Almost a month after a deadly earthquake, Papua New Guinea is struggling to get aid to desperate survivors, having allocated just a fraction of its relief funds, while a rent dispute left disaster officials briefly locked out of their offices.

The scale of the emergency is testing the finances and capacity of one of the world's poorest countries, disaster and relief officials say, after the magnitude 7.5 quake rocked its remote mountainous highlands on Feb. 26, killing 100 people.

Thousands of survivors have walked to remote airstrips and jungle clearings, awaiting helicopters bringing supplies of food, water and medicines, aid agencies and authorities say.