On June 15, 1996 ZetaTalk stated that Booms would become more common and occur even inland as the 12th Planet approached. By March 15, 1999 these mystery booms were being reported, followed by reports from Ohio, Georgia, Atlanta and Alabama.
Mysterious Booms (Dec. 1997 - Jan. 1999)
Paranormal.About.com, March 15, 1999
In January, 1999, a loud boom at 12:15 a.m.disturbed the residents of Colorado Springs and Denver. Some witnesses said the noise was accompanied by a flash of light in the sky. There was no electrical storm. Although it could have been a sonic boom, the military denied any military activity in the area.
On January 10, 1999, dozens of people in Fairfield, Ohio reported a stunning, explosive sound. No cause was ever discovered.
Thousands of homes were rattled by two huge, mysterious booms 30 miles southeast of Los Angeles just before 10 p.m. in May of 1998. Residents described the sounds as explosions, earthquake noises, and thuds. The two booms occurred about five minutes apart.
Two very loud skyquakes startled hundreds of people on the beaches of Ocean City, Md. on July 30, 1998. No planes were in sight, and the sounds seemed to be coming from some miles offshore.
A mysterious boom reverberated through Narragansett Bay, R.I. on August 1, 1998 at 9:30 p.m. Investigating officials could not find the source of the noise.
On Sept. 16, 1997, the campus of the University of North Carolina at Chapel Hill was rocked by a boom that shook the ground and registered 1.1 on the Richter scale. Readings from ground-monitoring equipment showed that the energy did not come from the air, ruling out a sonic boom.
On December 17, 1997, a huge aerial blast rattled windows and blew open storm doors in Rogersville, Mo., a town 13 miles east of Springfield. Again, the Air Force denied the possibility of a sonic boom caused by one of its aircraft.