Source: https://www.infohelp.co.nz/quake.html
Lyttelton volcano revival discounted “Some people have even expressed fears the extinct Lyttelton volcano might be coming back to life. However, recent Canterbury University geology doctoral student Dr Sam Hampton said there was no evidence of volcanic activity. The Lyttelton volcanic complex finished erupting 5.8 million years ago. Hampton said he had discovered recent faulting at Allandale, where the road was cracked and the centreline had been offset by one to two centimetres. Also as a result of faulting, outflow from warm springs at the northern end of Rapaki Bay had increased. There were six sulphurous springs of up to 20 degrees Celsius within about 60 metres of the beach and oriented west-east, he said. ‘The distinct sulphurous smell associated with these hot springs and other outflows is due to water coming up from depth, much like Hanmer Springs, and not to do with magma-water interactions'” The Press 11Sept + Underground water shaken up by fault “Some farmers say their paddocks have never been wetter. ECan acting director of investigations and monitoring, Tim Davie, said the quake could have a lasting impact, with some wells broken. No lasting large-scale changes were expected to aquifers. Sulphurous smells were being reported around the region but it was unlikely they were all related to new springs, he said. ‘My view is it’s some of the peat that’s been exposed to air oxidising'”