Christchurch's first major tremor of the year today was the 11,000th aftershock since the deadly earthquake sequence started on September 4, 2010.
The "moderate'' magnitude-3.3 shake just before 1pm was felt by more than 160 people across the recovering city, according to GeoNet.
It was located 6km deep, and 15km east of Christchurch.
Rebuild Christchurch tweeted: "Did anyone just feel that aftershock? Rolled on for a bit ...''
Another user said: "Bit of a boomer here in Sumner''.