Loud boom in York County PA
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Was it an earthquake?

York County 911 received several calls late Friday night about a loud boom in the northern end of the county, according to a dispatcher. One of the calls came around 10:50 p.m. from the area of Siddonsburg Road and Glen Arden Drive in Fairview Township.

Emergency responders in both York and Cumberland counties responded to check it out, but no one found anything, said Chris Weidenhammer, deputy fire chief for the Fairview Township Fire Department. Those that went out included Fairview, Monaghan and Lower Allen townships.

The Fairview Township Fire Department posted on its Facebook page that officials even checked a pipeline but nothing was found.

No earthquakes were recorded. "It's a great mystery," Weidenhammer said.

Weidenhammer said he heard it at his house, too, and he started getting ready, knowing that they would get dispatched for a call. To him, it sounded like a transformer explosion, but it wasn't that, either.

People as far south as Manchester were even talking about it, Weidenhammer said.

Posts on Facebook garnered many responses from people who live in both counties. They reported hearing a loud boom and their houses shaking. That makes Jeri Jones, owner of Jones Geological Services, wonder if it was an earthquake.

"It sounds like it could have been a small earthquake from those reactions," he said.

Nothing was recorded on the seismograph at Millersville University, Jones said.

The northern area of York County has been rattled by small earthquakes in the past.

The Dillsburg area dealt with an earthquake swarm for a couple of years. It started with a 2.0 tremor on Oct. 5, 2008, and the booming and rattling occurred periodically until early 2010. The tremors were centered in an area along Old York Road and Brandon Lane in Carroll Township.

AccuWeather.com meteorologist Randy Adkins said he looked at conditions on Friday night, and he doesn't see anything weather-related to the boom. However, there was a temperature inversion, which can carry sound waves farther.

Jones said he welcomes any information about the boom. He can be reached at (717) 887-7103 or jonesgeo@comcast.net