He said there was severe damage to the control tower at Ha'apai Airport but that some flights carrying relief supplies had been able to land.
Most of the destroyed homes were built with light timber frames and iron roofs, Mr Aho said.
He said many residents lived subsistence lifestyles and may face food shortages after their crops were destroyed.
Foreign Affairs Minister Murray McCully announced yesterday that New Zealand would make $50,000 immediately available to respond to specific requests for assistance.
New Zealand's High Commissioner to Tonga travelled to Ha'apai yesterday to view the extent of the damage and assess what types of further assistance may be most useful
A New Zealand Air Force P3 Orion had completed an aerial damage assessment on behalf of the Tongan Government.
There are 146 New Zealanders registered with the ministry as being in Tonga, but there had been no requests for consular assistance from Kiwis in affected areas.
Transport infrastructure including roads, ports and airports are operational and relief supplies are being distributed.
Oxfam New Zealand spokeswoman Lucy Oakshott said the lack of communication was making it extremely difficult to know how bad the situation was.
"We can't get hold of anyone. We're well established there and we have lots of contacts but we can't get hold of anyone." APNZ, AP