Operation Cresset was a group of 22 nuclear tests conducted by the United States in 1977 and 1978. 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 Fulcrum series and preceded the Operation Quicksilver series.

+ US Cresset 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 Bobstay 14:15:00.08 PST (–8 hrs) NTS Area U3jb – underground shaft,weapons development

I-131 venting detected,

Hybla Gold 18:06:00.07 PST (–8 hrs) NTS Area U12e.20 – tunnel,weapon effect

I-131 venting detected, 0

Shot to test the MX missile shallow buried trench basing concept to see if a nearby nuclear fireball would cause the trench to act as a shock tube. Sandreef 22:00:00.075 PST (–8 hrs) NTS Area U7aq – underground shaft,weapons development

Seamount 19:30:00.077 PST (–8 hrs) NTS Area U3kp

underground shaft,weapons development

Rib 15:00:00.17 PST (–8 hrs) NTS Area U3jv – underground shaft,weapons development

Farallones 15:30:00.07 PST (–8 hrs) NTS Area U3fa – underground shaft,weapons development

Venting detected,

Campos 21:53:00.162 PST (–8 hrs) NTS Area U9cp – underground shaft,weapons development

Venting detected,

Reblochon 17:00:00.164 PST (–8 hrs) NTS Area U2en – underground shaft,weapons development

Venting detected,

Karab 15:00:00.07 PST (–8 hrs) NTS Area U4ah – underground shaft,weapons development

Venting detected

Iceberg 16:30:00.2 PST (–8 hrs) NTS Area U4g – underground shaft,weapons development

Topmast 16:30:00.114 PST (–8 hrs) NTS Area U7ay – underground shaft,weapons development

Backbeach 17:45:00.073 PST (–8 hrs) NTS Area U19x – underground shaft,weapons development

Asco 14:35:00.162 PST (–8 hrs) NTS Area U10bc – underground shaft,safety experiment

Transom 15:00:00.07 PST (–8 hrs) NTS Area U4f – underground shaft,weapons development

Fizzle? Device destroyed by Quicksilver/Hearts detonation on 1979. Jackpots 17:00:00.075 PST (–8 hrs) NTS Area U3kj – underground shaft,weapons development

Satz 14:00:00.167 PST (–8 hrs) NTS Area U2dq – underground shaft,weapons development

Venting detected

Lowball 17:00:00.08 PST (–8 hrs) NTS Area U7av – underground shaft,weapons development

Panir 14:00:00.164 PST (–8 hrs) NTS Area U19ys – underground shaft,weapons development

Diablo Hawk 15:15:00.16 PST (–8 hrs) NTS Area U12n.10a – tunnel,weapon effect Weapon effect on W87 warhead

Cremino - 1 16:30:00.165 PST (–8 hrs) NTS Area U8e – underground shaft,weapons development

Simultaneous, same hole. Cremino-Caerphilly - 2 16:30:00.17 PST (–8 hrs) NTS Area U8e + underground shaft,weapons development

Simultaneous, same hole. Draughts 17:00:00.071 PST (–8 hrs) NTS Area U7al – underground shaft,weapons development

Rummy 17:20:00.076 PST (–8 hrs) NTS Area U7au – underground shaft,weapons development

References