Earthquake

So, we've had these birds living in our roof somehow. At night we hear flapping and scratching while lying in bed. On Thursday night we finally figured out how to fix the problem with the birds, but wanted to wait until Friday because we didn't want to "close the birds" into the roof. Well at 5:30 on Friday morning we felt this shaking and heard the birds flapping...I thought the birds were coming in... scared me right out of my bed! An earthquake was not what we were expecting at all!