Military jets likely to blame for Charleston's big 'boom' heard Monday

Social media reaction to a mystery "boom" this morning. (WCIV)

The mysterious sound was loud enough to grab attention.

Comments flooded in on a West Ashley neighborhood page and other social media within a half hour. Some said they thought the boom was thunder or a car crash.

Others said it felt like an earthquake because it shook their house and scared pets.

READ MORE | Mystery "boom" shakes the Charleston area Monday

Jerry Sanders lives in Carolina Bay and said the noise was startling.

"The windows shook and in our house and I was just surprised because I really haven't heard anything like that before around this area," said Sanders.

The Charleston-native said she thought it was construction because there's so much growth and development in West Ashley.

"I heard a huge 'boom,' the windows rattled a little bit and I thought maybe that (they were) doing some building. I thought maybe they were doing some small explosions," Sanders said. "That's what I thought because a lot of building is still going on in this neighborhood so I just assume probably that's what it was."

The boom could be heard from Mount Pleasant to Downtown to West Ashley and Folly Beach.

Julie Scuillo lives in Washington D.C. but was out on Folly Beach with her family. Her first impression was a little different.

"Is it a bomb? I mean, really," Scuillo said. "I have a young son and he asked and I was like, 'oh, it's a firework.' It almost sounded like the same noise, a loud firework."

She said the boom lasted about five seconds then went away. She said everything was back to normal on the beach within a couple minutes.

"Everyone just kind of popped up and was looking around in confusion," she said.

According to ABC News 4's meteorologists, the boom was not an earthquake, there was no seismic activity detected at all. They said it was likely a sonic boom out over the Atlantic Ocean.

There's often military training off the coast.

Fighter jets are one of the few aircrafts capable of breaking the sound barrier—741 miles-per-hour—to cause a sonic boom.

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