It was one of the most damaging to hit Britain during the twentieth century, with a small area reaching an intensity of VII on the Medvedev–Sponheuer–Karnik scale.

At 9.45am on 27 June 1906, a powerful earth tremor was felt across much of South Wales, its epicentre being placed just offshore of Port Talbot.

The quake, which struck just a few weeks after the devastating 1906 San Francisco earthquake, was felt as far afield as Ilfracombe, Birmingham and southwest Ireland.

The earthquake was felt by many people, though recorded injuries were minimal: a young man, Thomas Westbury, and a three-year-old boy, Thomas Lewis, were hit by falling bricks and a girl was injured by the toppling of tin plates at Cwmavon.

Reports told of bricks falling from chimneys across the city[4] and the Mumbles lighthouse "rocked on its foundations.