The game was scheduled to be played in Christchurch, however was moved north after February's quake damaged AMI Stadium.
The jolt shock the stands at the Hagley Park fan zone, and was definitely large enough to be cause for concern straight after it struck, Mr Parker said.
"It felt sharp enough to worry me but I haven't had any reports of anything too significant, so that's a relief."
The mayor said no one in the crowd seemed too worried about the "wobbly" quake and most stayed at the park after it struck.
"Everyone was very relaxed because we were out in the open. Nothing fell over or tipped up and the power stayed on.
"It was a very significant one and we were all bouncing around a little bit ... But there were quite a few people jumping up and shouting at the ref, and I don't think they even noticed."
Aftershocks have been keeping Christchurch on edge since the 6.3 magnitude quake on February 22 that killed 181 people and caused billions of dollars worth of damage.
That quake was an aftershock of an even bigger 7.1 quake in September last year, which caused extensive damage but no deaths.
Last night's jolt was the eighth largest to strike the area since September 4 last year.
