# The ground that moved: Christchurch liquefaction

After each of the two big shakes the surveyors drew every patch where the ground failed, 7,382 mapped patches, about 16,933 hectares of the city’s footprint. September 2010: 3,077 patches. February 2011: 4,305 patches.

## The suburbs, wettest first

- [Bromley](https://www.chch.live/bromley), 78.2% of its outline, 603 ha in February, 29 ha in September
- [Woolston](https://www.chch.live/woolston), 62.9% of its outline, 345 ha in February, 0 ha in September
- [Brooklands](https://www.chch.live/brooklands), 45.8% of its outline, 336 ha in February, 278 ha in September
- [Christchurch Central](https://www.chch.live/christchurch-central-city), 47.3% of its outline, 303 ha in February, 86 ha in September
- [Burwood](https://www.chch.live/burwood), 51.4% of its outline, 302 ha in February, 171 ha in September
- [Halswell](https://www.chch.live/halswell), 12.3% of its outline, 281 ha in February, 735 ha in September
- [Saint Albans](https://www.chch.live/saint-albans), 56.3% of its outline, 224 ha in February, 50 ha in September
- [Parklands](https://www.chch.live/parklands), 37.8% of its outline, 213 ha in February, 23 ha in September
- [Aranui](https://www.chch.live/aranui), 82.1% of its outline, 185 ha in February, 14 ha in September
- [Avondale](https://www.chch.live/avondale), 66.7% of its outline, 144 ha in February, 150 ha in September
- [Richmond](https://www.chch.live/richmond), 79.0% of its outline, 141 ha in February, 42 ha in September
- [Ouruhia](https://www.chch.live/ouruhia), 18.5% of its outline, 139 ha in February, 140 ha in September
- [New Brighton](https://www.chch.live/new-brighton), 32.6% of its outline, 133 ha in February, 76 ha in September
- [Bottle Lake](https://www.chch.live/bottle-lake), 10.5% of its outline, 131 ha in February, 57 ha in September
- [Mairehau](https://www.chch.live/mairehau), 28.5% of its outline, 129 ha in February, 21 ha in September
- [Shirley](https://www.chch.live/shirley), 45.5% of its outline, 125 ha in February, 42 ha in September
- [Wainoni](https://www.chch.live/wainoni), 84.9% of its outline, 122 ha in February, 40 ha in September
- [Sydenham](https://www.chch.live/sydenham), 39.4% of its outline, 120 ha in February, 1 ha in September
- [Linwood](https://www.chch.live/linwood), 41.7% of its outline, 118 ha in February, 28 ha in September
- [Hoon Hay](https://www.chch.live/hoon-hay), 29.6% of its outline, 114 ha in February, 13 ha in September
- [Ferrymead](https://www.chch.live/ferrymead), 44.9% of its outline, 111 ha in February, 8 ha in September
- [Spreydon](https://www.chch.live/spreydon), 41.7% of its outline, 110 ha in February, 0 ha in September
- [North New Brighton](https://www.chch.live/north-new-brighton), 54.7% of its outline, 109 ha in February, 1 ha in September
- [Marshland](https://www.chch.live/marshland), 11.8% of its outline, 103 ha in February, 4 ha in September
- [Coutts Island](https://www.chch.live/coutts-island), 8.6% of its outline, 103 ha in February, 154 ha in September
- [Merivale](https://www.chch.live/merivale), 48.6% of its outline, 101 ha in February, 54 ha in September
- [Somerfield](https://www.chch.live/somerfield), 39.3% of its outline, 97 ha in February, 0 ha in September
- [Waltham](https://www.chch.live/waltham), 51.9% of its outline, 92 ha in February, 0 ha in September
- [Fendalton](https://www.chch.live/fendalton), 44.6% of its outline, 88 ha in February, 57 ha in September
- [Kennedys Bush](https://www.chch.live/kennedys-bush), 5.7% of its outline, 84 ha in February, 133 ha in September
- [Avonside](https://www.chch.live/avonside), 69.4% of its outline, 84 ha in February, 94 ha in September
- [Dallington](https://www.chch.live/dallington), 61.4% of its outline, 82 ha in February, 248 ha in September
- [Edgeware](https://www.chch.live/edgeware), 81.7% of its outline, 79 ha in February, 218 ha in September
- [Phillipstown](https://www.chch.live/phillipstown), 58.7% of its outline, 73 ha in February, 0 ha in September
- [Belfast](https://www.chch.live/belfast), 7.0% of its outline, 71 ha in February, 108 ha in September
- [Hillsborough](https://www.chch.live/hillsborough), 9.2% of its outline, 62 ha in February, 0 ha in September
- [Bexley](https://www.chch.live/bexley), 27.7% of its outline, 60 ha in February, 188 ha in September
- [Saint Martins](https://www.chch.live/saint-martins), 47.8% of its outline, 55 ha in February, 0 ha in September
- [Strowan](https://www.chch.live/strowan), 33.7% of its outline, 46 ha in February, 10 ha in September
- [Bryndwr](https://www.chch.live/bryndwr), 18.8% of its outline, 40 ha in February, 1 ha in September

## Also in the earthquakes

- [The sequence](https://www.chch.live/sequence), every shake since 2010, counted
- [Earthquakes, live](https://www.chch.live/quakes), the ones that just landed
- [The faults](https://www.chch.live/faults), the traces under the plains
- [The land grades](https://www.chch.live/technical-categories), TC1, TC2, TC3
- [The red zone](https://www.chch.live/redzone), the land the Crown wrote off
- [The rebuild’s receipts](https://www.chch.live/rebuild), SCIRT’s photograph archive
- [The earthquakes, explained](https://www.chch.live/how-nz-works/canterbury-earthquakes), what happened and why
- [Liquefaction, explained](https://www.chch.live/how-nz-works/liquefaction), why the east failed
- [The rebuild, explained](https://www.chch.live/how-nz-works/rebuild), the machinery that put it back

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Environment Canterbury open data, the GNS/ECan post-quake mapping from aerial imagery and site visits. A patch is a footprint, not a finding about any one address; the point answer lives at https://www.chch.live/before. A patch files under the suburb its middle crosses.