Hi
came across a few references to this permafrost slump, induced by land clearing and subsequent heating in Siberia.
I hadn't really understood the depth of the permafrost or it's potential fragility, but the images (especially the close-ups further down the thread) put it into some perspective.
http://googleearthcommunity.proboard...crater-siberia
Definitely haven't posted this to start a war over global warming or anything - was just gob-smacked to see the geological reality behind the term "permafrost". If you haven't already come across it, hope you also find it interesting - thanks for looking. regards Ray