Neath Port Talbot Council has said that up 150 homes in Ystalyfera could be affected by the ground movement that led to 10 homes being evacuated earlier this month.
“We are currently undertaking a traditional survey and a Lidar survey to get a better understanding of whether the wider community is implicated,” said council leader Rob Jones.
Jones said that 150 homes are currently on the council’s risk map and “we can’t predict where the landslides could occur”.
The council has planned a public meeting on 7 September where it has said it will share the results of the surveys and analysis currently being undertaken by the Earth Science Partnership.
Residents in 10 properties in Cyfyng Road were advised to evacuate their properties on 10 August and the council has since taken the decision to demolish one of the properties.