Facebook users were quick to discuss why their homes felt like they were 'shaking' across Townsville this week, and this is why.
The air force have begun exercise High Sierra, with pilots taking part in high complexity air combat training.
The roars of the F/A 18 Hornets have been so mighty that many locals have said their homes have had a 'shaking' like feel.
The exercise will be ongoing until Thursday, June 21- at least you know now that it's nothing more than that!
Have you felt/heard it? Tell us on Facebook!