Go to your backyard (exit at your Kitchen door), and and see whether the round have crach or sinking too? Or any sinking sign at car pourche?

If yes, it meant the ground is moving, else may not be lo..

any big project around your housing area and caused vibration?

WEll, this already give you explaination lol...when they doing the ground work, near by housing will get hits...My exiting house and new house all having similar issues...and the bad thing is we can't do much with it, except you have strong back ground...