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Operation Cornerstone facts for kids

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See also: List of nuclear weapons tests of the United States
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Cornerstone
Information
Country United States
Period 1988–1989
Number of tests 11
Test type underground shaft, tunnel
Max. yield 150 kilotonnes of TNT (630 TJ)
434-SAN-A880235
Scale mockup of Shot Misty Echo.

The United States's Cornerstone nuclear test series was a group of 11 nuclear tests conducted in 1988–1989. These tests followed the Operation Touchstone series and preceded the Operation Aqueduct series.

Gallery

Operation Cornerstone
  • 434-SAN-A880933

    Instrumentation for shot Misty Echo.

  • 434-SAN-A880939

    Instrumentation for shot Misty Echo

  • U12N MISTY ECHO, NEVADA TEST SITE - DPLA - 9e02c854f4da7892b0ab0e248be04ac3

    Instrumentation for shot Misty Echo.

  • DISKO ELM-TC-1 EXPERIMENTS, NEVADA TEST SITE - DPLA - ba184dcd245c456b8a8268edc380fe9f

    Experiments for shot Disko Elm.

  • 434-SAN-A890345

    Data produced by an unknown instrument during shot Misty Echo.

  • 434-SAN-A890360

    Arming and Firing (A&F) racks for shot Palisade.

United States' Cornerstone series tests and detonations
Name Date time (UT) Local time zone Location Elevation + height Delivery
Purpose		 Device Yield Fallout References Notes
Dalhart October 13, 1988 14:00:00.08 PST (–8 hrs)
 NTS Area U4u 37°05′20″N 116°03′00″W / 37.08895°N 116.05013°W / 37.08895; -116.05013 (Dalhart) 1,229 m (4,032 ft) – 639.78 m (2,099.0 ft) underground shaft,
weapons development		 150 kt
Monahans - 1 November 9, 1988 20:15:00.08 PST (–8 hrs)
 NTS Area U3lk 36°59′28″N 116°01′19″W / 36.99116°N 116.02198°W / 36.99116; -116.02198 (Monahans - 1) 1,175 m (3,855 ft) – 289.86 m (951.0 ft) underground shaft,
weapons development		 less than 20 kt Simultaneous, separate holes.
Monahans - 2 November 9, 1988 20:15:00.08 PST (–8 hrs)
 NTS Area U6i 36°59′19″N 116°01′19″W / 36.98868°N 116.02197°W / 36.98868; -116.02197 (Monahans - 2) 1,174 m (3,852 ft) + underground shaft,
weapons development		 less than 20 kt Simultaneous, separate holes.
Kawich Blue - 4 December 9, 1988 15:15:00.08 PST (–8 hrs)
 NTS Area U8n 37°10′31″N 116°05′33″W / 37.17527°N 116.09261°W / 37.17527; -116.09261 (Kawich Blue - 4) 1,357 m (4,452 ft) + underground shaft,
safety experiment		 less than 20 kt Simultaneous, same hole with white.
Kawich White - 3 December 9, 1988 15:15:00.08 PST (–8 hrs)
 NTS Area U8n 37°10′31″N 116°05′33″W / 37.17527°N 116.09261°W / 37.17527; -116.09261 (Kawich White - 3) 1,357 m (4,452 ft) – 384 m (1,260 ft) underground shaft,
safety experiment		 3 kt Simultaneous, same hole with blue.
Misty Echo December 10, 1988 20:30:00.06 PST (–8 hrs)
 NTS Area U12n.23 37°11′56″N 116°12′37″W / 37.19899°N 116.21032°W / 37.19899; -116.21032 (Misty Echo) 2,232 m (7,323 ft) – 400 m (1,300 ft) tunnel,
weapon effect		 25 kt Venting detected, 7 Ci (260 GBq)
Texarkana February 10, 1989 20:06:00.055 PST (–8 hrs)
 NTS Area U7ca 37°04′36″N 116°00′05″W / 37.07678°N 116.00137°W / 37.07678; -116.00137 (Texarkana) 1,267 m (4,157 ft) – 504.02 m (1,653.6 ft) underground shaft,
weapons development		 67 kt
Kawich Black - 1 February 24, 1989 16:15:00.08 PST (–8 hrs)
 NTS Area U2cu 37°07′43″N 116°07′22″W / 37.1285°N 116.12267°W / 37.1285; -116.12267 (Kawich Black - 1) 1,352 m (4,436 ft) – 431 m (1,414 ft) underground shaft,
safety experiment		 less than 20 kt Venting detected Simultaneous, same hole with red.
Kawich Red - 2 February 24, 1989 16:15:00.081 PST (–8 hrs)
 NTS Area U2cu 37°07′43″N 116°07′22″W / 37.1285°N 116.12267°W / 37.1285; -116.12267 (Kawich Red - 2) 1,352 m (4,436 ft) – 370 m (1,210 ft) underground shaft,
weapons development		 5 kt Venting detected, 10 Ci (370 GBq) Simultaneous, same hole with black.
Ingot March 9, 1989 14:05:00.086 PST (–8 hrs)
 NTS Area U2gg 37°08′34″N 116°04′04″W / 37.14279°N 116.06781°W / 37.14279; -116.06781 (Ingot) 1,280 m (4,200 ft) – 500 m (1,600 ft) underground shaft,
weapons development		 33 kt
Palisade - 1 May 15, 1989 13:10:00.087 PST (–8 hrs)
 NTS Area U4at 37°06′27″N 116°07′18″W / 37.10756°N 116.12176°W / 37.10756; -116.12176 (Palisade - 1) 1,338 m (4,390 ft) – 345.22 m (1,132.6 ft) underground shaft,
weapons development		 5 kt Venting detected, 2 Ci (74 GBq) Simultaneous, same hole.
Palisade - 2 May 15, 1989 13:10:00.09 PST (–8 hrs)
 NTS Area U4at 37°06′27″N 116°07′18″W / 37.10756°N 116.12176°W / 37.10756; -116.12176 (Palisade - 2) 1,338 m (4,390 ft) – 392 m (1,286 ft) underground shaft,
safety experiment		 less than 20 kt Venting detected Simultaneous, same hole.
Palisade - 3 May 15, 1989 13:10:00.09 PST (–8 hrs)
 NTS Area U4at 37°06′27″N 116°07′18″W / 37.10756°N 116.12176°W / 37.10756; -116.12176 (Palisade - 3) 1,338 m (4,390 ft) – 404 m (1,325 ft) underground shaft,
safety experiment		 8 kt Venting detected Simultaneous, same hole.
Tulia May 26, 1989 18:07:00.021 PST (–8 hrs)
 NTS Area U4s 37°05′09″N 116°03′24″W / 37.08587°N 116.05665°W / 37.08587; -116.05665 (Tulia) 1,230 m (4,040 ft) – 397.8 m (1,305 ft) underground shaft,
weapons development		 500 t
Contact June 22, 1989 21:15:00.83 PST (–8 hrs)
 NTS Area U20aw 37°16′58″N 116°24′47″W / 37.28282°N 116.41319°W / 37.28282; -116.41319 (Contact) 1,980 m (6,500 ft) – 544.1 m (1,785 ft) underground shaft,
weapons development		 60 kt
Amarillo June 27, 1989 15:30:00.02 PST (–8 hrs)
 NTS Area U19ay 37°16′31″N 116°21′16″W / 37.27541°N 116.35444°W / 37.27541; -116.35444 (Amarillo) 2,019 m (6,624 ft) – 640.1 m (2,100 ft) underground shaft,
weapons development		 20 kt
Disko Elm September 14, 1989 15:00:00.098 PST (–8 hrs)
 NTS Area U12p.03 37°14′09″N 116°09′49″W / 37.23589°N 116.16374°W / 37.23589; -116.16374 (Disko Elm) 1,917 m (6,289 ft) – 260 m (850 ft) tunnel,
weapon effect		 10 kt Venting detected, 0.5 Ci (19 GBq)
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