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Project Cannikin (1971)
エネルギー省による、この実験の記録動画「Largest Underground Nuclear Test: Spartan ABM Warhead (Operation Grommet-Cannikin) 1971 US DOE」が公開されている。ただし、機密解除時に、ナレーションがカットされたと思われる部分が幾つかある。
この動画には「津波は起きなかった」というナレーションがある。これは1964年3月27日のマグニチュード9,2のアラスカ地震で、津波が起きて124名が死亡したことがあり、地下核実験で津波が起きることが危惧されていたことに対応したもの。同じく、アムチトカ島で1969年10月2日に行われた核実験Milrowに対しては、アラスカで抗議活動が行われており、1971年7月には反核団体Committee for Nuclear Responsibilityが原子力委員会の実験の差し止めを求める訴訟が行われていて（最高裁で却下）、津波が起きなかったことに言及する必要があったようである。
Transcript
0:19 In the late summer of 1971, final preparations were being made on Amchitka island in the remote Aleutian island chain of Alaska for project Cannikin.
0:30 Cannikin was the United States Atomic Energy Commission underground nuclear detonation to proof test a warhead for the Spartan missile of the safeguard ballistic missile defense program.
0:49 The nuclear device and instrumentation canisters were lowered in a hole line with 54 inch diameter steel casing into a mined cavity 5875 feet beneath the surface of the island.
1:03 The hole then was completely stemmed or backfilled with material designed to assure that the radioactivity produced by the detonation, would be completely contained underground.
1:16 Cannikin device was predicted to have a yield of less than five megatons
1:24 Prior to the test everyone left the island except for 242 persons who are at the control point at the northwest tip of Amchitka about 23 miles from Ground Zero
1:37 The closest places where people live are military bases at Adak and Shemya about 200 miles away.
1:44 Following the day of a violent storm with winds exceeding 100 miles an hour the Cannikin experiment was conducted on Saturday< November 6, 1971 at 11am Bering standard time,
1:59 While water turbulence was created in the immediate vicinity of Amchitka, no tsunami or large ocean wave was observed or recorded.
2:49 Ground shock resulting directly from the destination was felt as a rocking motion at the control point 23 miles away and was faintly perceptible at military bases on Adak ans Shemya.
3:03 There is no record of ground motion being felt at more distant locations.
3:08 Seismic recordings of the tests showed a body wave magnitude of 6.8 and the surface wave magnitude of 5.7 as a direct result of the destination.
3:38 A high-speed camera aimed at the cableway extending between ground zero and the recording trailer park.
3:45 The energy produced by the destination cause the surface of the island directly above the device to be raised momentarily approximately 25 feet.
3:57 The dark material seen rising from the ground was loose dirt from roads and construction areas.
4:03 The lighter material was water from some of the many small lakes on the island and surface water from rain
4:10 As was predicted, all of the radioactive material from the test was contained underground.
4:18 No radioactivity resulting from the test has been detected or is expected at the surface or in the sea.
4:25 Surveillance will continue for a number of years.
5:06 Specially designed shock mitigation mounts were installed on trailers containing data recording instruments
5:16 The slow-motion camera at the recording trailer park, recorded the reaction of the instrument trailers to the two pulses of ground acceleration caused by the destination.
8:06 Some rocks and sea stacks along the coast were damaged by ground motion.
8:13 Preliminary indications were that the beach and ocean floor in the near vicinity of the Cannikin site were raised four to six feet permanently.
8:25 As predicted some bio environmental effects of Cannikin were noticeable, but no permanent harm to Amchtka wildlife populations or plant life is expected.
9:01 As ground motion from the explosion, move through water in lakes near the test.
9:08 It created a momentary sharp rise in pressure and water was thrown into the air.
9:15 This photo sequence was cut short because of the effect of strong ground motion on the photo station.
9:37 This view after Cannikin, shows that the Tundra surface in the ground zero area was considerably cracked and otherwise disturbed, as had been expected.
9:49 Temporary buildings in this area were badly damaged, but the metal building containing instrumentation cable reels had only minor damage, even though it was located within 250 feet of ground zero.
10:28 The shock mitigation system in the recording trailer park was satisfactory.
10:32 All classified experiments designed to measure the device performance recorded data.
10:39 And preliminary examination indicated that the desired information was obtained.
11:00 Along the Bering sea coastline, cliff and bluff falls were greater than had been predicted for a two-mile stretch near ground zero.
12:24 Approximately 38 hours after the test, subsidence in the ground zero area was formed, when rock above the cavity created by the detonation collapsed all the way to the surface.
12:37 when the final collapse occurred seismic instruments indicated the resulting earth disturbance had a body wave magnitude of 4.9.
12:47 A survey indicated an irregular surface subsidence about a mile-and-a-half across with a maximum depth of about 55 feet.
Project Cannikin (1971) 
1971年11月6日 Cannikin実験
Cannikinはローレンスリバモア国立研究所の数百名が参加し、5年近くの歳月をかけた大きな仕事だった。2年間の掘削で、これまでにない直径27メートル深さ1845メートルの穴と、それに至る16メートル幅の通路を作った。合計で400トンのケーブルや装置が運び込まれた。グラウンドゼロから600メートルに位置する記録トレーラーには250のオシロスコープが搭載され、爆発時に4.5メートルの垂直動に耐える耐衝撃取り付けがなされた。
Cannikinは最も求められていた課題である「スパルタン弾道弾迎撃ミサイルのための強化X線弾頭」について、研究所の成功を確認した。実験は、アラスカの不毛のアムチトカ島で1971年に行われた。ほぼ5メガトンの爆発で、リヒタースケールマグニチュード7.0の地震が起きたが、実験データは成功裏に収集された。
"The 1970s" on LLNL
エネルギー省による、この実験の記録動画「Largest Underground Nuclear Test: Spartan ABM Warhead (Operation Grommet-Cannikin) 1971 US DOE」が公開されている。ただし、機密解除時に、ナレーションがカットされたと思われる部分が幾つかある。
この動画には「津波は起きなかった」というナレーションがある。これは1964年3月27日のマグニチュード9,2のアラスカ地震で、津波が起きて124名が死亡したことがあり、地下核実験で津波が起きることが危惧されていたことに対応したもの。同じく、アムチトカ島で1969年10月2日に行われた核実験Milrowに対しては、アラスカで抗議活動が行われており、1971年7月には反核団体Committee for Nuclear Responsibilityが原子力委員会の実験の差し止めを求める訴訟が行われていて（最高裁で却下）、津波が起きなかったことに言及する必要があったようである。
Transcript
0:19 In the late summer of 1971, final preparations were being made on Amchitka island in the remote Aleutian island chain of Alaska for project Cannikin.
0:30 Cannikin was the United States Atomic Energy Commission underground nuclear detonation to proof test a warhead for the Spartan missile of the safeguard ballistic missile defense program.
0:49 The nuclear device and instrumentation canisters were lowered in a hole line with 54 inch diameter steel casing into a mined cavity 5875 feet beneath the surface of the island.
1:03 The hole then was completely stemmed or backfilled with material designed to assure that the radioactivity produced by the detonation, would be completely contained underground.
1:16 Cannikin device was predicted to have a yield of less than five megatons
1:24 Prior to the test everyone left the island except for 242 persons who are at the control point at the northwest tip of Amchitka about 23 miles from Ground Zero
1:37 The closest places where people live are military bases at Adak and Shemya about 200 miles away.
1:44 Following the day of a violent storm with winds exceeding 100 miles an hour the Cannikin experiment was conducted on Saturday< November 6, 1971 at 11am Bering standard time,
1:59 While water turbulence was created in the immediate vicinity of Amchitka, no tsunami or large ocean wave was observed or recorded.
2:49 Ground shock resulting directly from the destination was felt as a rocking motion at the control point 23 miles away and was faintly perceptible at military bases on Adak ans Shemya.
3:03 There is no record of ground motion being felt at more distant locations.
3:08 Seismic recordings of the tests showed a body wave magnitude of 6.8 and the surface wave magnitude of 5.7 as a direct result of the destination.
3:38 A high-speed camera aimed at the cableway extending between ground zero and the recording trailer park.
3:45 The energy produced by the destination cause the surface of the island directly above the device to be raised momentarily approximately 25 feet.
3:57 The dark material seen rising from the ground was loose dirt from roads and construction areas.
4:03 The lighter material was water from some of the many small lakes on the island and surface water from rain
4:10 As was predicted, all of the radioactive material from the test was contained underground.
4:18 No radioactivity resulting from the test has been detected or is expected at the surface or in the sea.
4:25 Surveillance will continue for a number of years.
5:06 Specially designed shock mitigation mounts were installed on trailers containing data recording instruments
5:16 The slow-motion camera at the recording trailer park, recorded the reaction of the instrument trailers to the two pulses of ground acceleration caused by the destination.
8:06 Some rocks and sea stacks along the coast were damaged by ground motion.
8:13 Preliminary indications were that the beach and ocean floor in the near vicinity of the Cannikin site were raised four to six feet permanently.
8:25 As predicted some bio environmental effects of Cannikin were noticeable, but no permanent harm to Amchtka wildlife populations or plant life is expected.
9:01 As ground motion from the explosion, move through water in lakes near the test.
9:08 It created a momentary sharp rise in pressure and water was thrown into the air.
9:15 This photo sequence was cut short because of the effect of strong ground motion on the photo station.
9:37 This view after Cannikin, shows that the Tundra surface in the ground zero area was considerably cracked and otherwise disturbed, as had been expected.
9:49 Temporary buildings in this area were badly damaged, but the metal building containing instrumentation cable reels had only minor damage, even though it was located within 250 feet of ground zero.
10:28 The shock mitigation system in the recording trailer park was satisfactory.
10:32 All classified experiments designed to measure the device performance recorded data.
10:39 And preliminary examination indicated that the desired information was obtained.
11:00 Along the Bering sea coastline, cliff and bluff falls were greater than had been predicted for a two-mile stretch near ground zero.
12:24 Approximately 38 hours after the test, subsidence in the ground zero area was formed, when rock above the cavity created by the detonation collapsed all the way to the surface.
12:37 when the final collapse occurred seismic instruments indicated the resulting earth disturbance had a body wave magnitude of 4.9.
12:47 A survey indicated an irregular surface subsidence about a mile-and-a-half across with a maximum depth of about 55 feet.
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