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8722 posts

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  # 1671124 15-Nov-2016 09:42
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tdgeek:

 

ChCh CBD ok, not 220% but over 180%, Heathcote Valley was 220%

 

 

Wikipedia is not a source.

 

The 180%g reading was taken at the Pages Rd pumping station, not the CBD.

 

 

 


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  # 1671127 15-Nov-2016 09:46
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DarthKermit:

 

My god, there is an incredible amount of rubble to be shifted. I wonder where they'll find places to put it all?

 

John Key said that he saw from his helicopter trip slips as large as the one that closed the Manawatu Gorge for a year, times six or seven.

 

 

In ChCh they put a lot of hardfill into the Lyttelton port to extend the land, maybe in Kaikoura they can do something similar to add something on the waterfront to benefit the tourist industry. The pic/video of the three stuck cattle show the immense upheaval. Apparently, 100,000 landslides.


 
 
 
 


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  # 1671157 15-Nov-2016 09:53
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Wooaahh, felt it here as well. I was sitting in front of the computer and I was playing with huge excitement. First I felt like some big stones are falling on the rooftop. Then I figured, no it's an earthquake.


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  # 1671159 15-Nov-2016 09:54
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Perhaps they can. A lot of the rubble from the Manawatu Gorge slip was used for a roading realignment project about 10 or 15 km away on SH2, just north of Woodville. Obviously they have to transport the rock to places within a reasonable distance or the costs will be insane.


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  # 1671161 15-Nov-2016 09:55
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Fred99:

 

tdgeek:

 

ChCh CBD ok, not 220% but over 180%, Heathcote Valley was 220%

 

 

Wikipedia is not a source.

 

The 180%g reading was taken at the Pages Rd pumping station, not the CBD.

 

 

 

 

 

Correct, Wiki is not a source, it is merely a display of information, of which in this case, it references 256 sources. So the one or more sources brought about what I referred to are incorrect and your source is correct?  Going from past posts, I assume that is always the case.

 

Back to topic for me


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  # 1671162 15-Nov-2016 09:55
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Fred99:

Some old buildings got trashed but Christchurch was, for a short period, heralded as a shining example of how modern building codes saved lives.


Who was saying that? I never heard it. I did stumble across a tv doco from the 90's explaining how bad CHCHs buildings were, how %30 of building code wasn't enough and how building owners had been given an insanely long time to sort it out. They said death and destruction would result if nothing was done - and when nothing was done that's exactly what happened. I want to know who was saying it was a triumph and slap them.


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  # 1671164 15-Nov-2016 09:59
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DarthKermit:

 

Perhaps they can. A lot of the rubble from the Manawatu Gorge slip was used for a roading realignment project about 10 or 15 km away on SH2, just north of Woodville. Obviously they have to transport the rock to places within a reasonable distance or the costs will be insane.

 

 

I think that costs will be insane, is already accepted!


 
 
 
 


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  # 1671167 15-Nov-2016 10:02
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Wikipedia cites their sources, that doesn't mean they're good sources or that the article authors understood them. It's a small gramatical error but a big difference between CBD and city limi

tdgeek:

Fred99:


tdgeek:


ChCh CBD ok, not 220% but over 180%, Heathcote Valley was 220%



Wikipedia is not a source.


The 180%g reading was taken at the Pages Rd pumping station, not the CBD.



 



Correct, Wiki is not a source, it is merely a display of information, of which in this case, it references 256 sources. So the one or more sources brought about what I referred to are incorrect and your source is correct?  Going from past posts, I assume that is always the case.


Back to topic for me


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  # 1671170 15-Nov-2016 10:03
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PaulBags:
Fred99:

 

Some old buildings got trashed but Christchurch was, for a short period, heralded as a shining example of how modern building codes saved lives.

 

 

Who was saying that? I never heard it. I did stumble across a tv doco from the 90's explaining how bad CHCHs buildings were, how %30 of building code wasn't enough and how building owners had been given an insanely long time to sort it out. They said death and destruction would result if nothing was done - and when nothing was done that's exactly what happened. I want to know who was saying it was a triumph and slap them.

 

 

 

 

There were quite a few articles like this after the September quake:  Haiti's earthquake similar but deadlier than Christchurch's

 

 

 

 




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  # 1671178 15-Nov-2016 10:08
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USGS chart on reported shaking intensity vs distance from yesterday's M7.5.

 

 

Wgtn is at about 200km from the hypocentre of the quake.

 

I expect that the fact that reported shaking at that 200km distance and over is a little above the Atkinson-Wald California projections, and below the projection at 100km, is that the strike-slip part of the quake (which may have been multiple near simultaneous events) ruptured SW -> NE, directing energy to the North, shaking was more severe in Wgtn (at 200km) than Chch (100km).

 

MMI IV is about right IMO from my experience of the quake in Chch, I trust that the MMI V - VI is about right for Wgtn, and consistent with pga 25%g recorded.

 

What's missing from the chart is reports from close to the epicentre, partly because the area isn't highly populated, but mainly because power/communication was down, and people who'd just experienced probably MMI IX level of shaking have other things to deal with in the aftermath.

 

 

 

 


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  # 1671179 15-Nov-2016 10:09
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PaulBags: Wikipedia cites their sources, that doesn't mean they're good sources or that the article authors understood them. It's a small gramatical error but a big difference between CBD and city limi

 

 

 

True. But. What is the correct number? The correct source? being a number, it is an absolute. And being that type of specific number and measurement, and tied to a location as both posts are, which is correct???




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  # 1671182 15-Nov-2016 10:18
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jonb:

 

PaulBags:
Fred99:

 

Some old buildings got trashed but Christchurch was, for a short period, heralded as a shining example of how modern building codes saved lives.

 

 

Who was saying that? I never heard it. I did stumble across a tv doco from the 90's explaining how bad CHCHs buildings were, how %30 of building code wasn't enough and how building owners had been given an insanely long time to sort it out. They said death and destruction would result if nothing was done - and when nothing was done that's exactly what happened. I want to know who was saying it was a triumph and slap them.

 

 

 

There were quite a few articles like this after the September quake:  Haiti's earthquake similar but deadlier than Christchurch's

 

 

Yes.  My next door neighbour is a structural engineer / specialist in EQ design, one of my friends also a partner in a structural engineering firm.  I've sat there socially over glasses of wine, for soothing our nerves while being subjected to constant aftershocks that went on for months (then years).  That's what we did - it was "interesting times" in a very unpleasant way, but the topic of conversation you couldn't avoid because it was always there and always alarming - even before the big one hit.

 

They assured me how well things went for the CBD in 2010.  I believed them.




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  # 1671185 15-Nov-2016 10:40
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tdgeek:

 

 

 

 

 

Correct, Wiki is not a source, it is merely a display of information, of which in this case, it references 256 sources. So the one or more sources brought about what I referred to are incorrect and your source is correct?  Going from past posts, I assume that is always the case.

 

Back to topic for me

 

 

 

 

The chart I posted above was on the Geonet website, it disappeared when they did a revamp a few years ago.  The raw data is still there for download.  The figures on the chart don't tell the whole story though, IIRC that's lateral pga @1hz, as we know there was significant vertical acceleration (180%g at Heathcote - things flew in the air) which was not good for buildings, or nerves.

 

I could and did walk around during the EQ yesterday, bit wobbly on my feet, but no problem.  Having been knocked completely off my feet by EQs before, I realised quickly that it was large and relatively distant, when it kept going I was "certain" it must be the Alpine Fault, except the power was still on - I expect that when the AF quake happens, the power grid will shut down immediately - so in fact that happens about/at least 20 seconds before the first shaking will be felt in Chch.

 

Back to topic though and the significance of yesterdays quakes as an indicator of preparedness of Wgtn to face the inevitable, I think most people in Wgtn do realise that the Seddon quakes and yesterday were not "the big one".  I don't believe however that many Wgtn people have an understanding of how very far from being "the big one" these recent unpleasant events have been.


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  # 1671191 15-Nov-2016 10:47
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The Transmission Gully motorway is supposed to be open by 2020. I wonder what level of resistance to natural disasters has been built into its design and construction? It seems to me that the existing coastal SH1 near Pukerua Bay could very well look like the SH1 around the Kaikoura coast (covered in slips) if a quake struck close to it.


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  # 1671193 15-Nov-2016 10:53
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DarthKermit:

 

The Transmission Gully motorway is supposed to be open by 2020. I wonder what level of resistance to natural disasters has been built into its design and construction? It seems to me that the existing coastal SH1 near Pukerua Bay could very well look like the SH1 around the Kaikoura coast (covered in slips) if a quake struck close to it.

 

 

OMHO they cannot manage anything that can handle earth movement. About all I can think of, is to keep roads as far from hill sides as possible, but obviously, thats not always possible.  Stronger and more expensive roading, banks, that will be moved away, no issue. Grade it, level it, seal it, all we can really do.


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