The.pdf that anon was too skeered to click (pb):
Noice trips
100 miles off the coast?
The test included the detonation of around 18 tonnes of explosives a few meters near the ship. And, approximately 160 km off the coastal state of Florida, the mega blast triggered an earthquake of 3.9 magnitude at sea.
https://www.msn.com/en-in/news/other/know-more-about-the-fsst-trial-conducted-by-us-navy-in-atlantic-ocean/ar-AALo2Tx