test Site
52°6′N 177°36′W / 52.100°N 177.600°W / 52.100; -177.600
Cannikin warhead being lowered into test shaft
Location of the site
TypeNuclear testing range
Site information
OperatorUnited States Department of Energy
StatusInactive
Site history
In use1965 – 1971
Test information
Thermonuclear tests3
Remediation2001 – 2025 (DoE estimate)
For the channel in the Aleutian Islands, see Amchitka Pass.

Amchitka is a volcanic, tectonically unstable island in the Rat Islands group of the Aleutian Islands in southwest Alaska. It is about 68 kilometers long, and varies from 3 to 6 km in width.[1] It has a maritime climate, with many storms, and mostly overcast skies.

The island was populated for more than 2,500 years by the Aleut people, but has had no permanent population since 1832. It was included in the Alaska Purchase of 1867, and has since been part of the United States. During the World War II, it was used as an airfield by US forces in the Battle of the Aleutian Islands.

Amchitka was selected by the United States Atomic Energy Commission to be the site for underground tests of nuclear weapons. Three tests were conducted: Long Shot, an 80 kiloton blast in 1965, Milrow, a 1 megaton blast in 1969, and Cannikin, at "under 5 megatons" in 1971, the largest underground U.S. test ever. The tests, particularly Cannikin, were controversial, with environmental groups fearing that the test would cause severe earthquakes and tsunamis.

Amchitka is no longer used for nuclear testing, though it is monitored for leakage of radioactive materials.

Geography

Amchitka is the southernmost of the Rat Islands group in the Aleutian Chain,[1] located between 51°21′N 178°37′E / 51.350°N 178.617°E / 51.350; 178.617 and 51°39′N 179°29′E / 51.650°N 179.483°E / 51.650; 179.483.[2] It is bounded by the Bering Sea to the north and east, and the Pacific Ocean to the south and west.[2]

The eastern part of the island is a lowland plateau, with gently rolling hills and low but abundant vegetation, the centre of the island is mountainous, and the western end is barren and windswept.[2]

Amchitka has a maritime climate, often foggy and windswept, with cloud cover 98 percent of the time.[2] While temperatures are moderated by the ocean, storms are frequent.[3] Geologically, the island is volcanic, being a part of a small crustal block on the Aleutian Volcanic Arc that is being torn apart by oblique subduction. It is "one of the least stable tectonic environments in the United States."[4]

Early history

The human history of Amchitka dates back at least 2,500 years, with the Aleut people.[3][5] Human remains, thought to be of an Aleut and dating from about 1000 AD, were discovered in 1980.[6]

Amchitka is said to have been seen and named St Makarius by Bering in 1741, was sighted by Billings in 1790, and visited by Shishmaref in 1820.[7] Russian trappers and traders established settlements on the islands, exploiting the indigenous people,[8] whose population on the island quickly fell.[6] From 1832, the island was never permanently inhabited,[6] and by the time of World War II, an abandoned Russian fishing village was all that remained.[9]

The islands were surveyed by the North Pacific Exploring Expedition in 1855,[7] and were included in the Alaska Purchase of 1867.[8] In 1913, President William Taft set aside the Aleutian chain, including Amchitka, as a wildlife preserve.[9] The Native residents of Atka leased the island for fox hunting in 1920, and continued to use the island until the Japanese invasion of the western Aleutians in 1942.[6]

World War II

Further information: Battle of the Aleutian Islands

In June 1942, the Japanese occupied some of the western Aleutian islands, and hoped to occupy Amchitka.[10] Eager to remove the Japanese, the Joint Chiefs of Staff agreed to move quickly to regain the territory. American planners decided to build a series of airfields to the west of Umnak, from which bombers could attack the invading forces.[11]

The U.S. Army established bases on Adak and 13 other locations.[11] At the War Department's suggestion, an initial reconnaisance of Amitchka was carried out in September 1942, which found that it would be difficult to build an airstrip on the island.[10] Nevertheless, planners decided on December 13 that the airfield "had to be built" in order to prevent the Japanese from doing the same.[10] A further reconnaisance mission visited Amchitka from 17-19 December, and reported that a fighter strip could be built in two to three weeks, and a main airfield in three to four months.[10]

The plan would go ahead.[10] American forces made an unopposed landing on Amchitka on January 11, 1943. Despite facing difficult weather conditions and bombing from the Japanese, the airfield was usable by February 16.[10] The Alaska Command was now 50 miles away from their target, Kiska.[11] The military eventually built numerous buildings, roads, and a total of three airstrips on the island,[9] some of which would later be renovated and used by the Atomic Energy Commission.[12] At its peak, the occupancy of Amchitka reached 15,000 troops.[9]

The Aleutian Islands campaign was successfully completed on August 24, 1943.[11] In that month, a strategic intercept station was established on the island, which remained until February 1945.[13] The Army abandoned the site in August 1950.[14] The site later hosted an Air Force weather station in the 1950s, a White Alice telecommunication system in 1959 to 1961, and a temporary relay station in the 1960s and 1970s.[9]

Plans for nuclear testing

The locations of the nuclear tests

The Department of Defense initially considered the island for nuclear testing planned for 1951. Requiring information about the cratering potential of nuclear weapons, plans were made to detonate two 20-kiloton devices.[3] After drilling approximately 34 test holes, the site was deemed unsuitable,[14] and the project was moved to the Nevada test site.[3]

In the late 1950s, scientists realised that improved seismological knowledge was necessary for the detection of Soviet underground nuclear explosions.[15] The 1.7 kT "Rainier" test (part of Operation Plumbbob, performed elsewhere) produced strong seismic signals, but looked much like an ordinary earthquake. Dr Killian, the Special Assistant to the President for Science and Technology, formed the Panel on Seismic Improvement in 1959, which was to recommend the program that came to be known as Vela Uniform, with the twin goals of improving seismic instruments and deploying them globally, and researching in more depth the seismic effects of nuclear explosions.[16] The project was subsequently initiated by the Eisenhower administration.[15]

Together with the Atomic Energy Commission, the DoD began assessing Amitchka for use as part of the Vela Uniform tests.[3]

Long Shot test

This film still shows the dirt being displaced from the Long Shot underground test.

In order to conduct the Vela Uniform test on the island, Long Shot, the Department of Defense occupied Amchitka from 1964 to 1966, with the AEC providing the device, measuring instruments, and scientific support.[14] The goal was "to determine the behavior and characteristics of seismic signals generated by nuclear detonations and to differentiate them from seismic signals generated by naturally occurring earthquakes."[17]

Although it would not be publically announced until 18 March, 1965, senior Alaskan officials were notified the previous February.[18] After the devastating Great Alaska Earthquake of 27 March, 1964, the governor expressed concern about the psychological effects of the test on the populace. He was quickly reassured.[18]

Long Shot was detonated on October 29, 1965, and the yield was 80 kilotons. It was the first underground test in a remote area, and the first test managed by the DoD.[3] While there was no surface collapse,[2] tritium and krypton were found at the surface following the test;[2][19] this was not made public until 1969.[19]

Milrow and Cannikin tests

Though performed as part of the Nuclear Weapons Testing Program,[17] "[the] purpose of the Milrow test was to test an island, not a weapon."[20] It was a "calibration shot", intended to produce data from which the impact of larger explosions could be predicted, and specifically, to find whether the planned Cannikin shot could be performed safely. It was fired on 2 October, 1969, with an approximate yield of 1[2] to 1.2[21] MT.

The shockwave reached the surface with an acceleration of over 35g, causing a dome of the earth's surface, approximately 3km in radius, to rise about 5m.[22] The blast "turned the surrounding sea to froth" and "forced geysers of mud and water from local streams and lakes 50 feet into the air"[19] A "surface collapse feature" was formed by material collapsing into the cavity formed by the explosion.[2]

Cannikin was intended to test the design of the Spartan anti-ballistic missile (ABM) interceptor – a high-yield warhead that "produced copious amounts of x-rays and minimized fission output and debris to prevent blackout of ABM radar systems."[23] The test would "measure the yield of the device, measure the x-ray flux and spectrum, and assure deployment of a reliable design."[24]

Controversy

A few days after the Milrow test, the Don't Make A Wave Committee was organized in a Vancouver meeting. On the agenda was whether to fight another blast at the island, or whether to expand their efforts to fight all perceived threats against the environment. As he was leaving, one man gave the traditional farewell of the peace-activist movement, "Peace." "Make it a green peace," replied another member. The Committee would later become Greenpeace.[25]

The Committee's name referred to predictions made by a Vancouver journalist named Bob Hunter, later to become Greenpeace member 000. He wrote that the test would cause earthquakes and a tsunami.[26] The AEC considered the likelihood of the test triggering a severe earthquake "very unlikely," unless one was already imminent on a nearby fault, and considered a tsunami "even more unlikely."[12]

Others disagreed. Russell Train, then Chairman of the Council on Environmental Quality, argued that "experience with Milrow ... does not provide a sure basis for extrapolation. In the highly nonlinear phenomena involved in earthquake generation, there may be a threshhold value of the strain that must be exceeded prior to initiation of a large earthquake. ... The underground explosion could serve as the first domino of the row of dominoes leading to a major earthquake. ... as in the case of earthquakes it is not possible at this time to assess quantitatively the probability of a tsunami following the explosion."[26]

Film stills from the Cannikin test show the effects on the surface of the 5 megaton detonation below, equivalent to a 7.0 earthquake.

In July 1971, a group called the Committee for Nuclear Responsibility filed suit against the AEC, asking the court to stop the test.[27] The suit was unsuccessful, with the Supreme Court denying the injunction by 4 votes to 3,[28] and Richard Nixon personally authorised the $200 million test, in spite of objections from Japan, Peru, and Sweden.[29] The Don't Make A Wave Committee chartered a boat, in which they had intended to sail to the island in protest, but due to weather conditions they were unable to reach their destination.[25]

Cannikin tested

Cannikin was detonated on 6 November, 1971. The announced yield was "less than five" megatons – the largest underground nuclear test in US history.[19] (Estimates for the precise yield range from 4.4 MT[30] to 5.2MT.[31]) The ground lifted 20 feet, caused by an explosive force equivalent almost 400 times the power of the Hiroshima bomb.[32] Subsidence and faulting at the site created a new lake, over a mile wide.[2] The explosion caused a seismic shock of 7.0 on the Richter scale, causing rockfalls and turf slides of a total of 35,000 square feet.[19] Though earthquakes and tsunamis predicted by environmentalists did not occur,[28] a number of small tectonic events did occur in the following weeks, thought to be due to the interaction of the explosion with local tectonic stresses.[33]

1973 and beyond

The DoE withdrew from the island in 1973, though scientists continued to visit the island for monitoring purposes.[14] In 2001, the DoE returned to the site to remove environmental contamination. Drilling mud pits were stabilized by mixing with clean soil, covering with a polyester membrane, topped with soil and re-seeded.[9]

Concerns have been expressed that new fissures may be opening underground, allowing radioactive materials to leak into the ocean.[32] A 1996 Greenpeace study found that Cannikin was leaking both plutonium and americium into the environment,[19] though a 2004 University of Alaska, Fairbanks study reported that "There were no indications of any radioactive leakage, and all that was really wonderful news."[24] Similar findings are reported by a 2006 study, which found that levels of plutonium were "were very small and not significant biologically".[34]

The Department of Energy continue to monitor the site as part of their remediation program. This is expected to continue until 2025, after which the site is intended to become a restricted access wildlife preserve.[35]

Nuclear tests at Amchitka
Name Date (GMT)[36] Location[37] Yield[37] Type[37]
Long Shot1965-10-29 21:0051°26′12″N 179°10′47″W / 51.43655°N 179.17976°W / 51.43655; -179.1797680kT2343 ft shaft
Milrow1969-10-02 22:0651°24′56″N 179°10′48″W / 51.41559°N 179.17992°W / 51.41559; -179.17992~ 1MT4002 ft shaft
Cannikin1971-11-06 22:0051°28′11″N 179°06′12″W / 51.46961°N 179.10335°W / 51.46961; -179.10335< 5MT6104 ft shaft

Notes and references

  1. ^ a b Faller, S. H. (1997). "Long Term Hydrological Monitoring Program" (PDF). Department of Energy. Retrieved 2006-10-11. {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  2. ^ a b c d e f g h i Hassan, Ahmed. "Modeling Groundwater Flow and Transport of Radionuclides at Amchitka Island's Underground Nuclear Tests: Milrow, Long Shot, and Cannikin" (PDF). Retrieved 2006-10-09. {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help)
  3. ^ a b c d e f Giblin, Michael O. "Surface remediation in the Aleutian Islands: A case study of Amchitka Island, Alaska" (PDF). WM '02 Conference, Tucson AZ, February 24-28, 2002. Retrieved 2006-10-07. {{cite conference}}: Unknown parameter |booktitle= ignored (|book-title= suggested) (help); Unknown parameter |coauthors= ignored (|author= suggested) (help)
  4. ^ Eichelberger, John (2002). "Nuclear Stewardship: Lessons from a Not-So-Remote Island". GeoTimes. Retrieved 2006-10-11. {{cite web}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help)
  5. ^ Miller states "at least 9,000 years" (see Miller, Pam, "Nuclear Flashback")
  6. ^ a b c d "Federal Register: Notice of Inventory Completion: U.S. Department of the Interior, U.S. Fish and Wildlife Service, Region 7, Anchorage, AK" (PDF). 2003-12-01. Retrieved 2006-10-09.
  7. ^ a b Baker, Marcus (1902). Geographic Dictionary of Alaska (Bulletin of the United States Geological Survey, no 187, Series F, Geography, 27) (PDF). Washington: Government Printing Office. Retrieved 2006-10-09.
  8. ^ a b "Aleutian Islands". Columbia University Press. 2005. Retrieved 2006-10-08.
  9. ^ a b c d e f "Amchitka, Alaska, Site Fact Sheet" (PDF). Department of Energy Office of Legacy Management. Retrieved 2006-10-07.
  10. ^ a b c d e f Conn, Stetson (2000). Guarding the United States and its outposts. U.S. Army Center of Military History. CMH 4-2, Library of Congress no 62-60067. Retrieved 2006-10-09.
  11. ^ a b c d MacGarrigle, George L. (2003). The Campaigns of World War II: Aleutian Islands. U.S. Army Center of Military History. CMH Pub 72-6, paper, GPO S/N 008-029-00232-9. Retrieved 2006-10-07. {{cite book}}: Unknown parameter |month= ignored (help)
  12. ^ a b "Environmental Statement Cannikin". Atomic Energy Commission. Retrieved 2006-10-11.
  13. ^ "Pre-1952 Historical Timeline". National Security Agency. Retrieved 2006-10-07.
  14. ^ a b c d "Amchitka Island, Alaska: Potential U.S. Department of Energy site responsibilities (DOE/NV-526)" (PDF). Department of Energy. 1998. Retrieved 2006-10-09. {{cite web}}: Unknown parameter |month= ignored (help)
  15. ^ a b Barth, Kai-Henrik (2003). "The politics of seismology: Nuclear testing, arms control, and the transformation of a discipline". Social Studies of Science. 33 (5): 743–781. doi:10.1177/0306312703335005. {{cite journal}}: |access-date= requires |url= (help)
  16. ^ Van der Vink, Gregory E. (1994). Nuclear testing and nonproliferation: The role of seismology in deterring the development of nuclear weapons. The Iris Consortium. Retrieved 2006-10-08. {{cite book}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help)
  17. ^ a b "Project Baseline Report (NVNO0227)". 1998-01-16. Retrieved 2006-10-09.
  18. ^ a b Kohlhoff, Dean W. (2002). Amchitka and the Bomb. University of Washington Press. ISBN 0295982551. {{cite book}}: Unknown parameter |month= ignored (help)
  19. ^ a b c d e f Miller, Pam. "Nuclear Flashback: Report of a Greenpeace Scientific Expedition to Amchitka Island, Alaska – Site of the Largest Underground Nuclear Test in U.S. History" (PDF). Retrieved 2006-10-09. Cite error: The named reference "greenpeace" was defined multiple times with different content (see the help page).
  20. ^ "The Milrow Test (DOE Historical Test Film 800040)". Retrieved 2006-10-09.
  21. ^ See Miller "Nuclear Flashback" or Schneider "Amchitka's nuclear legacy".
  22. ^ Merritt, Merritt (1971). "Ground Shock and Water Pressures from Milrow". BioScience. 21 (12): 696–700. doi:10.2307/1295751. {{cite journal}}: |access-date= requires |url= (help); Unknown parameter |month= ignored (help)
  23. ^ "Accomplishments in the 1970s: Lawrence Livermore National Laboratory". Retrieved 2006-10-09.
  24. ^ a b Schneider, Doug. "Amchitka's nuclear legacy". University of Alaska Fairbanks. Retrieved 2006-10-09.
  25. ^ a b The Greenpeace Story in: The Greater Vancouver Book: An Urban Encyclopedia. Linkman Press. 1997. ISBN 1896846009. Retrieved 2006-10-09.
  26. ^ a b "The original Mr Green". The Guardian. 2005-05-04. Retrieved 2006-10-11. Cite error: The named reference "guardian" was defined multiple times with different content (see the help page).
  27. ^ "Round 2 at Amchitka". TIME. 1971-07-17. Retrieved 2006-10-09.
  28. ^ a b "The Amchitka Bomb Goes Off". TIME. 1971-11-15. Retrieved 2006-10-09.
  29. ^ "Green Light on Cannikin". TIME. 1971-11-08. Retrieved 2006-10-09.
  30. ^ Sykes, Lynn R. (1986). "Yields of Soviet Underground Nuclear Explosions at Novaya Zemlya, 1964-1976, from Seismic Body and Surface Waves". Proceedings of the National Academy of Sciences of the United States of America. 83 (2). {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help)
  31. ^ Fritz, Stacey (2000). "The Role of National Missile Defense in the Environmental History of Alaska". University of Alaska Fairbanks. {{cite web}}: Unknown parameter |month= ignored (help)
  32. ^ a b Perlman, David (2001-12-17). "Blast from the past: Researchers worry that radiation from nuclear test decades ago may be damaging marine life today". Retrieved 2006-10-11.
  33. ^ Engdahl, E. R. (1972). "Seismic effects of the MILROW and CANNIKIN nuclear explosions". Bulletin of the Seismological Society of America. 62 (6): 1411–1423. {{cite journal}}: Unknown parameter |month= ignored (help)
  34. ^ Burger, J (2006). "Radionuclides in marine macroalgae from Amchitka and Kiska Islands in the Aleutians: establishing a baseline for future biomonitoring". J Environ Radioact. PMID 17029666. {{cite journal}}: Unknown parameter |coauthors= ignored (|author= suggested) (help); Unknown parameter |month= ignored (help)
  35. ^ "Amchitka Island". Department of Energy. Retrieved 2006-10-11.
  36. ^ "United States nuclear tests: July 1945 through September 1992" (PDF). Department of Energy. Retrieved 2006-10-11.
  37. ^ a b c Johnson, Mark. "Results from the Amchitka Oceanographic Survey" (PDF). University of Alaska, Fairbanks. Retrieved 2006-10-11.

The following links are to Department of Energy films about the Amitchka test facility. The videos include footage of the tests.

Quelle: https://en.wikipedia.org/wiki/Special%3ADiff%2F82652518