Southern Highlands Governor William Powi said people were feeling traumatized from the disaster and ongoing aftershocks. The latest large temblor was a magnitude 6.7 quake that struck just after midnight Tuesday.
It was the strongest shake since the Feb. 26 deadly magnitude 7.5 quake that destroyed homes, triggered landslides and halted work at four oil and gas fields.
The central region where last week's quake struck is remote and undeveloped, and assessments about the scale of the damage and injuries have been slow to filter out. Powi said he didn't know if the latest aftershock had caused more injuries or damage, but he said it had added to the distress people were feeling.
"It is beyond the capacity of the provincial government to cope with the magnitude of destruction and devastation," he said. "Our people are traumatized and finding it difficult to cope."
Powi said provincial authorities were trying to prioritize the greatest needs by getting people with severe injuries to medical centers and providing water and medicine. He said help from abroad and from local aid agencies was slowly coming in.
"It's a mammoth task. Most of the feeder roads are washed away or covered with landslips," he said. "People's livelihoods are devastated, their personal property is gone."
Powi said 39 people died in his province after families were crushed by their collapsing homes or buried by landslides during last week's earthquake. He said death reports were still coming in from remote places, and he feared the death toll would rise to over 100.
A spokeswoman at the National Disaster Centre said the official death toll is currently estimated at between 55 and 75, although they don't yet have firm numbers.
The U.S. Geological Survey said Wednesday's quake was centered 112 kilometers (70 miles) southwest of Porgera at a shallow depth of 10 kilometers (6 miles). Ten aftershocks in the hours since ranged between magnitude 4.7 and 5.2.
Papua New Guinea is home to 7 million people on the eastern half of the island of New Guinea, to the east of Indonesia. It sits on the Pacific's "Ring of Fire," the arc of seismic faults around the Pacific Ocean where most of the world's earthquakes and volcanic activity occur.
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