"New Zealanders living in the city of Christchurch (population 377,000) on the South Island's Canterbury Plains were hit hard Tuesday by 6.3-magnitude earthquake, an aftershock from September's 7.1-magnitude quake. Prior to these two seismic events, Canterbury Plains likely had not experienced an earthquake in thousands of years. In fact, scientists did not even know there was a geological fault there until it ruptured last year."