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Originally posted by muzzleflash
An ATS poster just created this thread
Here is what he posted :
"Strange sounds heard after earthquakes in West texas"
After reading about the recent earthquakes in west texas, I found an article from a city in that area and the residents reported a strange sound after the earthquakes that resembled a "sonic boom". Now please forgive me, as I am not an expert or authority on earthquakes, but is this common? I would suppose as the earth is moving and shifting underneath, there would be a rumbling sound as the tectonic plates rub against each other and such. But the way this is described is that it came from the sky. I thought I would post this to see what others thought, and if there have been other cases like this. Thank you, and have a great day! www.kwes.com...
"I felt the house shake," area resident Bill Nance said.
He was working on his Sunday morning crossword puzzle when he noticed doors trembling. He wasn't sure if it was an earthquake or an explosion or even a sonic boom because of the three-second duration.
"It was very short," Nance said. "I've been in many, many earthquakes."
He said he had been on the West Coast and in Japan where earthquakes came almost daily.
Earthquake "booms" have been reported for a long time, and they tend to occur more in the Northeastern US and along the East Coast. Of course, most "booms" that people hear or experience are actually some type of cultural noise, such as some type of explosion, a large vehicle going by, or sometimes a sonic boom, but there have been many reports of "booms" that cannot be explained by man-made sources. No one knows for sure, but scientists speculate that these "booms" are probably small shallow earthquakes that are too small to be recorded, but large enough to be felt by people nearby.
As it turns out....there are many factors that contribute to the "sound' that an earthquake makes. To begin to understand these factors we have to understand the different types of waves, the speed they travel through the earth, and the speed that sound travels through the air.
Perhaps the best way to understand earthquake sounds are from an actual experiment that took place back in the 80's in California by David Hill. Dr. Hill's team recorded sounds that came out of the earth (from nearby small earthquakes between magnitude 2.0 and 3.0) and simultaneously measured the arrival of the P wave on a seismograph. Researchers also reported hearing a sound before the S waves were recorded; this turned out to be the arrival of the P wave.