Effects on the Natural environment

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Geography

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8 Terms

1
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How many tonnes of silt were removed from the greater Christchurch area?

900,000 tonnes

2
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How many tonnes of sediment clogged the rivers killing native fish and insects?

21,500

3
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How many tonnes of silt came to the surface due to liquefaction?

400,000

4
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Where was liquefaction worst?

the eastern suburbs such as Aranui, Bexely and New Brighton

5
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How much of the Avon-Heathcote estuary was covered in Liquefaction mounds?

40%

6
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What changed the ecology of the waterways?

The sewage

7
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What is liquefaction?

Liquefaction is the process by which the earthquakes violent movements suddenly turns loose soil into liquid mud

8
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Where does liquefaction usually occur?

The top 4-5 metres