Updated 12.07pm: The official death toll in Nepal from Saturday's magnitude-7.8 earthquake has risen to 5,057 people.

A fresh avalanche in Nepal has left another 250 people missing.

The earthquake sparked an avalanche on Mt Everest, which decimated Base Camp.

Another avalanche has rumbled down a mountain in the popular Langtang trekking route.

Nepal has declared a state of emergency after the disaster, its deadliest in more than 80 years.

The country's National Emergency Operation Centre says nearly 11,000 people are injured and more than 454,000 have been displaced.

Distressing stories are beginning to emerge from some of the more remote areas in Nepal hit by the devastating earthquake.

World Vision spokesman Chris Clark says they've found extensive damage and there's urgent need for basic survival supplies.

He says search and rescue operations have yet to move into these rural areas and time is running out for those who haven't yet been found.

"These are communities that take, on a good day, three days walking to get to them. We've arrived in some of these villages to find every house destroyed. Children are hungry, because the houses have collapsed all the food is buried under rubble."

People in the capital are desperately seeking a way out of Kathmandu.

Thomas Bell, who lives in Nepal says bus companies are charging inflated prices to take people back to their villages.

"There's not enough food and water in the city, that's also the case in the village when they get there. They're worried about their families back in the village, and many are afraid of aftershocks still. There are high buildings in Kathmandu that haven't come down yet, but people say that they will."

Joanna Lumley - who has a long family connection with Nepal - has made a plea for help.

The actress says the disaster is catastrophic, and under the chaos are more bodies and possibly even people still alive.

She's urged people to donate to those helping with the aftermath.

Miraculous survival

A man's been pulled alive from the rubble, more than 80 hours after the Nepal earthquake.

The 28-year-old was rescued from a collapsed apartment block in Kathmandu.

He'd been trapped in a room with three dead bodies.

The man had no access to food or water during his ordeal and rescuers say he survived by sheer willpower.

Fundraising

The Wellington Nepalese community is doing its bit to help those in need in Nepal.

Today the Nepalese Society of Wellington will fund raise across the city, by way of a street appeal.

A message on their Facebook page is calling for anyone available to help to get in touch.

All funds raised by the group will go through the New Zealand Red Cross.