A large slip which has created a lake between Wairoa and Gisborne is being monitored.
Hawke's Bay Civil Defence Emergency Management Group is working with local authorities to monitor the growing dam of water and sediment sited on the regional boundary between Wairoa and Gisborne.
The landslide, likely triggered by a small localised earthquake earlier this month, has resulted in approximately 80 million tonnes of material forming a large dam on Mangapoike River (a small tributary to the Wairoa River).
The new lake is about 50 metres deep and rising.
The area affected by the landslide is 25.8 hectares and the landslide is still moving.
No water is currently leaking from the dam, but it is rising by about 60cm each day.