The quake was centred 91 km north-northeast of Christchurch, the biggest city on New Zealand’s South Island. A 6.3 quake there in February 2011 killed 185 people and caused widespread damage. The tremor, which was measured by New Zealand’s Geonet at magnitude 6.6, was felt throughout most of New Zealand. Civil Defence said it was too early to assess the damage or whether there had been any injuries or deaths. “The whole house rolled like a serpent and some things smashed, the power went out,” a woman who gave her name as Elizabeth told Radio New Zealand from her home in Takaka, near the top of the South Island. A series of aftershocks were recorded around the country, some as strong as 6.1 magnitude.