A set of mysterious sonic booms have scientists wondering what was behind the vibrations that shook northern Utah overnight.
    
A University of Utah seismologist says the walls of her house were shaking in the Sugar House neighborhood of Salt Lake City late Tuesday.
    
Catherine Whidden says the university's instruments recorded back-to-back sonic booms around 9 p.m. Tuesday. She believes the low-frequency rumble originated in the atmosphere. Whidden says Utah had no earthquakes overnight.
    
The U.S. Air Force and rocket maker ATK say they weren't responsible for breaking the sound barrier.
    
Science buffs call the vibrations "earthquake booms" originating deep inside the Earth. Whidden says mainstream science doesn't recognize any such phenomena.
    
Meteorologists felt the walls of their office shake at the National Weather Service office in Salt Lake City.