Sub 4.2 earthquakes feel like a truck rumbling by your house (if you have an old house/apartment). I used to live on a busy street in SF and whenever there was

Sub 4.2 earthquakes feel like a truck rumbling by your house (if you have an old house/apartment). I used to live on a busy street in SF and whenever there was an earthquake it was always ... was that a large truck or an earthquake. Only when it keep rattling did it really differentiate.