Areas of Nepal remain perilously unstable following two major earthquakes with landslides posing an ongoing menace that will only increase when seasonal monsoon rains begin to fall in the coming weeks.

Geologists are rushing to identify the valleys, villages and towns most at risk from rock and mud falls, but resources are stretched as the country recovers from the devastating April 25 magnitude-7.8 quake that killed 8,000 people and left hundreds of thousands homeless.

Diwakar Koirala, deputy administrator in Sindhupalchowk district, which reported the most deaths in last month's disaster, said the latest magnitude-7.3 quake on Tuesday caused three more big landslides.