Earthquake

Liquefaction Effects from the Cook Strait / Lake Grassmere Quakes

The recent magnitude 6.5 Cook Strait and  6.6 Lake Grassmere earthquakes were comparable in size to the ‘quakes that rattled Canterbury in 2010 and 2011.  This map of peak ground accelerations for the Lake Grassmere Earthquake shows recordings of up to about 0.75g.(or 0.75  the acceleration due to gravity). One of the notorious and extremely …

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Earthquake impacts in Marlborough seen from the air

Dougal Townsend of GNS Science was part of a team that flew over Marlborough to assess the impact of the recent earthquakes on the landscape and infrastructure. Although relatively minor compared to those that impacted the Christchurch area in 2010 and 2011, there were nonetheless some isolated, but significant effects. All these photos were taken …

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Lake Grassmere Quakes

Following the earthquakes in southern cook straight, the GeoNet rapid response team left immediately to place seismometers around the area, to allow more detailed monitoring and get better information with which to model the fault ruptures. This meant that when the Mag 6.6 occurred, the enhanced array of seismometers was already in place. Here is …

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Earthquakes in Southern Cook Strait

This is a screen shot of the Wellington seismometer from very early on Monday morning 22 July Following the earthquakes in Cook Strait over the weekend, it was impressive to arrive at work on Monday morning, and watch how the GeoNet team, many of whom had been busy right through the weekend, were in full …

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Turakirae

Photo: J.Thomson The windswept coastline between Wellington Harbour and Palliser Bay forms the southern tip of the Rimutaka Ranges. These hills themselves are an extension of the axial ranges that stretch the length of the North Island. This is the view east from Baring Head towards Turakirae Head. In good weather, this rugged environment isthe …

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NZ ShakeOut – why all New Zealanders should participate

GNS Science is very proud to support the NZ ShakeOut earthquake drill on September 26th. Watch the video if you don’t already realise why being aware and prepared for an earthquake is a good idea. The event, which will run right across the country at 9.26am, will prompt all of us to check our plans …

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“Drop, cover and hold on” is the best advice…

How to Respond to an Earthquake in New Zealand This article has been compiled by Karen Hayes at GNS Science with the help of experts including Julia Becker and David Johnston from GNS Science, and Adrian Prowse from the Ministry of Civil Defence and Emergency Management. Information about the ‘Triangle of Life’ has been disseminated via …

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Where was that earthquake and how big was it?

We have a new GNS Science video today that explains how scientists locate the source of an earthquake and then calculate the magnitude. John Ristau, from GNS Science’s GeoNet programme talks through the steps of the process… And in case you missed this earlier video, here is Matt Gerstenberger, describing how earthquake forecasts are made …

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Christchurch Quake Q&As

Kelvin Berryman (Image: Stuff.co.nz) The following questions were posted by a Christchurch resident on our GNS Science Facebook page. I think they are good questions which will be of interest to many people in the quake affected area.  I have re- posted them here, along with answers provided by Kelvin Berryman, a leading earthquake scientist at …

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