Asghar Nawaz, the director-general at the National Disaster Management Authority, said that they were using trucks, eight helicopters and a military plane to provide aid across the country.
"The bad weather can delay the relief activities," he told reporters in the capital, Islamabad.
Nawaz made his comments after visiting towns and villages in the northwestern Khyber Pakhtunkhwa province that have been worst affected by Monday's magnitude-7.5 earthquake.
The temblor killed 396 people, including 272 in Pakistan, 121 in Afghanistan and three on the Indian side of the disputed Kashmir region.
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Authorities in the Khyber Pakhtunkhwa province today said 62 women and 57 children were 223 people killed in the province in the earthquake.
It damaged 35,492 homes in Pakistan, where government has promised to help people rebuild their homes. Nawaz said relief workers were also transporting aid to the country's quake-hit tribal regions bordering Afghanistan.