I have now lived in Dunedin for almost 7 years since moving from Sydney. Although NZ has 20,000 tremors per year, I have felt 2. One when I was in Queenstown and one when I was in Wellington. (I was overseas for the first Christchurch quake and on Stewart Island for the 2nd, they were felt in Dunedin. A few people say they felt the Kaikoura quake here, I was fast asleep).
While Christchurch has felt some of the Kaikoura shakes, there has been no damage. So just as safe to visit NZ as any other time.
The bus from Picton to Christchurch now goes inland over the Lewis Pass so takes longer but runs very day.
The inland road into Kaikoura is to be fully opened on Monday but there will be speed restrictions and some hold ups due to continuing road works. There is talk the coast road (Hwy 1) south to Christchurch may open before the end of the year but with restrictions. The road north will probably be closed for 6 months and the railway for over a year.
When people asked me why I moved here (and am now a NZ citizen) I said no heat waves or bushfires( I lived in the Blue Mountains), no snakes, no deadly spiders. However there are earthquakes.