As Haiti counts the cost of last month's devastating earthquake, experts are warning of the potential for an even greater disaster in Nepal. Geologists said it is only a matter of time before a major earthquake hits Nepal's densely populated capital Kathmandu, where 2.5 million people live in cramped, poorly-built housing with little or no awareness of the dangers. Nepal sits on the border between two huge plates that have moved together over millions of years to form the Himalayas. Geologists believe it is at risk from an earthquake with a magnitude of around eight to ten times as powerful as the Haiti shock that killed more than 212,000 people.