Pakistan's President Pervez Musharraf has asked for international help to deal with the earthquake in Kashmir.
The country needs large helicopters to reach people in cut-off areas, as well as tents, blankets and medicines.
Pakistan's military says more than 19,000 people have been killed by the disaster, and many more injured.
The quake measured 7.6 on the Richter scale of earthquakes, and was centred on the Pakistani part of Kashmir. It also hit India and Afghanistan.
The UK government is sending £100,000, along with 60 medical staff, emergency workers and foreign office staff.
A British search and rescue team has already arrived, and has pulled several people from the rubble.
In towns across the region, locals are working with their bare hands to clear the debris, but relief efforts are being held up by bad weather.
At least 400 children were killed when two schools collapsed in the north-western district of Mansehra.
It is thought to be the strongest earthquake to hit the region in a century.