Predictions by some that the city's population would be decimated by the quakes had been blown out of the water.
Only a relatively small number of people had made the "big shift" overseas, Mr Parker said. Many of those who had left had lost their jobs and were looking overseas for work.
"And now what we are seeing is ... a growing demand here in the city for a variety of skills," Mr Parker said.
"We will, as a city, enter a phase some time in the next 12 months of actually starting on a curve of initially steady, then increasingly rapid growth as people move to this area for what is going to be five to 10 years of intensive activity, and that will create a raft of economic opportunities."
The mayor said the rebuild of damaged residential Christchurch was approaching, and within 100 days a blueprint for a new city centre would start to become reality, giving an "extra fillip of confidence".
The rapidly diminishing number of aftershocks was also helping.
"Certainty it's something that more and more people can see. Seeing is believing for a lot of us, and now we are starting to see the light at the end of the tunnel," Mr Parker said.
"Having said that, I am achingly aware of the people who are still concerned and waiting to get resolution from their insurance company. There's still a lot of that sort of waiting."
New Zealand had a seasonally adjusted net gain of 100 migrants last month - only the second monthly net gain since the February quake.
The country had a net loss of 3400 migrants in the year to March. Annual net migration has been negative since the October 2011 year, and peaked at 4100 in the February 2012 year.