Understanding the massive 7.0 Christchurch Earthquake

The September 3, 2010 South Island, New Zealand earthquake occurred as a result of strike-slip faulting within the crust of the Pacific plate, near the eastern foothills of the Southern Alps at the western edge of the Canterbury Plains.
The earthquake struck approximately 50 km to the west-northwest of Christchurch, the largest population center in the region, and about 80-90 km to the south and east of the current expression of the Australia:Pacific plate boundary through the island (the Alpine and Hope Faults).

The earthquake, though removed from the plate boundary itself, likely reflects right-lateral motion on one of a number of regional faults related to the overall relative motion of these plates and may be related to the overall southern propagation of the Marlborough fault system in recent geologic time.

Today's earthquake occurred approximately 50 km to the southeast of a M7.1, surface-rupturing event in Authur's Pass, on March 9th, 1929, which caused 17 fatalities. More recently, two earthquakes of M6.7 and M5.9 occurred in June 1994 approximately 40 km to the northwest of today's event, but did not cause any known fatalities or significant damage.


  1. Earthquakes cannot be predicted. Historic events in a certain area are the only clues science has to predict the kind of quake which can occur.
    A serious quake (to be compared with the Christchurch earthquake) was the Baja California earthquake from April 4. Magnitude and kind of quake was fairly similar. Very few to no casualties was another comparison. Damage will always occur, but the kind of damage in the developed world is much much less than in undeveloped countries with poor house construction.

  2. judith shapland says

    At what point will the San Andreas fault be triggered?