[cripplecreek]

That would be kind of cool to see in action.

[CPT Clay]

Geologist bump

[JimSEA]

Remarkable. I wonder if the same thing can be found in CA with similar frequency of earthquakes?

[who_would_fardels_bear]

I thought this might end up being something like what happens at The Racetrack in Death Valley...

[decimon]

On the rocks ping.

[Deaf Smith]

"Quade said. "How do you erode a landscape that is rainless?"

Wind blown sand comes to mind. Note the ripples in the sand in the pics. His example pics also were mostly spaced apart rocks.

[hellbender]

I remember when an earthquake hit my area a year or so ago. I didn’t feel any vibration, but heard a rumbling/roaring kind of sound which I knew had to be a quake (didn’t sound like anything else, for one thing), and it was. It was all the rocks rattling along their joint planes and other fractures.

[Deaf Smith]

http://photojournal.jpl.nasa.gov/catalog/pia04997
Mars seems to have them too.

[Oatka]

Mysterious Moving Coffins

[MeneMeneTekelUpharsin]

Bump for reference. Interesting....

[tophat9000]

Boogie Boulders! ...cool

[Squeeky]

“the average boulder has experienced 50,000 to 100,000 hours of bumping and grinding while waiting for that nonexistent train.”

Well, at least they have something to keep them busy. Naughty boulders.