Elugelab

Elugelab, or Elugelap (Marshallese: Āllokļap, [ællʲoɡʷ(o)lˠɑpʲ][1]), was an island, part of the Enewetak Atoll in the Marshall Islands. It was destroyed by the world's first true hydrogen bomb test on 1 November 1952, a test which was codenamed shot "Mike" of Operation Ivy. Prior to being destroyed, the island was described as "just another small naked island of the atoll".[2]

Enewetak Atoll, before Mike shot. Note island of Elugelab on left.
Enewetak Atoll, after Mike shot. Note crater on left.

The fireball created by Ivy Mike had a maximum diameter of 5.8 to 6.56 km (3.60 to 4.08 mi).[3][4][5] This maximum is reached a number of seconds after the detonation and during this time the hot fireball invariably rises due to buoyancy. While still relatively close to the ground, the fireball had yet to reach its maximum dimensions and was thus approximately 5.2 km (3.2 mi) wide.[6]

The detonation produced a crater 1.9 km (6,200 ft) in diameter and 50 m (160 ft) deep where Elugelab had once been;[7] the blast and water waves from the explosion (some waves up to 6.1 m (20 ft) high) stripped the test islands clean of vegetation, as observed by a helicopter survey within 60 minutes after the test, by which time the mushroom cloud had blown away. The island "became dust and ash, pulled upward to form a mushroom cloud that rose about twenty-seven miles into the sky." According to Eric Schlosser, all that remained of Elugelab was a circular crater filled with seawater, more than a mile in diameter and "fifteen stories deep".[8] The blast yielded 10.4 megatons of explosive energy, 700 times the energy that leveled central Hiroshima.[9]

Aerial footage of Elugelab and adjacent islands well before Mike shot at a time prior to the connecting causeway being created is available,[10] as is footage after the causeway was finished that supported the diagnostic Krause-Ogle box light pipe system,[11] with numerous trees removed in preparation of the shot also plainly evident,[12] along with footage of the aforementioned helicopter survey of the Mike crater soon after the detonation,[13] and finally, high-altitude footage of the crater accompanied with details of its depth—"175 feet deep"—equivalent to the height of a "17-storey building" and with an area large enough to accommodate about "14 Pentagon buildings".[14]

The detonation also collapsed some natural crevices in the reef, some distance away from the rim of the crater.[15]

Full radioecology recovery surveys were documented before and after each test series. For a brief online introduction into some of these studies—with specific reference to the ecological effects of the 1.69-megaton Operation Castle Nectar shot, detonated in 1954 on a barge just north east of the crater of the 10.4-megaton Ivy Mike thermonuclear test - see a report by the University of Washington's Laboratory of Radiation Biology and .

  • Redwing Seminole crater on Bogon/Bokon (Irene) island
  • Test shot Apache of Operation Redwing, yield 1.85 megatons,[18] detonated in a barge on July 8, 1956, at "Elugelab (Flora)" 11.66451°N 162.19446°E / 11.66451; 162.19446 (Apache) or off the coast of what remained of Teiter Island after the detonation of test shot Nectar of Operation Castle.
  • A 2002 true-color photograph of Enewetak Atoll. The relatively large Ivy Mike crater can be seen at the top of the atoll in this image with the smaller, adjoining Castle Nectar crater, in close proximity. The much smaller Redwing Seminole crater can faintly be seen on Bogon Island.
  • A single high-quality frame from test shot Seminole of Operation Redwing

See also

References

  1. Marshallese-English Dictionary - Place Name Index
  2. "Operation Ivy (1952), see 24:00".
  3. Walker, John (June 2005). "Nuclear Bomb Effects Computer". Fourmilab. Retrieved 2009-11-22.
  4. Walker, John (June 2005). "Nuclear Bomb Effects Computer Revised Edition 1962, Based on Data from The Effects of Nuclear Weapons, Revised Edition 'he maximum fireball radius presented on the computer is an average between that for air and surface bursts. Thus, the fireball radius for a surface burst is 13 percent larger than that indicated and for an air burst, 13 percent smaller'". Fourmilab. Retrieved 2009-11-22.
  5. "Mock up". Remm.nlm.gov. Retrieved 2013-11-30.
  6. "Operation Ivy (1952), see 56:50".
  7. Nuclear Weapon Archive
  8. Schlosser, Eric (2013). Command and Control: Nuclear Weapons, the Damascus Accident, and the Illusion of Safety. Penguin Press. ISBN 978-1-59420-227-8.
  9. "Soviets Stole Bomb Idea From U.S., Book Says". The New York Times. 30 December 2008. Retrieved 2008-12-29.
  10. "Operation Ivy (1952), see 23:00".
  11. "Operation Ivy 1952 - Enewetak Atoll, Marshall Islands "The 9000 foot long causeway linking the islands together is the "Krause-Ogle box", a 9 foot square aluminum-sheathed plywood tunnel filled with helium ballonets. This box allowed gamma and neutron radiation from the blast to travel with little absorption to test instruments on Bogon."".
  12. "Operation Ivy (1952), see 30:00".
  13. "Operation Ivy (1952), see 47:00".
  14. "Operation Ivy (1952), see 58:30".
  15. "Operation Ivy (1952), see 58:50 note the black lines drawn on the picture that appear momentarily at 58:55".
  16. Walker, John (June 2005). "Nuclear Bomb Effects Computer". Fourmilab. Retrieved 2009-11-22.
  17. Walker, John (June 2005). "Nuclear Bomb Effects Computer Revised Edition 1962, Based on Data from The Effects of Nuclear Weapons, Revised Edition "The maximum fireball radius presented on the computer is an average between that for air and surface bursts. Thus, the fireball radius for a surface burst is 13 percent larger than that indicated and for an air burst, 13 percent smaller. "". Fourmilab. Retrieved 2009-11-22.
  18. "DTRA Operation REDWING Fact Sheet" (PDF). Archived from the original (PDF) on 2013-02-18. Retrieved 2014-02-27.
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