Survivors, many left homeless by the 7.3 magnitude quake that struck villages and towns in a mountainous area bordering Iraq, battled overnight temperatures just above freezing and faced another bleak day in need of food and water.
Iraqi officials said seven people were killed and 325 injured in Iraq, all in the northern Kurdish provinces.
The quake hit Azgeleh, but officials said the highest number of casualties were in Iran's Kermanshah province.
As part of its rescue and relief operations, the IRGC transferred the field hospital from Isfahan province to Kermanshah.
The Iranian Red Crescent said many areas lacked water and electricity and that aid supplies were being hampered by blocked roads. Meshkat told Reuters, "More people will die because of the cold".
Today, Iran marked a day of mourning, with a black banner adorning the corner of images of the disaster broadcast by state television to the tune of "Sad Lisa" by British singer Yusuf Islam, formerly known as Cat Stevens. Authorities said Iran's armed forces will be sent to help remove rubble.
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 quake.
He added that "psychological support teams" had been sent to these areas.
Also, 40 ambulances, 55 4WD vehicles, 9 rescue vehicles, and 5 helicopters have been dispatched by Relief and Rescue Organisation of the Iranian Red Crescent Society from the first hours of the morning for assistance.
Sunday's quake struck along a 1,500-km fault line between the Arabian and Eurasian tectonic plates, which extends through western Iran and northeastern Iraq.
Thirteen years later, a catastrophic quake flattened swathes of the ancient southeastern Iranian city of Bam, killing at least 31,000.