The United States's Fulcrum nuclear test series was a group of 21 nuclear tests conducted in 1976–1977. These testsA bomb test may be a salvo test, defined as two or more explosions "where a period of time between successive individual explosions does not exceed 5 seconds and where the burial points of all explosive devices can be connected by segments of straight lines, each of them connecting two burial points and does not exceed 40 kilometers in length". followed the Operation Anvil (nuclear test) series and preceded the Operation Cresset series.

+ United States' Fulcrum 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 Gouda 14:30:00.164 PST (–8 hrs) NTS Area U2ef – underground shaft,weapons development

Sprit 14:58:00.077 PST (–8 hrs) NTS Area U3hc – underground shaft,weapons development

Chevre 15:15:00.163 PST (–8 hrs) NTS Area U10ay – underground shaft,weapons development

Redmud 14:49:30.083 PST (–8 hrs) NTS Area U7ab – underground shaft,weapons development

Asiago 15:09:00.166 PST (–8 hrs) NTS Area U2ar – underground shaft,weapons development

Sutter 15:58:00.162 PST (–8 hrs) NTS Area U2bw – underground shaft,weapons development

Rudder 18:00:00.076 PST (–8 hrs) NTS Area U7aj(s) – underground shaft,weapons development

Cove - 1 (with Oarlock) 17:53:00.16 PST (–8 hrs) NTS Area U3ki + underground shaft,weapons development

Simultaneous, separate holes. Oarlock - 2 (with Cove) 17:53:00.073 PST (–8 hrs) NTS Area U3km – underground shaft,weapons development

Simultaneous, separate holes. Dofino - 1 14:24:00.164 PST (–8 hrs) NTS Area U10ba – underground shaft,weapons development

Venting detected,

Simultaneous, same hole. Dofino-Lawton - 2 14:24:00.16 PST (–8 hrs) NTS Area U10ba – underground shaft,weapons development

Venting detected

Simultaneous, same hole. Marsilly 15:00:00.167 PST (–8 hrs) NTS Area U2ei – underground shaft,weapons development

Venting detected,

Bulkhead 15:00:00.084 PST (–8 hrs) NTS Area U7am – underground shaft,weapons development

Crewline 17:00:00.076 PST (–8 hrs) NTS Area U7ap – underground shaft,weapons development

Forefoot 17:15:00.098 PST (–8 hrs) NTS Area U3kF – underground shaft,weapons development

Carnelian 14:07:00.162 PST (–8 hrs) NTS Area U4af – underground shaft,weapons development

Venting detected,

Strake 16:40:00.074 PST (–8 hrs) NTS Area U7ae – underground shaft,weapons development

Gruyere - 1 14:41:00.165 PST (–8 hrs) NTS Area U9cg – underground shaft,weapons development

Simultaneous, same hole. Gruyere-Gradino - 2 14:41:00.16 PST (–8 hrs) NTS Area U9cg – underground shaft,weapons development

Venting detected,

Simultaneous, same hole. Flotost 15:49:00.168 PST (–8 hrs) NTS Area U2ao – underground shaft,weapons development

Venting detected,

Scupper 17:32:00.098 PST (–8 hrs) NTS Area U3hj – underground shaft,weapons development

Scantling 17:55:00.1 PST (–8 hrs) NTS Area U4h – underground shaft,weapons development

Ebbtide 14:36:30.077 PST (–8 hrs) NTS Area U3kt – underground shaft,weapons development

Coulommiers 14:00:00.161 PST (–8 hrs) NTS Area U2ei – underground shaft,weapons development

Venting detected,

References