A powerful magnitude 7.8 earthquake has struck New Zealand’s South Island early today and generated a tsunami and aftershocks. The quake struck in an area close to the city of Christchurch and was also felt in Wellington, the capital. No serious injuries are reported, though there were some minor ones. Authorities in the capital are urging people who work in the centre of the city to stay home. Wellington city officials said some large buildings were showing signs of structural stress and that the quake would like have caused damage to some buildings. The city’s suburban rail network was shut while crews checked tracks, bridges and tunnels. The quake collapsed a ferry loading ramp, broke windows and caused items to fall from shelves. It also forced hundreds of tourists onto the streets as hotels were evacuated. The quake brought back memories of the magnitude 6.3 earthquake that struck Christchurch in 2011, destroying much of the downtown area and killing 185 people. That quake was one of New Zealand’s worst disasters, causing an estimated $25 billion in damage.