The Eketahuna quake struck at 3:52 pm on Monday afternoon, and was centered 15 km east of Eketahuna, under the south-east of the North Island. The quake was felt strongly in both islands, and we have received over 9000 felt reports from the public, with multiple reports of damage. The focal mechanism shows it to be a normal fault earthquake.
An aftershock sequence is ongoing following this earthquake and includes numerous magnitude 4 events. As with any aftershock sequence, we cannot rule out the possibility of occurrence of future larger earthquakes.
What are the probabilities of future significant earthquakes?
Up-to-date aftershock forecasts are now located on the 'Future Scenarios and Aftershocks' page in the News Section of our website.
Current depth and location estimates of this event place it below the interface between the subducting Pacific plate and overriding Australian plate. Maximum peak ground acceleration recorded by GeoNet instruments is about one quarter of the acceleration due to gravity (0.26 g). This measurement was recorded in Woodville. Relatively strong shaking was also recorded on the Kapiti Coast (e.g. up to 0.2 g in Paraparaumu) whereas accelerations recorded in Wellington city were less than 0.05 g. In comparison, ground motions recorded in Wellington during the recent Cook Strait earthquakes ranged up to 0.26g.
The seismology team at GNS Science is also attempting to understand the earthquakes in the context of recent and ongoing seismicity. Specifically, efforts are aimed at comparing the current earthquakes with a sequence of events that occurred to the north of Eketahuna in the early 1990s. We are also considering possible links to the ongoing Kapiti slow-slip event.
The likelihood of a larger triggered event in the coming weeks is minor. However, it is possible and we should all take this opportunity to review our earthquake emergency plans.
What are the numbers so far?
Numbers of Eketahuna region earthquakes
|Magnitude range||15:52 pm, 20 January 2014 to|
08:40 am, 27 January 2014*
|6.0 - 6.9||1|
|5.0 - 5.9||0|
|4.0 - 4.9||8|
|3.0 - 3.9||75|
|*This table will no longer be updated. Up-to-date aftershock tables are in 'Our News' section|
- GNS Science and GeoNet have deployed three strong motion sensors to the region to supplement the permanent GeoNet network, you can read about the deployment via the GeoNet blog
- Our Landslide response team are currently asking for public reports on landslides,on private property in the areas affected, please send any information to firstname.lastname@example.org