Ocean City Shake Not A Quake, But A Sonic Boom - 47 ABC - Delmarva's Choice

Ocean City Shake Not A Quake, But A Sonic Boom

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OCEAN CITY, Md. - From Worcester County to Southern Delaware, social media exploded Thursday with reports of what many initially thought was an earthquake.

"You're sitting there and all of a sudden you felt a rumble go through," said Jeff Mushrush of Ocean City.

A seismograph from the Maryland Geological Survey showed a blip of unusual activity just before noon, but state officials confirmed that shake felt by many, was no quake.

"You could tell it was not an earthquake signal.  Usually, if it was an earthquake, you would see a very sharp peak, and then what happens is the tail of the event, also called the coda, tails off almost like in the shape of a cigar," says Stefanie Baxter with the Delaware Geological Survey.

To confirm their suspicions, local scientists turned to a geological center in New York, which has access to ten seismometers up and down the East Coast, like those in Georgetown, Delaware.  None of which showed any activity.

Baxter say that blip of could've been almost anything "sometimes it could be a piece of heavy construction equipment going right by a seismometer."

In this case, the Maryland Emergency Management Agency confirmed on Twitter, it was a sonic boom produced by two supersonic flights operating from the Patuxent Naval Air Station.

According to the Maryland Geological survey, the only earthquake on record in Ocean City happened back in October of 1928.

The 5.8 magnitude earthquake felt on Delmarva in August of 2011 was actually centered in Virginia.

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