The reason for a possible “Earthquake” was felt on the border with East Yorkshire on Wednesday has been revealed.
Residents i North Yorkshire described their home, shaking next to rumbling noises for fear the area had been hit by some sort of seismic shake.
At the time, the site Volcana Discovery reported one “unconfirmed” earthquake or “seismic-like event” in North Yorkshire, 32 km northeast of York.
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It said: “We are receiving unconfirmed early reports of earthquakes possibly caused by seismic activity in or near York (England), England, UK on November 17, 2021 (GMT) at approximately 15.48.”
“There are no details yet on the magnitude or depth of this possible earthquake. If confirmed, we can expect more accurate data to emerge within the next few minutes.”
Meanwhile, a woman wrote on Twitter just after 4.30pm on Wednesday to say she felt her whole house was “shaking”.
“I felt the whole house shake and rumble half an hour ago!” she said. “Apparently it was a small earthquake in York an hour away!”
While a man tweeted: “Just had an earthquake near York!”
BGSseismology, which provides “news from the British Geological Survey’s Seismology team”, said it thought the event was more likely to be a sonic boom rather than an earthquake.
It read: “We got quite a few felt reports from North Yorkshire and you can see something at our stations in the area. We think this is a sonic boom from a plane rather than an earthquake.”
The British Geological Survey supported the theory.
It tweeted: “Data from BGS seismic networks in the region were examined and signals according to a possible sonic origin were recorded between 15.47.42s and 15.49.23s UTC at several stations, on BGS seismic networks, in North Yorkshire.
The reports included: ‘the house shook and the conservatory creaked’, ‘a low rumble that ends with a down’, ‘the windows rattled’ and ‘felt the ground tremble’.
“The reports received are also consistent with historical observations received for past events of sonic origin.”
Now The Independent has reported this the cause has been confirmed as a sonic boom from a Swiss fighter jet.
The Swiss Air Force confirmed that one of their F-18 Hornet aircraft was behind the shock wave over a wide area at 1 p.m. 15.50 Wednesday.
Officials said the plane had attended “routine operational training” and apologized for the inconvenience.
A Swiss Air Force division is currently conducting training missions at RAF Leeming in North Yorkshire.
The flight took place across the North Sea and the sound was heard in parts of North Yorkshire and East Cleveland. There were reports from Redcar, Malton and Whitby.
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A spokeswoman told the Independent that sound bombs from planes out at sea are typically not heard on land, but “climatic and wind conditions” may have been behind the sound’s unusual range.
Sonic boom is the result of shock waves from objects traveling through the air faster than the speed of sound.
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