Lets shake things up a bit.

[entropy]

SoCal recently had what they thought was a small earthquake but in actuality it was a sonic boom.

 

[WideOpen]

The ones that roll aren't bad, the shakers are usually the ones that do the most damage.

I'm guessing mine are rollers? I know little about them but that is how I'd classify them - like roller waves from a boat.

 

[Doom!]

I'm guessing mine are rollers? I know little about them but that is how I'd classify them - like roller waves from a boat.

Yep, that's exactly the right description.