A specialist fire investigator will today examine the scene of a major fire on Marlborough's east coast.

The blaze, just north of Seddon, burnt through around 53-hectares of dry grassland in less than 24 hours - the cause of the blaze isn't yet known.

Principal Rural Fire Officer Richard McNamara says the team still have further work ahead of them.

"We'll fly a thermal camera over the fire ground, pick out any remaining hotspots and direct crews on from there."