Kōrero: Historic earthquakes

Aftershocks, 4 September 2010 to 21 February 2011

A key feature of the Darfield earthquake was its aftershocks. Many people were surprised by the severity and frequency of these. While aftershocks are common after large earthquakes they are usually not felt, as most large earthquakes in New Zealand since the 1931 magnitude 7.8 Hawke’s Bay earthquake have occurred in remote areas or their epicentres have been deeper. As the Darfield earthquake was shallow, so were most aftershocks. Their locations close to the South Island’s largest city meant that many people felt them and endured nights of broken sleep.

While most of the aftershocks were aligned along the Greendale Fault there was a ‘finger’ trending northwards from the epicentre and another cluster at the western end. The epicentre is also some distance from the surface rupture. Seismologists suggest these features indicate that the event was complex and involved multiple faults.

Te whakamahi i tēnei tūemi

Te Ara – The Encyclopedia of New Zealand

This item has been provided for private study purposes (such as school projects, family and local history research) and any published reproduction (print or electronic) may infringe copyright law. It is the responsibility of the user of any material to obtain clearance from the copyright holder.

Source: GeoNet

Ngā whakaahua me ngā rauemi katoa o tēnei kōrero

Te tuhi tohutoro mō tēnei whārangi:

Eileen McSaveney, 'Historic earthquakes - The 2010 Canterbury (Darfield) earthquake', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/mi/interactive/31156/aftershocks-4-september-2010-to-21-february-2011 (accessed 19 July 2024)

He kōrero nā Eileen McSaveney, i tāngia i te 12 Jun 2006, reviewed & revised 28 Mar 2011, updated 1 Nov 2017