The latest quake, which is understood to have struck 20 minutes before the building fell to the ground, claimed at least six fresh casualties and sent the death toll to more than 320.
Indonesian government rescue agencies were continuing to tally the number of deaths from Sunday's quake, which the National Disaster Mitigation Agency puts at 164.
Thousands of homes were damaged or destroyed in Sunday's quake and more than 150,000 people are homeless.
A strong aftershock has shaken the Indonesian island of Lombok where tens of thousands of people are homeless after a powerful quake on Sunday.
"Many patients here have broken bones and we handle it as much as possible because the hospital is damaged, impossible to do surgery and treat patients with severe injuries", she said. The chief of a search and rescue agency told the AP the death toll is at 227 as of Thursday.
Thousands of tourists visiting Lombok - as well as the nearby Gili Islands and Bali - have been evacuated or have chosen to leave since the weekend.
Some villages had "completely collapsed", said a Red Cross official in Lombok, Christopher Rassi. The agency says it is has not verified these other figures but expects the toll to climb.
"Falling rubble instantly paralyzed Mary Andoni from the waist down when Indonesia was shaken by one of its deadliest earthquakes in years".
"Aid is being distributed as quickly as possible upon arrival", Sutopo Nugroho, spokesman for the agency said in a statement, adding that hundreds of volunteers were assisting the efforts.
People ran into the streets and buildings were damaged.
The Indonesian Red Cross said it had set up 10 mobile clinics in the north of the island.
"We received information from our area team in West Nusa Tenggara that telecommunication access was down, while many people were still looking for their family members".
"We still have supplies for the next few days, but I'm not sure about after that", Billa Rabbani, a spokeswoman from the Peduli Anak orphanage, told AFP.
Aid groups say children are particularly vulnerable, with many sleeping in open fields and suffering illnesses from lack of warm clothing and blankets.