WORLDWIDE TESTING IN JANUARY

JANUARY 1ST

No nuclear weapons tests were conducted by any country anywhere in the world on this day.

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JANUARY 2ND

No nuclear weapons tests were conducted by any country anywhere in the world on this day.

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JANUARY 3RD

U.S. tests: 1

Total yield: 600 kilotons.

The Details:1976 – ‘Muenster’detonated in a vertical shaft 4,765 feet (1,452m) beneath Pahute Mesa area U19 at 19:15 GMT with a yield of 800 kilotons from the LLNL weapons development device, a B83 thermonuclear bomb, during Operation Anvil, causing a 6.2 magnitude ground shock. 787th U.S. test.

Coordinates: 37.2965, -116.33407.

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JANUARY 4TH

Russian tests: 1

Total yield: 1.3 kilotons.

The Details:1958 – ‘Joe-44’detonated 1,200 feet (400m) above Ground Zero, Semipalatinsk at an unspecified time with a yield of 1.3 kilotons from the weapons development device after being air-dropped. 50th Russian test.

Coordinates: 50.4, 77.8.

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JANUARY 5TH

U.S. tests: 1

Total yield: <20 kilotons.

The Details:1972 – ‘Mescalero’detonated in a vertical shaft 394 feet (120m) beneath Yucca Flat at 15:10 GMT with a yield of <20 kilotons from the LANL weapons development device during Operation Grommet. 691st U.S. test.

Coordinates: 37.04565, -116.03032.

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JANUARY 6TH

No nuclear weapons tests were conducted by any country anywhere in the world on this day.

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JANUARY 7TH

Russian tests: 1

Chinese tests: 1

Total yield: 15.5 kilotons.

The Details:1968 – ‘290’ detonated in a tunnel within Degelen Mountain, Semipalatinsk at 03:46 GMT with a yield of 7.5 kilotons from the peaceful research device, causing a 4.98 magnitude ground shock and venting unknown radionuclides. 280thRussian test. Coordinates: 49.7544, 78.0309.1972 – ‘CHIC-13’detonated over Area D, Lop Nor, China at 07:00 GMT with a yield of 8 kilotons from the weapons development device, a composite core implosion tactical warhead, after being air-dropped from a Qiang-5 attack jet. 13th Chinese test.

Coordinates: 41.5, 88.5.

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JANUARY 8TH

No nuclear weapons tests were conducted by any country anywhere in the world on this day.

JANUARY 9TH

U.S.  tests: 1
Total yield: 5.1 kilotons.
The Details:
1962 – ‘Stoat’detonated in a vertical shaft 992 feet (302m) beneath Yucca Flat area U3 at 16:30 GMT with a yield of 5.1 kilotons from the weapons development device during Operation Nougat, causing a 4.2 magnitude ground shock, creating a 600 foot (183m) diameter subsidence crater and venting eight curies of gaseous fission products including Iodine-131 from a sampling line after collapse of the subsidence crater. Radiation was detected off-site near Lathrop Wells and Highway 95, 40 miles from surface ground zero.  205thU.S. test. Coordinates: 37.04459, -116.03592.
Side Note: This was the first in a series of tests to develop a new multi-point detonation system.

JANUARY 10TH

U.S. tests: 1 (3 devices)
Russian tests: 1
Total yield: 0.5 kilotons
The Details:
1974 -‘Pinodrops-Sloat’, ‘Pinodrops –Tawny’, and ‘Pinodrops-Bayou’ detonated simultaneously in the same vertical shaft 1,125 feet (343m) beneath Yucca Flat area U10 at 15:38 GMT with a combined yield of <20 kilotons from the three LLNL weapons development devices during Operation Arbor, venting 6 curies of Xenon from a ventilation line during drill-back operations two days later on January 12. 742nd U.S. test. Coordinates: 37.17407, -116.05167.
1979 - ‘625- Galit’ detonated in a vertical shaft 2,000 feet (600m) beneath Atyrau, Kazakhstan at 08:00 GMT with a yield of 500 tons as part of an industrial cavity formation experiment for gas storage, far below predicted yield, a probable fizzle. 512th Russian test. Coordinates: 47.909, 47.912.

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JANUARY 11TH

No nuclear weapons tests were conducted by any country anywhere in the world on this day.

JANUARY 12TH

No nuclear weapons tests were conducted by any country anywhere in the world on this day.
Side Note: This was the sixth day of the year no nuclear tests were conducted.

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JANUARY 13TH

U.S. tests: 1
Total yield: <20 kilotons
The Details:
1966 - ‘Maxwell’detonated in a vertical shaft 600 feet (183m) beneath Yucca Flat area U9 at 15:37 GMT with a yield of <20 kilotons from the LLNL weapons development device during Operation Flintlock, venting 3 curies of Xenon for a period of 4 days during drill-back operations.  436th U.S. test.

Coordinates: 37.11617, -116.0284.

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JANUARY 14TH

U.S. tests: 1
Total yield: 7 kilotons.
The Details:
1965 - ‘Wool’detonated in a vertical shaft 705 feet (215m) beneath Yucca Flat area U9 at 16:00 GMT with a yield of 7 kilotons from the LLNL weapons development device during Operation Whetstone, creating a 449 foot (137m) diameter subsidence crater and venting 200 curies of Xenon and Iodine from the surface ground zero casing for 2-1/2 hours and ventilation system for over three days during drill-back operations. 397th U.S test.

Coordinates: 37.11895, -116.02565.

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JANUARY 15TH

U.S. tests: 3
Russian tests: 2
Total yield: 302 kilotons.
The Details:
1965 – ‘Chagan’detonated in a vertical shaft 584 feet (178m) beneath Balapan, Semipalatinsk at 06:00 GMT with a yield of 140 kilotons from the device as part of an industrial earth moving experiment, causing a 5.87 magnitude ground shock and blowing a 1,339 foot (408m) wide, 328 foot (100m) deep hole in the ground. 231st Russian test. Coordinates:  49.9354, 79.008473.
Side Note: ‘Chagan’was the first use of nuclear explosives for industrial purposes conducted by Russia. The resulting large hole filled with water from an adjacent lake. Chagan Lake and the surrounding area remain radioactive today. ‘Chagan’ was similar to the U.S. ‘Sedan’ test which also used a large nuclear device to blow a large hole in the earth at the Nevada Test Site.  Both for peaceful purposes, of course.
1969 - ‘Packard’ detonated in a vertical shaft 810 feet (256m) beneath Yucca Flat area U2 at 19:00 GMT with a yield of 10 kilotons from the LLNL device as part of a weapons effects test during Operation Bowline, creating a 351 foot (107m) diameter subsidence crater and venting 7.2 curies of fission products from surface ground zero for a period of 15 minutes.  582nd U.S. test. Coordinates: 37.14787, -116.06654.
-- Thirty minutes later at 19:30 GMT, ‘Wineskin’detonated in a vertical shaft 1,700 feet (518m) beneath Rainier Mesa with a yield of 40 kilotons from the LLNL weapons development device, causing a 5.3 magnitude ground shock. 583rd U.S. test. Coordinates: 37.20909, -116.22627.
1976 - ‘507’detonated in a tunnel with Degelen Mountain, Semipalatinsk at 04:46 with a yield of 13 kilotons from the weapons development device, causing a 5.18 magnitude ground shock. 436thRussian test. Coordinates:
1981 – ‘Baseball’detonated in a vertical shaft 1,850 feet (564m) beneath Yucca Flat area U7 at 20:25 GMT with a yield of 99 kilotons from the LANL weapons development device during Operation Guardian, causing a 5.7 magnitude ground shock and creating a 492 foot (150m) diameter subsidence crater. 882nd U.S. test. Coordinates: 37.08675, -116.04585.

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JANUARY 16TH

U.S. tests: 1
Total yield: 38 kilotons.
The Details:
1964 - ‘Fore’ detonated in a vertical shaft 1,609 feet (490m) beneath Yucca Flat area U9 at 16:00 GMT with a yield of 38 kilotons from the LLNL weapons development device during Operation Niblick, causing a 5.2 magnitude ground shock, creating a 1,040 foot (317m) diameter subsidence crater and venting 1,200 curies of Xenon for a period of 28 hours from the ventilation system during drill-back operations. 350th U.S. test. Coordinates: 37.14205, -116.05014.

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JANUARY 17TH

Russian tests: 2
Total yield: 68.5 kilotons.
The Details:
1958 - ‘54’detonated 1,600 feet (500m) above Ground Zero, Semipalatinsk at an unspecified time with a yield of5 tons from the weapons development device after being air-dropped. 51st Russian test. Coordinates: 50.4, 77.8.
1979 - ‘626’and ‘627’(Halite – 1 and Halite – 2) detonated simultaneously in a vertical shaft 3,280 feet (1,000m) beneath Atyrau, Kazakhstan at 07:59 GMT  with yields of 12 kilotons and 56 kilotons respectively as part of an industrial cavity formation experiment, causing a 6.0 magnitude ground shock. 513th Russian test.  

Coordinates: 47.91873, 48.12376.

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JANUARY 18TH

U.S. tests: 6
Total yield: 55.96 kilotons.
The Details:
1956 – ‘Project 56 - Number 4’ detonated on the dry surface of Frenchman Flat area 11 at 21:30 GMT with a yield of 10 tonsfrom the LANL W-28 primary. This was a one-point safety test which failed. Six “Zipper” neutron initiators were used which generated an excess of neutrons in what would otherwise have been a just-barely-critical device if only one initiator were used.   68thU.S. test. Coordinates: 36.97135, -115.95539.
Side Note: This was the final test of Project 56, a series of four plutonium dispersal/one-point safety tests which spread plutonium over a large area of Frenchman Flat. The area remains contaminated with Alpha emitting weapons grade plutonium.
1962 - ‘Aqouti’ detonated in a vertical shaft 856 feet (260m) beneath Yucca Flat area U3 at 18:00 GMT with a yield of 6.4 kilotons from the LANL weapons development device during Operation Nougat, causing a 4.5 magnitude ground shock and creating a 600 foot (184m) diameter subsidence crater. 206th U.S. test. Coordinates: 37.0472, -116.03523.
1966 - ‘Lampblack’ detonated in a vertical shaft 1,842 feet (561m) beneath Yucca Flat area U7 at 18:35 GMT with a yield of 38 kilotons from the LANL weapons development device during Operation Flintlock, causing a 5.2 magnitude ground shock. 437thU.S. test. Coordinates: 37.09165, -116.01956.
-- At the same moment, ‘Sienna’ detonated in a separate vertical shaft 902 feet (275m) beneath Yucca Flat area U3 with a yield of 4 kilotons from the LANL weapons development device, creating a 328 foot (100m) diameter subsidence crater. 438th U.S. test. Coordinates: 37.03726, -116.01922.
1967 - ‘Rivet 1’ detonated in a vertical shaft 499 feet (152m) beneath Yucca Flat area U10 at 14:55 GMT with a yield of 0.15 kilotons from the LLNL weapons development device during Operation Latchkey, causing a 3.2 magnitude ground shock. 484th U.S. test. Coordinates: 37.16507, -116.04742.
1968 - ‘Hupmobile’detonated in a vertical shaft 810 feet (246m) beneath Yucca Flat area U2 at 16:30 GMT with a yield of 7.4 kilotonsfrom the LLNL device as part of a weapons effects test during Operation Crosstie, creating a 252 foot (77m) diameter subsidence crater and venting 120,000 curies of Krypton, Rubidium, Iodine, and Xenon from the line-of-sight pipe at surface ground zero beginning 1 minute after detonation and lasting one hour and 40 minutes. Radiation was tracked off-site and Iodine-131 was detected in cow milk and feed. 526th U.S. test.

Coordinates: 37.14554, -116.06654.

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JANUARY 19TH

U.S. tests: 3
Russian tests: 1
Total yield: 1,099 kilotons.
The Details:
1957 - ‘37’detonated atop a R-5M rocket 34,021 feet (10,370m) above Missile Test Range, Western Kazakhstan at an unspecified time with a yield of 10 kilotons after being launched from Kapustin Yar, Astrakhan. 34th Russian test.
Launch Coordinates: 48.56956, 45.90346
Detonation Coordinates: 49.5, 48.
1967 - ‘Nash’detonated in a vertical shaft 1,193 feet (363m) beneath Yucca Flat area U2 at 16:45 GMT with a yield of 39 kilotons from the LLNL weapons development device during Operation Latchkey, causing a 5.4 magnitude ground shock, creating a 492 foot (150m) subsidence crater and venting 69,000 curies of Krypton, Iodine, and Xenon from surface ground zero over a period of 41 hours following detonation. 485th U.S. test. Coordinates: 37.1437, -116.13619.
1968 - ‘Staccato’detonated in a vertical shaft 1,455 feet (443m) beneath Yucca Flat area U10 at 15:00 GMT with a yield of 50 kilotons from the LLNL weapons development device during Operation Crosstie, creating a 879 foot (268) diameter subsidence crater and venting 8 curies of Xenon over a period of 27 hours during drill-back operations. 527th U.S. test. Coordinates: 37.15633, -116.05475.
1968 - ‘Faultless’ detonated in a vertical shaft 3,215 feet (980m) beneath Hot Creek Valley in Central Nevada at 18:15 GMT with a yield of 1,000 kilotons  from the LLNL weapons development device during Operation Crosstie, causing a 6.3 magnitude ground shock. 528th U.S. test. Coordinates: 38.63421, -116.21622.

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JANUARY 20TH

U.S. tests: 1
Total yield: 41 kilotons
The Details:
1967 - ‘Bourbon’ detonated in a vertical shaft 1,836 feet (559m) beneath Yucca Flat area U7 at 17:40 GMT with a yield of 41 kilotons from the LANL weapons development device during Operation Latchkey, causing a 5.3 magnitude ground shock and creating a 36 foot (11m) diameter subsidence crater. 486th U.S. test.

Coordinates: 37.09981, -116.0047.

JANUARY 21ST

U.S. tests: 1
Total yield: 7 kilotons
The Details:
1966 – ‘Dovekie’ detonated in a vertical shaft 1,092 feet (333m) beneath Yucca Flat area U3 at 18:28 GMT with a yield of 7 kilotons from the LANL weapons development device during Operation Flintlock, creating a 462 foot (141m) diameter subsidence crater. 439th U.S. test.

Coordinates: 37.0318, -116.01649.

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JANUARY 22ND

U.S. tests: 2
Russian tests: 1 (2 devices)
Total yield: 120.15 kilotons
The Details:
1966 - ‘Reo’detonated in a vertical shaft 700 feet (213m) beneath Yucca Flat area U10 at 15:17 GMT with a yield of 0.15 kilotonsfrom the LLNL weapons development device during Operation Flintlock, causing a 3.2 magnitude ground shock and venting Xenon from surface ground zero cables for 15 minutes and for a period of 4.5 hours during drill-back operations. 440thU.S. test. Coordinates: 37.15718, -116.03959.
1969 - ‘Shave’detonated in a vertical shaft 789 feet (240m) beneath Yucca Flat area U3 at 15:00 GMT with a yield of 2 kilotons from the LANL weapons development device during Operation Bowline, causing a 4.1 magnitude ground shock. 584thU.S. test. Coordinates: 37.01544, -115.99516.
1989 - '964' and '965' detonated simultaneously in a vertical shaft beneath Balapan, Semipalatinsk at 03:57 GMT with a combined yield of 118 kilotons from the two weapons development devices, causing a 6.1 magnitude ground shock. 708th Russian test. Coordinates: 49.94029, 78.81603.

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JANUARY 23RD

Chinese tests: 1
Total yield: 18.5 kilotons.
The Details:
1964 - ‘Oconto’ detonated in a vertical shaft 868 feet (264m) beneath Yucca Flat area U9 at 16:00 GMT with a yield of 10.5 kilotons from the LLNL weapons development device during Operation Niblick, causing a 4.2 magnitude ground shock, creating a 961 foot (293m) diameter subsidence crater, and venting 30,000 curies of Xenon and Iodine for a period of 26 hours during drill-back operations and were detected off-site. 351st U.S. test. Coordinates: 37.12637, -116.0372.
1970 - ‘Fob-Green’, ‘Fob-Red’, and ‘Fob-Blue’detonated simultaneously in separate but adjacent vertical shafts 875 feet (266m) beneath Yucca Flat area U9 with varying yields from the three weapons development devices during Operation Mandrel, causing a 4.6 magnitude ground shock. 628th U.S. test.
‘Fob-Green’ Coordinates: 37.14066, -116.03764, Yield: 8 kilotons, 249 foot (76m) subsidence Crater
‘Fob-Red’  Coordinates: 37.13737, -116.03765, Yield: <20 kilotons
‘Fob-Blue’  Coordinates: 37.14063, -116.03351, Yield: <20 kilotons
1976 - China detonated a warhead on Area D, Lop Nor at 06:00 GMT with an undetermined yield. 18th Chinese test. Coordinates: 41.5, 88.5.

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JANUARY 24TH

U.S. tests: 2
Total yield: 6 kilotons.
The Details:
1968 - ‘Brush’ detonated in a vertical shaft 388 feet (118m) beneath Yucca Flat area U3 at 15:00 GMT with a yield of <20 kilotons from the LANL weapons development device during Operation Crosstie. 529th U.S. test. Coordinates: 37.04277, -116.01466.
1979 - ‘Baccarat’ detonated in a vertical shaft 1,071 feet (326m) beneath Yucca Flat area U7 at 18:00 GMT with a yield of 6 kilotons from the LANL weapons development device during Operation Quicksilver, causing a 4.5 magnitude ground shock. 849th U.S. test. Coordinates: 37.10536, -116.01253.

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JANUARY 25TH

No nuclear weapons tests were conducted anywhere in the world by any country on this day.

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JANUARY 26TH

U.S. tests: 2
Total yield: 3.1 kilotons.
The Details:
1967 - ‘Rivet II’ detonated in a vertical shaft 648 feet (197m) beneath Yucca Flat area U10 at 16:30 GMT with a yield of 800 tons from the LLNL weapons development device during Operation Latchkey, causing a 3.8 magnitude ground shock and venting Xenon from surface ground zero over a period of 20 minutes after detonation.  487th U.S. test. Coordinates: 37.16507, -116.04742.
1968 - ‘Cabriolet’ detonated 179 feet (52m) beneath Pahute Mesa area U20 at 16:00 GMT with a yield of 2.3 kilotons from the LLNL peaceful research device during Operation Crosstie, blowing a 357 foot (109m) diameter crater in the earth and venting 220,000 curies of mixed radionuclides including Krypton, Rubidium, Strontium, Iodine, Xenon, and Tellurium into the atmosphere which drifted off-site over southern Idaho and as far as Big Timber Mountain, Montana. 630 picocuries of Iodine-131 per liter of milk was detected nearly 400 miles north of the Nevada Test Site in Wells, Nevada. 530th U.S. test. Coordinates: 37.28079, -116.51544.

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JANUARY 27TH

U.S. tests: 1
French tests: 1
Total yield: 47 kilotons.
The Details:
1951 - ‘Able’ detonated 1,060 feet (320m) above Frenchman Flat at 13:44 GMT with a yield of 1 kiloton from the LANL weapons development device after being dropped by a B-50 bomber during Operation Ranger (originally named Operation Faust), releasing 1.3 million curies of Iodine-131 into the atmosphere. 7th U.S. test. Coordinates: 36.82664, -115.95883.
Side Note:  ‘Able’ was the first nuclear detonation conducted at the Nevada Test Site, originally known as the Las Vegas Bombing and Gunnery Range, then as the Nevada Proving Ground, then as the Nevada Test Site and now the Nevada National Security Site or N2S2 for short.  What’s in a name?
Post Cold War Side Note:  It is ironic that during the 112th Congress, Senate Resolution 330 was passed designating this day - January 27 - as  Downwinders Day,  "A national day of remembrance for Americans who, during the Cold War, worked and lived downwind from nuclear testing sites and were adversely affected by the radiation exposure generated by the above ground nuclear weapons testing.”
'Adversely affected' means many people, including children, got sick and died from radiation induced cancers from the fallout that drifted over them. But they were told there was no problem. "Everything's OK."
1996 - ‘Xouthos’ detonated in a vertical shaft beneath Fangataufa Atoll lagoon at 21:29 GMT with a yield of 46 kilotons from the weapons development device, a TN-75 SLBM thermonuclear warhead. 210th and final French nuclear weapons test. Coordinates: -22.22243, -138.74234.

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JANUARY 28TH

U.S. tests: 2
Total yield: 147 kilotons.
The Details:
1951 - ‘Baker’ detonated 1,079 feet (330m) over Frenchman Flat Area 5 at 13:52 GMT with a yield of 8 kilotons from the LANL Mk-4 weapons development device after being air-dropped during Operation Ranger, spewing 3.2 million curies of Iodine-131 into the atmosphere along with other radionuclides. 8th U.S. detonation. Coordinates: 36.82664, -115.95883.
Side Note: Three military personnel were exposed to radiation exceeding 3.0 roentgens: 5.32, 3.4 and 3.21 roentgens during Operation Ranger.
1982 - ‘Jornada’ detonated in a vertical shaft 2,096 feet (638m) beneath Yucca Flat area U4 at 16:00 GMT with a yield of 139 kilotons from the LANL weapons development device during Operation Praetorian, causing a 5.9 magnitude ground shock and creating a 984 foot (300m) diameter subsidence crater. At detonation, a 202 foot (61m) diameter cavity was created at the shot point before collapsing in on itself and creating the subsidence crater. 899thU.S. test. Coordinates: 37.09129, -116.0521.

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JANUARY 29TH

U.S. tests: 1
Russian tests: 2 (4 devices)
Total yield: 44.3 kilotons
The Details:
1965 - ‘Tern’ detonated in a vertical shaft 691 feet (210m) beneath Yucca Flat area U3 at 18:22 GMT with a yield of 0.5 kilotons from the LANL weapons development device, causing a 3.6 magnitude ground shock and vented 170 curies of Xenon from surface ground zero beginning 6 hours after detonation and lasting 4.6 days. 398th U.S. test. Coordinates: 37.04497, -116.01396.
1970 - ‘342’, ‘343’, and‘344’ detonated simultaneously in the same tunnel within Degelen Mountain, Semipalatinsk at 07:03 GMT with a combined yield of 42 kilotons from the 3 devices as part of a weapons effects test, causing a 5.6 magnitude ground shock. 316th Russian test. Coordinates: 49.7956, 78.1239.
1971 - ‘363’ detonated in a tunnel within Degelen Mountain, Semipalatinsk at 05:03 GMT with a yield of 1.8 kilotons as part of a weapons effects test, causing a 4.47 magnitude ground shock. 332nd Russian test. Coordinates: 49.80334, 78.16045.

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JANUARY 30TH

U.S. tests: 5
Russian tests: 2 (5 devices)
Total yield: 86.6 kilotons.
The Details:
1962 - ‘Dormouse’detonated  in a vertical shaft 1,191 feet (363m) beneath Yucca Flat area U3 at 18:00 GMT with a yield of 10 kilotons from the LANL weapons development device during Operation Nougat, creating a 547 foot (167m) diameter subsidence crater and venting unknown gaseous radiation during drill-back operations. 207th U.S. test. Coordinates: 37.04679, -116.04034.
1964 - ‘Club’detonated in a vertical shaft 592 feet (180m) beneath Yucca Flat area U2 at 16:00 GMT with a yield of 2 kilotonsfrom the LLNL weapons development device during Operation Niblick, causing a 4.1 magnitude ground shock, creating 98 foot (30m) diameter subsidence crater and venting 590 curies of Xenon from surface ground zero cables for 2 hours after detonation and for 10 hours during drill-back operations. 352nd U.S. test. Coordinates: 37.13616, -116.07153.
1967 - ‘272’and ‘273’detonated simultaneously in the same tunnel within Degelen Mountain, Semipalatinsk at 04:02 GMT with a combined yield of 4.6 kilotons from the two weapons development devices, causing a 4.8 magnitude ground shock. 263rd Russian test. Coordinates: 49.7674, 77.9914.
1969 - ‘Vise’detonated in a vertical shaft 1,489 feet (454m) beneath Yucca Flat area U3 at 15:00 GMT with a yield of 20 kilotonsfrom the LANL weapons development device during  Operation Bowline, causing a 4.9 magnitude ground shock and creating a 879 foot (268m) diameter subsidence crater. 585th U.S. test. Coordinates: 37.0533, -116.02998.
1969 - ‘Biggin’ detonated in a vertical shaft 795 feet (242m) beneath Yucca Flat area U9 at 15:17 GMT with a yield of <20 kilotons from the LLNL weapons development device. 586thU.S. test. Coordinates: 37.13326, -116.04113.
1970 - ‘Ajo’detonated in a vertical shaft 997 feet (304m) beneath Yucca Flat area U3 at 17:00 GMT with a yield of 20 kilotonsfrom the LANL weapons development device during Operation Mandrel, causing a 4.6 magnitude ground shock and creating a 574 foot (175m) subsidence crater. 629th U.S. test. Coordinates: 37.03079, -116.03562.
1974 – ‘445’, ‘446’, and ‘447’detonated simultaneously in the same tunnel within Degelen Mountain, Semipalatinsk at 04:57 GMT with a combined yield of 30 kilotons, causing a 5.4 magnitude ground shock. 396th Russian test. Coordinates: 49.8158, 78.0401.

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JANUARY 31ST

U.S. tests: 2
Total yield: 24 kilotons
The Details:
1968 - ‘Mallet’ detonated in a vertical shaft 789 feet (240m) beneath Yucca Flat area U3 at 15:30 GMT with a yield of 4 kilotons from the LANL weapons development device during Operation Crosstie, creating a 361 foot (110m) diameter subsidence crater. 531st U.S. test. Coordinates: 37.00098, -116.01002.
1984 - ‘Gorbea’ detonated in a vertical shaft 1,273 feet (388m) beneath Yucca Flat area U2 at 15:30 GMT with a yield of 20 kilotons from the LLNL weapons development device during Operation Fusileer, causing a 4.1 magnitude ground shock and venting 12 curies of Xenon during drill-back operations. 937th U.S. test. Co-ordinates: 37.11334, -116.12229.

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