On 20 march,2011 at 9.27pm there was a biggest aftershock. Moon Man In newyork city, at cristchurch there was a 5.1 earthquake. As the source said-"It was biggest aftershock since last month". There was not any harm to people.
This earthquake was possible, because moon was closest to earth at 9.44pm. Though the aftershock was long and big, but people are quite safe.