Nepal's prime minister has appealed for $US2 billion ($A2.47 billion) to rebuild his country, shattered by two massive earthquakes in three weeks that have killed thousands and devastated the impoverished nation's infrastructure.

On April 25 a 7.8-magnitude quake, the deadliest to hit the country in more than 80 years, killed more than 8500 people and destroyed half a million homes. That was followed weeks later by a second massive tremor that triggered landslides and brought down houses, triggering fresh misery for people…