Announced United States Nuclear Tests -- By Event Event Name. Date (GCT) Location Type. Purpose | Yield Range - Little Fefler Il Slightly above ground DoD Event--Operation Sunbeam Radioactivity not detected off site 07/07/62 NTS Surface WeaponsEffects Low Lockney 09/24/87 NTS Shaft WeaponsRelated 20 to 150 kt Logan No radioactive release detected 10/16/58 NTS Tunnel Weapons Related 5 kt Long Shot DoD Event Nuclear test detection experiment 10/29/65 Amchitka Shaft Vela Uniform About 80 kt Longchamps 04/19/72 NTS Shaft WeaponsRelated Less than 20 kt Lovage 12/17/69 NTS Shaft WeaponsRelated Less than 20 kt Lowball 07/12/78 NTS Shaft WeaponsRelated 20 to 150 kt Lubbock 10/18/91 NTS Shaft WeaponsRelated 20 to 150 kt Luna Unstemmed hole Radioactivity not detected off site 09/21/58 NTS Shaft Safety Experiment 1.5 tons Mad Accidental release of radioactivity detected on site only 12/13/61 NTS Shaft WeaponsRelated 0.50 kt Madison 12/12/62 NTS Tunnel WeaponsRelated Low Magnolia 05/26/58 Enewetak Barge WeaponsRelated Manatee 12/14/62 NTS Shaft WeaponsRelated Low Manteca 12/10/82 NTS Shaft WeaponsRelated 20 to 150 kt Manzanas Accidental release of radioactivity detected on site only 05/21/70 NTS Shaft WeaponsRelated Less than 20 kt Maple 06/10/58 Bikini Barge WeaponsRelated Maribo 06/26/85 NTS Shaft WeaponsRelated -82- Less than 20 kt