SOUTHERN UTAH — Following a succession of shakes, rattles and booms reported by residents throughout Washington County, a boom that was heard and felt Thursday evening has been reported as the loudest yet.
The latest boom occurred between 10:30 p.m. and 11 p.m. Thursday, rattling the homes of many residents.
“The waves at that time were traveling at non-seismic speeds,” Hale said.
By definition, seismic waves are energy that travel through the Earth’s layers, which can radiate from earthquakes, blasting or volcanoes. Other waves that are less energetic are referred to as ambient vibrations.
“Sometimes, sonic booms from airplanes hit the ground more violently,” Hale said. “It could be the angle the plane is flying. Too many factors to know. If the inversion is thick in the Salt Lake valley, the sonic booms are felt much stronger.”
Read more about sonic booms here: Southern Utah experiences boom, boom, booms
“It would have sounded like boom, boom, boom, boom, boom for about 10 seconds,” Schwendiman said. “The last time we be blasted was about three or four years ago. We try not to do it every year.”
According to the U of U Seismograph Station’s website:
When an earthquake occurs, the seismogram will show ground motions that typically last from several tens of seconds to many minutes depending on the size of the earthquake and the sensitivity of the seismograph. The height of the recorded waves on the seismogram (wave amplitude) is a greatly magnified representation of the actual ground motion. The magnification is 50,000 times or more depending on the site. A recording of an earthquake has recognizable characteristics. Typically, one can recognize the arrival of different wave types: P (the fastest traveling waves), S (shear waves), and Surface waves.
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