The 2003 Fiordland earthquake struck the remote region of Fiordland in the South Island of New Zealand on 22 August 2003 at 12:12 am NZST. The epicentre was 12 km deep, and was thought to be near Secretary Island at the entrance to Doubtful Sound. At 7.2 Ms  magnitude, it was one of the largest quakes in the country for some time, and was the largest shallow quake since the 1968 Inangahua earthquake. There was an aftershock two hours later at 2.12 am, followed over several days by frequent small tremors; by 21 September, there were 6,365 aftershocks.