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Mysterious explosions. Unexplained shaking
reply to post by Human_AlienThe Florida link you inserted above (I believe) was the day before the Japan earthquake if I remember correctly.
As used in military applications, the wavelength is ~299,792 km (~186,282 mi) per second divided by 50–85 Hz, which equals around 3,527 to 5,996 km (2,192 to 3,726 mi) long; by comparison, Earth's diameter is around 12,742 km (7,918 mi). Because of this huge size requirement and, to transmit internationally using ELF frequencies, the earth itself must be used as an antenna, with extremely long leads going into the ground. Various other means are taken to construct radio stations with substantially smaller sizes, such as electrical lengthening.
The US maintained two sites, in the Chequamegon-Nicolet National Forest, Wisconsin and the Escanaba River State Forest, Michigan (originally named Project Sanguine, then downsized and rechristened Project ELF prior to construction), until they were dismantled, beginning in late September 2004.
The city has so far managed to rule out problems with the water and sewer system, elevated gas levels, area blasting or mining, industrial businesses, and even military operations, WBAY reported.
"I think that right now the greatest possibility is that it is some sort of natural phenomenon. I think that it's a possibility that there is some earth shifting going on underneath the ground that creates those popping sort of exploding popping or vibrating noises that people feel," City Administrator Lisa Kuss said.
The booms and shakes have gotten so bad that they have begun to drive residents from the town. "Our dog is scared, our neighbors are leaving and stuff, so we decided we are going somewhere else for a while," Dennis Padia said. "It's that loud, and it bothers you. You can't go to sleep."
The booms and shakes have gotten so bad that they have begun to drive residents from the town.