Yes, the February earthquake is considered as a separate quake. If you go to igns.cri.nz, you'll see some great graphics of seismic activity.
The Christchurch in New Zealand, had an earthquake of a 4.8 magnitude which happened on March 6, 2011 3:43am. This was an aftershock of the last months earthquake, February 22, 2011 which was 6.3.
Yes in a way they knew there would be an aftershock
182 people died in the Christchurch earthquake on 22 February 2011. 1 person died a few months later in an aftershock on 13 June.
Christchurch earthquake
The Christchurch earthquake happened on February 22, 2011. It was a devastating earthquake that caused significant damage and loss of life in the city of Christchurch, New Zealand.
6.3
Christchurch
RECENT AND HUGE On the 4th of September 2010 there was an earthquake magnitude 7.1 in Christchurch and then on 22nd of Febuary there was a 6.3 earthquake inb Christchurch
happens after a earthquake
a small earthquake that follows the main earthquake
Christchurch, New Zealand.
no ther wasnt an earthquake that i know of in jersey city but there was an aftershock from an earthquake from virginia felt in jersey city. the aftershock was in august 2011 but not sure what date. i think it was the 28. i know this because i actually felt it :)