"We should not cry or stay in mourning," one preacher told worshippers outside a damaged mosque in the center of destroyed Bawuran village. "We should thank God that we are still alive."
Adding to the concerns, nearby Mount Merapi volcano shot out large plumes of ash and sent lava down its slopes 35 times Friday.
The magnitude-6.3 earthquake that struck before dawn nearly a week ago killed more than 6,200 people and injured 30,000 more across a large part of Java Island. Officials estimate it destroyed 135,000 houses.
The massive relief effort came as Indonesia is still trying to rebuild from the 2004 tsunami, which killed 131,000 people in Indonesia's western Aceh province. Indonesia, an archipelago of 17,000 islands with a population of 220 million, is also fighting a spiraling human bird flu case load.
Local and international aid workers have yet to reach some remote areas in the quake zone, and delivery of food, medicine and tents to the estimated 650,000 people made homeless by last weekend's disaster has been sporadic in other parts.
Most of the survivors are living in makeshift shelters without toilets or running water.
An estimated $100 million will be needed in the next six months to address the most immediate needs, the U.N. Office for the Coordination of Humanitarian Affairs said. Nearly half of that money should go toward housing.
"The earthquake's large-scale destruction of water and sanitation facilities combined with large numbers of displaced survivors creates the potential for high disease and death rates," said Michael Kocher, International Rescue Committee regional director for Indonesia.
Although trucks loaded with humanitarian relief clogged recently repaired roads in some areas, villagers a few miles from aid distribution centers said they had received little or no help.
In Telan, a village in hardest-hit Bantul district, three families were crowded under one tarp.
"We are poor people. If we don't work hard, how can we survive?" asked one resident, Soliman, as he and his wife salvaged bricks, tiles and wooden posts from the remains of their house so they could start to rebuild.
Friday, the Islamic day of prayer, provided some respite from their suffering.
Around 100 people, several of them injured in the quake, prayed together on a road close to the devastated village of Telan. Afterward, they ate rice and fried bean curd together, while an aid worker from the capital, Jakarta, urged them to be patient.
"The event has helped me," said Ngatimin, who lost his only son in the disaster. "I am sure the village can be put back together again."
The situation appeared better Friday in Bantul's main hospital, which has treated thousands of patients since the quake. Volunteers cleaned up piles of garbage and U.S. Marines and Singaporean medical teams joined scores of Indonesian doctors.
More than 20 nations have either sent aid workers or emergency supplies.
"The obvious concern for the humanitarian community is to care for those who have gone through and lived through this disaster, in particular the injured and the homeless," said Charlie Higgins, head of U.N. relief operations.
Sari Setiogi, a World Health Organization spokeswoman, said there had been no outbreaks of diseases so far.
Indonesian Vice President Jusuf Kalla was quoted by the state-run Antara news agency as saying foreign governments and aid organizations should provide money to help rebuild homes instead of more medical workers.
Meanwhile, about 300 survivors suffered severe stomach pains and dizziness after eating donated food, police said Friday. Five villages in the Klaten district were affected after residents ate rice donated by a young man who has not been found, said Lt. Col. Lilik Purwanto, the local police chief.
Some remained hospitalized Friday, but their condition was not believed to be serious.