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Il permafrost è uno strato di suolo e roccia perennemente ghiacciato che può raggiungere anche diverse centinaia di metri di spessore. In Svizzera la sua distribuzione è eterogenea, discontinua e generalmente si sviluppa nelle Alpi al di sopra del limite del bosco. I mutamenti climatici in corso concorrono allo scioglimento di questa struttura che finisce per disgregarsi e favorire possibili frane, cadute di massi e colate detritiche. Per questa ragione il suo monitoraggio, soprattutto nei territori che possono generare pericoli per gli insediamenti umani, è di fondamentale importanza…ma non di facile realizzazione.
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