That's the question neighbors in several South Jersey communities started asking themselves ever since a loud bang followed several seconds of ground shaking around 11am Saturday.
"We heard this rumble. Boom, boom boom," said Joe Longmore of Ventnor City.
He and his wife Tara were enjoying the morning outside in their backyard when jolted by the powerful sound.
"It was totally different. I never felt anything like that," Tara Longmore said.
Most residents called it a "sonic boom" but the phenomenon lit up social media websites like Facebook and Twitter with many asking if it was an earthquake.
It turned out to be military aircraft flying over water according to several local government officials, but it was enough to get plenty of people talking.
Typically a sonic boom is achieved when something travels through the air faster than the speed of sound, such as a jet.
Officials would not elaborate on the origin of the boom.
Monday, May 13 2013 1:53 PM EDT2013-05-13 17:53:44 GMT
Mother's Day just wasn't the same for Olga Ortiz of Newark, NJ. She said her daughter Melissa Rodriguez of Collingdale, would have spent the holiday weekend with family up there, but has not been seen
Police consider rebooting investigation of missing Delco mother as her mother marks Mother's Day without her.
Sunday, April 7 2013 5:32 PM EDT2013-04-07 21:32:07 GMT
A Philadelphia firefighter from Ladder 27 died fighting a three-alarm blaze Saturday night in the city's Queen Village neighborhood. A second firefighter was injured.
A Philadelphia firefighter from Ladder 27 died fighting a three-alarm blaze Saturday night in the city's Queen Village neighborhood. A second firefighter was injured.
Friday, May 17 2013 11:44 PM EDT2013-05-18 03:44:01 GMT
A couple of Good Samaritans helped rescue a 3-year-old boy's lifeless body from an Allentown creek. Their quick thinking and help from police helped bring the boy back to life.
A couple of Good Samaritans helped rescue a 3-year-old boy's lifeless body from an Allentown creek. Their quick thinking and help from police helped bring the boy back to life.
Friday, May 17 2013 7:38 PM EDT2013-05-17 23:38:13 GMT
A woman who lived with a Delaware pediatrician accused of waterboarding her 11-year-old daughter has agreed to plead guilty to child endangerment charges and testify against him.
A woman who lived with a Delaware pediatrician accused of waterboarding her 11-year-old daughter has agreed to plead guilty to child endangerment charges and testify against him.
Friday, May 17 2013 6:26 PM EDT2013-05-17 22:26:23 GMT
When SEPTA trains roll into stations in Radnor Township, Main Line passengers aren't the only ones getting on and off. Police say criminals are now using the rails to pull off home burglaries.
When SEPTA trains roll into stations in Radnor Township, Main Line passengers aren't the only ones getting on and off. Police say criminals are now using the rails to pull off home burglaries here and make their getaway.
Friday, May 17 2013 6:08 PM EDT2013-05-17 22:08:49 GMT
A man in Montgomery County is determined to shock and disgust unsuspecting women, even if they're with their young children.If you were lucky enough to get outside Friday, to a place like the Perkiomen
A man in Montgomery County is determined to shock and disgust unsuspecting women, even if they're with their young children.
Friday, May 17 2013 6:01 PM EDT2013-05-17 22:01:38 GMT
Police are investigating a bizarre confrontation at a local elementary school. The alleged combatants were a grown woman and an 11-year-old girl. Some of the details are still a little twisted, reports
Police are investigating a bizarre confrontation at a local elementary school. The alleged combatants were a grown woman and an 11-year-old girl.
