Over the next few seconds the rupture spread upwards and towards the northwest, with the amount of slip increasing with time. The direction of movement—up and towards the northwest—focussed the energy of the earthquake towards Christchurch and helps explain the severe damage in the city.
The suburbs of Heathcote and Redcliffs lie above the fault, resulting in heavy damage and extensive rockfalls. Figure 3: Image indicating ground displacement made by combining satellite radar images taken before and after the earthquake. Each colour cycle represents 1. This article describes our understanding of the Christchurch earthquake fault as at the 8th of April, about 7 weeks after the earthquake.
We expect that details of the fault location and slip distribution will be updated in the future, as we incorporate more data and use more sophisticated data analysis techniques. For processing of the radar data: Mahdi Motagh. Privacy Statement Disclaimer and Copyright.
Staff Search. Recent Events Canterbury quake. Canterbury earthquake images. Monday 13 June pm NZ time , magnitude 6.
Friday 23 December 1. Media coverage Stuff. More information Information for children on New Zealand earthquakes and landslides. Description of an earthquake in the Burke Manuscript from Photographs of New Zealand earthquakes in our collection. Footer Menu. I want to Contact Us Christchurch City Libraries. Send feedback. It struck with with enough force to fling items off shelves and walls and push up liquefaction in Christchurch's streets. The 5. GNS seismologist John Ristau said it was another in the sequence of aftershocks following the quake - albeit a very big one.
GeoNet has recalculated the probabilities of aftershocks in the Canterbury region after yesterday's quake and now says there is a 63 percent chance of 5.
Dr Ristau said it was probable yesterday's tremor which occurred offshore, 15km from Christchurch, was on a fault that scientists did not know about. Christchurch quake, how it unfolded. University of Canterbury professor of earthquake engineering Brendon Bradley said the sequence of earthquakes since had moved east.
New Brighton experienced the strongest shaking yesterday, but by the time it had reached the city, the force had halved. As part of that trend, the latest earthquake was located offshore. Prof Bradley said the frequency of these quakes has decreased over time - and the chances of an 5.
While the peak ground acceleration measurement was 0. The epicentre of the the 5. Otago University professor of earthquake science Mark Stirling said the quake was a part of New Zealand's very old fault system.
He said it was impossible to locate all of the faults in the crust, as New Zealand had a long history of fault movement. It's a feature that's The type of faulting and resultant shaking pattern was similar in some ways to the magnitude 5. Some of the aftershocks from the most recent event are also strike-slip where rocks on opposing sides of the fault slide laterally past one another, like the magnitude 7.
As a consequence, liquefaction occurred in the places we expected it to, with the severity we would have expected for an earthquake of this size in this location. In case you were wondering, no liquefaction occurred in the land formerly occupied by my house, now owned by the Crown.
The shaking in this most recent earthquake was strong enough to cause loose rock to tumble from cliff faces around the coast. Many of these areas had already been well designated by the the Canterbury Earthquake Recovery Authority CERA and Christchurch City Council as high hazard Red Zones , which are areas of widespread land and infrastructure damage where repair or remediation are considered to be prohibitively difficult.
This certainly provided some validation for the power of science and technology to assist with land use zoning decisions. The tumbling of rock off of coastal cliffs continues to remind us particularly the kayakers, boaters and surfers that keeping a 30 to 50 metre separation from steep bedrock cliffs when out in the ocean reduces the risk of being hit by falling rocks.
For each of these magnitude 4s, we would expect ten magnitude 3 earthquakes and a hundred magnitude 2s.
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