Rapper Scribe makes moving tribute to the resilience of Cantabrians who have lived through more than 8500 quakes in the past year.

NZ's total of building trades workers needs to double to 155,400 over the next five years, say training groups.

Reactions included bed-wetting, tantrums, disruption to sleep and eating patterns and nightmares.

Around 4,000 aftershocks have rattled the Canterbury region since February 22, according to GNS Science records.