If you felt a mysterious shaking this morning, you are not alone.

Folks in the Five Cities Area called our newsroom early this morning reporting they felt an earthquake. Turns out, people as far away as Santa Maria to Los Osos also felt shaking.

One San Luis Obispo woman tells us she saw her windows shake three times about five minutes apart.

"It really shook, and I though we're having an earthquake, but nothing else was shaking. So I don't know. Just the windows? Just the windows," said Clarice Bell of San Luis Obispo.

The U.S. Geological Survey is not reporting any earthquakes in our area.

Today's shaking is consistent with past sonic booms. Action News contacted several military bases across the region but none would confirm that that was the cause this morning.