A 7.1-magnitude quake last week flattened homes, schools, clinics and other vital infrastructure killing more than 200 people.
But a further 35,000 families need emergency shelter while more than 300,000 residents of Bohol island require assistance for basic needs like water, sanitation, food, and health services for six months, UN resident humanitarian coordinator Luizha Carvalho said.
"At this moment, the Philippines is the one (country) that really stands alone with the highest of needs and the highest requirements," Carvalho told a news conference.
"We have a very interesting pattern of several events that are happening almost simultaneously and we still hope for the generosity of the donors," Carvalho said.
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The UN Office for the Coordination of Humanitarian Affairs and the Philippines asked donor governments and aid groups to give more on top of those already providing for survivors of Typhoon Bopha and the Zamboanga conflict.
World Food Programme representative Praveen Agrawal said many quake survivors were still living under makeshift tents that would not stand up to heavy rain.
"We need to move fast. If we are overtaken by rains, the situation could become even more serious," he added.
Carvalho said UN aid agencies had only raised USD 43 million for victims of Typhoon Bopha, far short of the USD 76 million it originally sought to help rebuild lives after a storm that left nearly 2,000 people dead or missing in the south.
"The international community are very generous if they are able to see a good argument and a good case that is put together... And that is what we find in the Philippines," she said.