But in some respects there is a good reason for this - the city has decided to completely recycle all of the waste rather than just dump it. The concrete is being crushed from each building and used in new aggregate. The steel rebar is being recycled. Everything is being repurposed and so the demolition going much more slowly than one would expect as normal.
liquefaction that occurred in the soils in and around Christchurch. This composite diagram of a photo (top) of a sand volcano and cartoon (bottom) shows what happened during and immediately after the quake. Water-saturated sand and clay was mobilized during the shaking and structures had no solid foundation to stand on. Look at some incredible photos of the effects of liquefaction here.
here. My next posting will be from Mt. Cook National Park.