Chopper Ground Resonance?

[FLEXPWR]

A helicopter broke into pieces after touch down, due to some sort of "ground resonance".

Link here (in French):
Un hélicoptère se désintègre littéralement - Yahoo!

Anyone familiar with this phenomenon? Seems there was no defect prior to the event.

[Senior Pilot]

Ground resonance is a well known helicopter phenomena, and can catch the unwary. Discussion about this event and how to handle it in Rotorheads

[FLEXPWR]

Thanks a lot,

Never seen it before, although obviously it's a well documented occurence.

Flex