Trajectories of posttraumatic growth and depreciation after two major earthquakes. That may seem surprising, as Invercargill gets more earthquakes than Dunedin. But it really was bad luck that the spate of Christchurch earthquakes were almost right below the city and at very shallow depths. this seismic cycle could last years rather than weeks/months. In Canterbury, where the fault lines are buried beneath the shingle, and where there has never been a Magnitude 8 earthquake within recorded history, the risk was assessed much lower. I’d ‘predict’ many years of major quakes every few months, less severely felt in the city with the passage of time, followed in each case by many weeks of minor local shaking all along the previous path.The reality is that none of us, including the supposed experts, can predict what will happen next. There may be a greater likelihood for these to occur in North Canterbury and along the Kaikoura Coast than in South Canterbury.When I was young, and indeed until recently, the conventional wisdom was that Wellington was the region of New Zealand with the highest earthquake risk.
All major North island earthquakes – such as the Napier earthquake of 1931 and the Wairarapa earthquake of 1855 – lead to the land being uplifted by what is known as ‘subduction’ of the Pacific Plate, which gets squeezed beneath the Indo-Australian Plate. Shaking in the centre of Christchurch, which caused a lot of damage, was much stronger than in the 4 September 2010 earthquake, partly because it was much closer to the epicentre. was is subduction ? The cost of the rebuild is set to be $16 million.The earthquake combined with the urgency created by the unseasonably early break-up of sea ice on the 185 people from more than 20 countries died in the earthquake.Immediately following the earthquake, 80% of Christchurch was without power.
(2015). But these earthquakes tend to be at considrable depth (where the Indo plate is slipping under the Pacific Plate) and this dampens the effect for Invercargill.
Do you have any theories on this at all?
It is estimated that 10,600 people moved away from Christchurch, with the 1,700 people difference to the population loss explained through some people moving to Christchurch.
There is a lot of good material ‘out there’, but much of it assumes a prior knowledge of geology. A slightly smaller earthquake three days previous was at about 40km. Typically, each major earthquake on the Alpine Fault is of Magnitude 8 or greater. Top: Divergent The effect in Christchurch from a Magnitude 8 earthquake on the Alpine Fault would likely be similar to the Canterbury 7.1 earthquake of September 2010, but hopefully much less than the 6.3 eathquake of 22 February 2011, which was almost underneath the city and at very shallow depth.
If I had to guess on the safest city in the South Island it would be Invercargill. Kuijer, R.G., Marshall, E.M., & Bishop, A.N. An 8.5 or even greater earthquake, which is defintely possible, hardly bears thinking about. Most of these faults fracture at intervals between 500 and 2500 years. Also, on that, do you think we could have another CHCH shallow quake on the east again? And in the centre the two hookers pop up. "However all earthquakes in the Christchurch region will be shallow, so the effect of a given earthquake will be worse than from a deeper plate boundary earthquake of the same magnitude." Whether the risk going forward is actually more in Christchurch than in Wellington I do not know. Isn’t that what we’re seeing now between ChCh and Kaikoura? But it really was bad luck that the spate of Christchurch earthquakes were almost right below the city and at very shallow depths.
Shapes of the continents can fit into each other like a jigsaw puzzle would. ... We will be doing everything we can to work with our New Zealand family, with Prime Minister Key and his emergency services personnel, his military officers, his medical people, his search and rescue teams. The events around Canterbury are examples of common geological phenomena associated with earthquakes. Over many millions of years the uplift has totalled about 20,000 metres, but erosion has limited the mountain tops to less than 4000 metres.
What I did learn along the way is that there is general agreement about that big picture, but the details can be debated, even by the so-called experts. He specialises in volcanoes.
I find your posts very fascinating and they make for excellent and informative reading. These are caused by the Pacific Plate being forced downward, with some of that having occurred nany millions of years ago.In Fiordland, at the southern end of the country, the reverse is occurring. Fergusson, D.M., Horwood, J., Boden, J.M., & Mulder, R.T. (2014).
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what type of plate movement caused the christchurch earthquake 2011