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The 4 September earthquake was caused by movement along the Greendale fault (a break in the rocks below the earth's surface) near to Christchurch. It happened when the forces within the earth became greater than the friction holding rocks together. As the rocks moved the vibrations caused the ground to shake. The fault had been hidden below the gravels of the Canterbury Plains.

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13y ago
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6mo ago

The Canterbury earthquake in New Zealand occurred due to the rupture of the previously unknown and active fault known as the Greendale Fault. This fault had been building up stress over time and eventually released in a shallow earthquake on September 4, 2010, causing significant damage to the Canterbury region, particularly Christchurch.

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Q: How did the Canterbury earthquake occur?
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