The Press: Earthquake trigger identified

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Scientists believe they have unearthed the trigger for the Canterbury earthquake.

Their potential breakthrough involves a second previously unknown fault under the Canterbury Plains.

Until now, the recently revealed Greendale Fault has been blamed for unleashing the magnitude-7.1 quake on September 4.

GNS Science seismologists working fulltime on the data recorded since then think the second fault may be responsible and provide the missing piece of the puzzle.