# 1987 Soviet nuclear tests

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The Soviet Union's 1987 nuclear test series was a group of 24 nuclear tests conducted in 1987. These tests followed the 1985 Soviet nuclear tests series and preceded the 1988 Soviet nuclear tests series.
Soviet Union's 1987 series tests and detonations :
| Name | Date time (UT) | Local time zone | Location | Elevation + height | Delivery, Purpose | Yield | Fallout | Notes |
| 669 | 26 February 1987 04:58:24.3 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 130 49°49′48″N 78°05′01″E﻿ / ﻿49.8299°N 78.0835°E﻿ / 49.8299; 78.0835﻿ (669) | 635 m (2,083 ft) + | tunnel, fundamental science | 24 kt | | |
| 670 - 1 | 12 March 1987 01:57:19.63 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1315 49°56′11″N 78°49′36″E﻿ / ﻿49.93633°N 78.82663°E﻿ / 49.93633; 78.82663﻿ (670 - 1) | 330 m (1,080 ft) + | underground shaft, weapons development | 11 kt | | |
| 670 - 2 | 12 March 1987 01:57:19.6 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1315 49°56′11″N 78°49′36″E﻿ / ﻿49.93633°N 78.82663°E﻿ / 49.93633; 78.82663﻿ (670 - 2) | 330 m (1,080 ft) + | underground shaft, weapons development | unknown yield | | |
| 671 | 3 April 1987 01:17:10.36 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1318 49°55′09″N 78°46′47″E﻿ / ﻿49.91914°N 78.77961°E﻿ / 49.91914; 78.77961﻿ (671) | 330 m (1,080 ft) + | underground shaft, weapons development | 140 kt | | |
| 672 - 1 | 3 April 1987 01:17:12.32 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 208 49°44′48″N 78°06′58″E﻿ / ﻿49.7467°N 78.1162°E﻿ / 49.7467; 78.1162﻿ (672 - 1) | 597 m (1,959 ft) + | tunnel, weapons development | 1 kt | | |
| 672 - 2 | 3 April 1987 01:17:12.3 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 208 49°44′48″N 78°06′58″E﻿ / ﻿49.7467°N 78.1162°E﻿ / 49.7467; 78.1162﻿ (672 - 2) | 597 m (1,959 ft) + | tunnel, weapons development | unknown yield | | |
| 672 - 3 | 3 April 1987 01:17:12.3 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 208 49°44′48″N 78°06′58″E﻿ / ﻿49.7467°N 78.1162°E﻿ / 49.7467; 78.1162﻿ (672 - 3) | 597 m (1,959 ft) + | tunnel, weapons development | unknown yield | | |
| unnumbered #11 | 17 April 1987 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 175-3p 49°45′04″N 78°02′56″E﻿ / ﻿49.751°N 78.049°E﻿ / 49.751; 78.049﻿ (unnumbered #11) | + | tunnel, | no yield | | |
| 673 - 1 | 17 April 1987 01:03:07.14 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1384 49°52′36″N 78°40′09″E﻿ / ﻿49.87668°N 78.66917°E﻿ / 49.87668; 78.66917﻿ (673 - 1) | 330 m (1,080 ft) + | underground shaft, weapons development | 86 kt | | |
| 673 - 2 | 17 April 1987 01:03:07.1 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1384 49°52′36″N 78°40′09″E﻿ / ﻿49.87668°N 78.66917°E﻿ / 49.87668; 78.66917﻿ (673 - 2) | 330 m (1,080 ft) + | underground shaft, weapons development | unknown yield | | |
| 673 - 3 | 17 April 1987 01:03:07.1 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1384 49°52′36″N 78°40′09″E﻿ / ﻿49.87668°N 78.66917°E﻿ / 49.87668; 78.66917﻿ (673 - 3) | 330 m (1,080 ft) + | underground shaft, weapons development | unknown yield | | |
| 674 Geliy 3 (Helium) | 19 April 1987 04:00:00.0 | SVET (5 hrs) | Perm, Russia: 404 60°36′N 57°12′E﻿ / ﻿60.6°N 57.2°E﻿ / 60.6; 57.2﻿ (674 Geliy 3 (Helium)) | – 2,015 m (6,611 ft) | underground shaft, oil stimulation | 3.2 kt | | Oil recovery intensification. 170 km NE Bereznyaki. |
| 675 Geliy 3 (Helium) | 19 April 1987 04:05:00.0 | SVET (5 hrs) | Perm, Russia: 405 60°48′N 57°30′E﻿ / ﻿60.8°N 57.5°E﻿ / 60.8; 57.5﻿ (675 Geliy 3 (Helium)) | – 2,055 m (6,742 ft) | underground shaft, oil stimulation | 3.2 kt | | Oil recovery intensification. 170 km NE Bereznyaki. |
| 676 | 6 May 1987 04:02:08.11 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 164 49°46′27″N 77°59′55″E﻿ / ﻿49.7742°N 77.9986°E﻿ / 49.7742; 77.9986﻿ (676) | 772 m (2,533 ft) + | tunnel, fundamental science | 40 kt | | |
| 677 | 6 June 1987 02:37:09.25 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 138 49°49′58″N 78°04′13″E﻿ / ﻿49.8327°N 78.0704°E﻿ / 49.8327; 78.0704﻿ (677) | 604 m (1,982 ft) + | tunnel, fundamental science | 24 kt | | |
| 678 - 1 | 20 June 1987 00:53:07.16 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1326 49°56′16″N 78°44′35″E﻿ / ﻿49.93774°N 78.74298°E﻿ / 49.93774; 78.74298﻿ (678 - 1) | 330 m (1,080 ft) + | underground shaft, weapons development | 107 kt | | |
| 678 - 2 | 20 June 1987 00:53:07.2 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1326 49°56′16″N 78°44′35″E﻿ / ﻿49.93774°N 78.74298°E﻿ / 49.93774; 78.74298﻿ (678 - 2) | 330 m (1,080 ft) + | underground shaft, weapons development | unknown yield | | |
| 679 Neva 2 | 7 July 1987 00:00:00.0 | YAKT (9 hrs) | Sakha, Russia: 68 61°30′N 112°51′E﻿ / ﻿61.5°N 112.85°E﻿ / 61.5; 112.85﻿ (679 Neva 2) | – 1,515 m (4,970 ft) | underground shaft, oil stimulation | 15 kt | | Oil recovery intensification. |
| 680 | 17 July 1987 01:17:09.18 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 168 49°45′59″N 78°01′43″E﻿ / ﻿49.7664°N 78.0287°E﻿ / 49.7664; 78.0287﻿ (680) | 738 m (2,421 ft) – 267 m (876 ft) | tunnel, fundamental science | 78 kt | | |
| 681 Neva 3 | 24 July 1987 02:00:00.0 | YAKT (9 hrs) | Sakha, Russia: 61 61°27′N 112°48′E﻿ / ﻿61.45°N 112.8°E﻿ / 61.45; 112.8﻿ (681 Neva 3) | – 1,520 m (4,990 ft) | underground shaft, oil stimulation | 15 kt | | Oil recovery intensification. |
| 683 - 1 | 2 August 1987 00:58:09.27 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1348 49°52′52″N 78°52′27″E﻿ / ﻿49.88113°N 78.87414°E﻿ / 49.88113; 78.87414﻿ (683 - 1) | 330 m (1,080 ft) + | underground shaft, weapons development | 72 kt | | |
| 683 - 2 | 2 August 1987 00:58:09.3 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1348 49°52′52″N 78°52′27″E﻿ / ﻿49.88113°N 78.87414°E﻿ / 49.88113; 78.87414﻿ (683 - 2) | 330 m (1,080 ft) + | underground shaft, weapons development | unknown yield | | |
| 683 - 3 | 2 August 1987 00:58:09.3 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1348 49°52′52″N 78°52′27″E﻿ / ﻿49.88113°N 78.87414°E﻿ / 49.88113; 78.87414﻿ (683 - 3) | 330 m (1,080 ft) + | underground shaft, weapons development | unknown yield | | |
| 682 - 1 | 2 August 1987 02:00:00.2 | MSK (3 hrs) | NZ Area B, Matochkin Shar, Novaya Zemlya, Russia: A-37A 73°19′34″N 54°36′07″E﻿ / ﻿73.326°N 54.602°E﻿ / 73.326; 54.602﻿ (682 - 1) | 100 m (330 ft) – 390 m (1,280 ft) | tunnel, weapons development | 150 kt | Venting detected off site, 1.5 kCi (56 TBq) | |
| 682 - 2 | 2 August 1987 02:00:00.2 | MSK (3 hrs) | NZ Area B, Matochkin Shar, Novaya Zemlya, Russia: A-37A 73°19′34″N 54°36′07″E﻿ / ﻿73.326°N 54.602°E﻿ / 73.326; 54.602﻿ (682 - 2) | 100 m (330 ft) + | tunnel, weapons development | unknown yield | | |
| 682 - 3 | 2 August 1987 02:00:00.2 | MSK (3 hrs) | NZ Area B, Matochkin Shar, Novaya Zemlya, Russia: A-37A 73°19′34″N 54°36′07″E﻿ / ﻿73.326°N 54.602°E﻿ / 73.326; 54.602﻿ (682 - 3) | 100 m (330 ft) + | tunnel, weapons development | unknown yield | | |
| 682 - 4 | 2 August 1987 02:00:00.2 | MSK (3 hrs) | NZ Area B, Matochkin Shar, Novaya Zemlya, Russia: A-37A 73°19′34″N 54°36′07″E﻿ / ﻿73.326°N 54.602°E﻿ / 73.326; 54.602﻿ (682 - 4) | 100 m (330 ft) + | tunnel, fundamental science | unknown yield | | |
| 682 - 5 | 2 August 1987 02:00:00.2 | MSK (3 hrs) | NZ Area B, Matochkin Shar, Novaya Zemlya, Russia: A-37A 73°19′34″N 54°36′07″E﻿ / ﻿73.326°N 54.602°E﻿ / 73.326; 54.602﻿ (682 - 5) | 100 m (330 ft) + | tunnel, safety experiment | unknown yield | | |
| 684 Neva 4 | 12 August 1987 01:30:00.5 | YAKT (9 hrs) | Sakha, Russia: 101 61°27′N 112°48′E﻿ / ﻿61.45°N 112.8°E﻿ / 61.45; 112.8﻿ (684 Neva 4) | – 834 m (2,736 ft) | underground shaft, oil stimulation | 3.2 kt | | Oil recovery intensification. |
| 685 - 1 | 18 September 1987 02:32:10.01 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 132p 49°48′22″N 78°05′59″E﻿ / ﻿49.806°N 78.0997°E﻿ / 49.806; 78.0997﻿ (685 - 1) | 719 m (2,359 ft) + | tunnel, weapon effect | 1.1 kt | | |
| 685 - 2 | 18 September 1987 02:32:10.0 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 132p 49°48′22″N 78°05′59″E﻿ / ﻿49.806°N 78.0997°E﻿ / 49.806; 78.0997﻿ (685 - 2) | 719 m (2,359 ft) + | tunnel, safety experiment | unknown yield | | |
| 686 Batolit 2 (Batholith) | 3 October 1987 15:15:00.0 | AKTT (6 hrs) | Aktobe, Kazakhstan: BT-2 47°36′N 56°12′E﻿ / ﻿47.6°N 56.2°E﻿ / 47.6; 56.2﻿ (686 Batolit 2 (Batholith)) | – 1,000 m (3,300 ft) | underground shaft, seismic sounding | 8.5 kt | | Seismic probing program. |
| 687 | 16 October 1987 06:06:06.99 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: K-85 49°43′53″N 78°05′26″E﻿ / ﻿49.7313°N 78.0906°E﻿ / 49.7313; 78.0906﻿ (687) | 620 m (2,030 ft) – 82 m (269 ft) | tunnel, weapon effect | 1.1 kt | | |
| 688 - 1 | 15 November 1987 03:31:09.17 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1332 49°53′57″N 78°45′23″E﻿ / ﻿49.89909°N 78.75629°E﻿ / 49.89909; 78.75629﻿ (688 - 1) | 330 m (1,080 ft) + | underground shaft, weapons development | 103 kt | | |
| 688 - 2 | 15 November 1987 03:31:09.2 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1332 49°53′57″N 78°45′23″E﻿ / ﻿49.89909°N 78.75629°E﻿ / 49.89909; 78.75629﻿ (688 - 2) | 330 m (1,080 ft) + | underground shaft, weapons development | unknown yield | | |
| 689 - 1 | 13 December 1987 03:21:07.25 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1355 49°57′43″N 78°47′32″E﻿ / ﻿49.96185°N 78.79222°E﻿ / 49.96185; 78.79222﻿ (689 - 1) | 330 m (1,080 ft) + | underground shaft, weapons development | 137 kt | | |
| 689 - 2 | 13 December 1987 03:21:07.3 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1355 49°57′43″N 78°47′32″E﻿ / ﻿49.96185°N 78.79222°E﻿ / 49.96185; 78.79222﻿ (689 - 2) | 330 m (1,080 ft) + | underground shaft, weapons development | unknown yield | | |
| 690 | 20 December 1987 02:55:09.14 | ALMT (6 hrs) | Degelen, Semipalatinsk, Kazakhstan: 164p 49°46′27″N 77°59′55″E﻿ / ﻿49.7742°N 77.9986°E﻿ / 49.7742; 77.9986﻿ (690) | 772 m (2,533 ft) + | tunnel, fundamental science | 5 kt | | |
| 691 - 1 | 27 December 1987 03:05:07.22 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1388 49°52′47″N 78°43′25″E﻿ / ﻿49.87979°N 78.72368°E﻿ / 49.87979; 78.72368﻿ (691 - 1) | 330 m (1,080 ft) + | underground shaft, weapons development | 117 kt | | |
| 691 - 2 | 27 December 1987 03:05:07.2 | ALMT (6 hrs) | Balapan, Semipalatinsk, Kazakhstan: 1388 49°52′47″N 78°43′25″E﻿ / ﻿49.87979°N 78.72368°E﻿ / 49.87979; 78.72368﻿ (691 - 2) | 330 m (1,080 ft) + | underground shaft, weapons development | unknown yield | | |
* ↑ A 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". Mikhailov, V. N. "Catalog of World Wide Nuclear Testing". Begell-Atom, LLC. Archived from the original on 2014-04-26. Retrieved 2013-12-18.
* ↑ 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.
* ↑ To 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. v
* ↑ Rough 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 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.
* ↑ 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.
* ↑ Include weapons development, weapon effects, safety test, transport safety test, war, science, joint verification and industrial/peaceful, which may be further broken down.
* ↑ Designations 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.
* ↑ Estimated energy yield in tons, kilotons, and megatons. A ton of TNT equivalent is defined as 4.184 gigajoules (1 gigacalorie).
* ↑ Radioactive 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.