About 540 people were killed and close to 8,000 injured when the quake hit near the Iran-Iraq border on Sunday, reports BBC.
Iranian President Hassan Rouhani has visited the quake-stricken area and promised the government "will use all its power to resolve the problems in the shortest time".
Survivors spent Monday night in makeshift camps or in the open.
About 193 aftershocks have been felt. We need help. We need everything.
"It is a very cold night".
A woman sits on the debris on the natural disaster site in Sarpol-e-Zahab in western Iran.
Kermanshah's provincial officials said about 12,000 houses both in urban and rural regions across the province have been totally damaged due to the strong natural disaster.
The head of the elite Revolutionary Guards, Major General Mohammad Ali Jafari, said the immediate need was for tents, water and food.
The Iranian Red Crescent said many areas lacked water and electricity and that aid supplies were being hampered by blocked roads.
So far, rescue operation and assessment is being conducted on the ground and relief items including tents, ground sheets, blankets, kitchen sets, and food items such as canned food and rice are being distributed among the affected people and the people staying outdoor, scaring of getting back to their houses.
About 30 Red Crescent teams are working in the natural disaster zone, Irna reported.
The epicentre of the quake was near the border, 20 miles southwest of the city of Halabjah in Iran.
Hundreds of ambulances and dozens of army helicopters were reported to have joined the rescue effort after supreme leader Ayatollah Ali Khamenei ordered the government and armed forces to mobilise "all their means".