Operation Anvil was a series of 21 nuclear tests conducted by the United States in 1975–1976 at the Nevada Test Site. These tests followed the Operation Bedrock series and preceded the Operation Fulcrum series.

+ United States' Anvil series tests and detonations Name The US, France and Great Britain have code-named their test events, while the USSR and China did not, and therefore have only test numbers (with some exceptions – Soviet peaceful explosions were named). Word translations into English in parentheses unless the name is a proper noun. A dash followed by a number indicates a member of a salvo event. The US also sometimes named the individual explosions in such a salvo test, which results in "name1 – 1(with name2)". If test is canceled or aborted, then the row data like date and location discloses the intended plans, where known. Date time (UT) Local time zoneTo convert the UT time into standard local, add the number of hours in parentheses to the UT time; for local daylight saving time, add one additional hour. If the result is earlier than 00:00, add 24 hours and subtract 1 from the day; if it is 24:00 or later, subtract 24 hours and add 1 to the day. Historical time zone data obtained from the IANA time zone database. LocationRough place name and a latitude/longitude reference; for rocket-carried tests, the launch location is specified before the detonation location, if known. Some locations are extremely accurate; others (like airdrops and space blasts) may be quite inaccurate. "~" indicates a likely pro-forma rough location, shared with other tests in that same area. Elevation + height Elevation is the ground level at the point directly below the explosion relative to sea level; height is the additional distance added or subtracted by tower, balloon, shaft, tunnel, air drop or other contrivance. For rocket bursts the ground level is "N/A". In some cases it is not clear if the height is absolute or relative to ground, for example, Plumbbob/John. No number or units indicates the value is unknown, while "0" means zero. Sorting on this column is by elevation and height added together. Delivery Atmospheric, airdrop, balloon, gun, cruise missile, rocket, surface, tower, and barge are all disallowed by the Partial Nuclear Test Ban Treaty. Sealed shaft and tunnel are underground, and remained useful under the PTBT. Intentional cratering tests are borderline; they occurred under the treaty, were sometimes protested, and generally overlooked if the test was declared to be a peaceful use.Purpose Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down. DeviceDesignations for test items where known, "?" indicates some uncertainty about the preceding value, nicknames for particular devices in quotes. This category of information is often not officially disclosed. YieldEstimated energy yield in tons, kilotons, and megatons. A ton of TNT equivalent is defined as 4.184 gigajoules (1 gigacalorie). FalloutRadioactive emission to the atmosphere aside from prompt neutrons, where known. The measured species is only iodine-131 if mentioned, otherwise it is all species. No entry means unknown, probably none if underground and "all" if not; otherwise notation for whether measured on the site only or off the site, where known, and the measured amount of radioactivity released. References Notes Marsh 17:00:00.113 PST (–8 hrs) NTS Area U3kb – underground shaft,weapons development

Peninsula(aborted)

PST (–8 hrs) NTS Area near U2em + underground shaft,

Became stuck in shaft while being lowered; abandoned, later destroyed by Tinderbox/Azul. Husky Pup 17:11:26.093 PST (–8 hrs) NTS Area U12t.03 – tunnel,weapon effect

Kasseri 14:30:00.16 PST (–8 hrs) NTS Area U20z – underground shaft,weapons development B77 Likely

Venting detected

Likely Full yield test of the B77/B83 Deck 15:30:00.113 PST (–8 hrs) NTS Area U3kd – underground shaft,weapons development

Inlet 15:00:00.093 PST (–8 hrs) NTS Area U19f – underground shaft,weapons development

Leyden 15:30:00.163 PST (–8 hrs) NTS Area U9cm – underground shaft,weapons development

Chiberta 20:00:00.164 PST (–8 hrs) NTS Area U2ek – underground shaft,weapons development B77

Muenster 19:15:00.162 PST (–8 hrs) NTS Area U19e – underground shaft,weapons development

B77/B83 Likely

(reduced yield?)

Likely B77 Components Tested Keelson 14:20:00.112 PST (–8 hrs) NTS Area U7ai – underground shaft,weapons development

Esrom 14:40:00.163 PST (–8 hrs) NTS Area U7ak – underground shaft,weapons development B77

Venting detected,

Fontina 14:45:00.163 PST (–8 hrs) NTS Area U20f – underground shaft,weapons development

Likely B83

Cheshire 11:30:00.162 PST (–8 hrs) NTS Area U20n – underground shaft,weapons development B77

See Whetstone/Cambric. A test of groundwater mobility in moving buried radiaoactives, this time in volcanic rock/soil. Shallows 14:50:00.091 PST (–8 hrs) NTS Area U3jf – underground shaft,weapons development

Venting detected

Estuary 14:00:00.094 PST (–8 hrs) NTS Area U19g – underground shaft,weapons development

Colby 12:30:00.163 PST (–8 hrs) NTS Area U20aa – underground shaft,weapons development B77

Venting detected,

Pool 14:15:00.09 PST (–8 hrs) NTS Area U19p – underground shaft,weapons development

Strait 14:45:00.091 PST (–8 hrs) NTS Area U4a – underground shaft,weapons development

Mighty Epic 19:50:00.17 PST (–8 hrs) NTS Area U12n.10 – tunnel,weapon effect

Rivoli 17:30:00.162 PST (–8 hrs) NTS Area U2eg – underground shaft,weapons development W79

Venting detected

Billet 20:30:00.079 PST (–8 hrs) NTS Area U7an – underground shaft,weapons development B61

I-131 venting detected, 0

References