Last month's Dudley earthquake was more powerful than at first thought, according to geologists.

The quake, which hit on 23 September, was first registered at 4.8 on the Richter scale but has since been upgraded to 5.0 by the British Geological Survey.

The exact centre of the most powerful earthquake to hit Britain for a decade was thought to be Brick Kiln Lane in Dudley.

But the survey revealed the epicentre was actually a few miles down the road at the junction of High Arcal Road and Himley Road, near Himley Hall.

UK earthquakes (Richter scale)

6.1, 120km off Great Yarmouth, 1931 5.4 Lleyn, north Wales, 1984 5.1 Bishop's Castle, Shropshire, 1990 4.2, Warwick, 2000 4.1, Melton Mowbray, Leicestershire, 2001

The earthquake - which started at 0054 BST and lasted about 20 seconds - has also been given a revised intensity rating of six compared with the four it was first given.

It caused minor damage and was felt across the West Midlands, Wales, North Yorkshire, London, and Wiltshire.

The new findings come after the British Geological Survey in Edinburgh studied data received from monitoring points around the country.

Thousands of people have relived their experiences of the earthquake for the survey which asked people to fill in a questionnaire online.

Many reported animals and birds acting strangely before and after the tremor.