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 ; up to 21 September there were 6365 aftershocks
1968 Inangahua earthquake
1968 Inangahua earthquake
2003 Fiordland earthquake