On a sailboat and heard and felt it.

Siting by the pool, thought a plane was flying o er then ground started shaking!

it was huge but short

Θόρυβος και διάρκεια, όχι όμως δυνατός.

Short (1-1.5 sec) low rumble

Strong Kick

Strong short

3 second long, slight rumble below felt

Felt it on a beach

Heard the rumbling coming like a big truck and then the short shake making doors etc creak..