A strong new earthquake with a magnitude of 6.2 rattled New Zealand's South Island on Monday, hours after a more powerful quake killed at least two people, damaged roads and buildings and sent thousands fleeing to higher ground. Emergency response teams were already flying by helicopter to the region at the epicenter of the original 7.8 magnitude quake, which struck just after midnight some 91 km northeast of Christchurch in the South Island, amid reports of injuries and collapsed buildings.