Residents in North Yorkshire have reported homes shaking, windows rattling and feeling the ground tremble, following what has been described by experts as a "sonic event".
Initially, people reported a suspected earthquake in the area at around 3.50pm, according to the British Geological Survey (BGS).
Some social media users said they felt a quake in the town of Malton.
However, following analysis, seismologists have established it was the result of a sound as opposed to movements in the ground.
One resident, Dr Amy-Jane Beer, tweeted: "Felt in the air and all through our bodies near Castle Howard.
"Kids froze, dog ran for her life. Former now thrilled, latter hiding under my bed."
Whitby councillor, Phillip Trumper, said he could "see the windows vibrating".
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"The house shook, I could see the windows vibrating… It sounded like something really heavy falling over in the house next door," he said.
"I suppose it (could) have been a sonic boom," the 48-year-old added.
A sonic boom is a thunder-like noise a person on the ground hears when an aircraft or other type of aerospace vehicle flies overhead faster than the speed of sound, or "supersonic," according to NASA.
On Twitter, the BGS said: "Reports described 'house shook and conservatory creaked', 'a low rumble ending in a thud', 'windows rattled' and 'felt the ground tremble'."
It added that data was examined and "signals consistent with a possible sonic origin" were recorded in the region between 3:47pm and 3:49pm.
"The reports received are also consistent with historical observations received for previous events with a sonic origin," it added.
The origin of the phenomenon is currently unknown and the BGS said it was unable to comment on sonic events.