Christchurch mayor Bob Parker says hard questions will have to be asked about areas of Christchurch hit again by earthquake damage.
Prime Minister John Key has said that some areas of Christchurch may be re-zoned red - meaning too damaged to rebuild on - in light of the series on earthquakes on Friday that renewed damage and liquefaction.
The eastern suburb of Parklands was one of the hardest hit with mountains of silt piling up from liquefaction and water and sewerage out of action for more than 24 hours.
Mr Parker said the Canterbury Earthquake Recovery Authority (CERA) will reinvestigate areas which may need to be rezoned, including Parklands.
He told Summer Report that decisions on zoning have been "pretty much right" but there was a genuine need to re-evaluate "around the edges of those decisions" following the latest quakes.
Mr Parker says he would expect CERA to assess newly damaged areas for possible rezoning within the next month or two.
Properties in Parklands are among 28,000 declared part of the Blue Green zone, which means the residents can stay in their properties.
Of these homes, 3000 - 4000 will need to be rebuilt with new piles capable of withstanding liquefaction.
Pattern of quakes likely to continue
Kelvin Berryman of GNS Science told Summer Report the quakes on Friday were a similar pattern to those in February and June.
He said this is likely to continue but areas which have been closest to the quakes so far may not be the centre for future events.