Earthquake 16-8-2013

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#879736 16-Aug-2013 19:00

PaulBags: Not to sound insensitive but was there actually any damage? I mean, other than a couple of glasses and bottles?

Paul has a point, Welly is built for quakes, CHCH wasn't and suffered. Had mates calling me all day to see if we were still alive, first thing we did was screw our new Willianswarn (thanks beervana) to the floor, then shot into town and picked the wife up. Priorities.

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#879747 16-Aug-2013 19:15

PaulBags: Not to sound insensitive but was there actually any damage? I mean, other than a couple of glasses and bottles?

*sigh*

Here is a crazy notion, lets give peace a chance.

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#879748 16-Aug-2013 19:16

Magnitude only tells you how much energy was released. It's useful, but doesn't tell you how violent the shaking was, how long the shaking went on for, etc.

Being from Christchurch, when I hear the motion was 'rolling', I think either far away and/or not really damaging. I would describe February 2011 as 'coked up epileptic washing machine'. And you can get strange small quakes too, like a mag ~2 aftershock we had centred almost right under our house, it lasted a split second, sounded and felt like one of the piles suddenly rammed the floor; and yet was recorded as unnoticeable. Indeed we probably were the only people to notice it.

@kiwitrc: Wellington is built on pretty solid ground, Christchurch is built on a swamp. Some of those buildings that came down in ChCh CBD were likely sitting on old waterways, would be interesting to see some old water board maps. Oh and the rivers that haven't been dredged for who knows how long, pushing the water table up even before the quakes.

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#879750 16-Aug-2013 19:17

I tell you what. It last longer than the previous one and the house shook a lot more than before. It also had more aftershocks.

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#879753 16-Aug-2013 19:21

PaulBags: Magnitude only tells you how much energy was released. It's useful, but doesn't tell you how violent the shaking was, how long the shaking went on for, etc.

Being from Christchurch, when I hear the motion was 'rolling', I think either far away and/or not really damaging. I would describe February 2011 as 'coked up epileptic washing machine'. And you can get strange small quakes too, like a mag ~2 aftershock we had centred almost right under our house, it lasted a split second, sounded and felt like one of the piles suddenly rammed the floor; and yet was recorded as unnoticeable. Indeed we probably were the only people to notice it.

@kiwitrc: Wellington is built on pretty solid ground, Christchurch is built on a swamp. Some of those buildings that came down in ChCh CBD were likely sitting on old waterways, would be interesting to see some old water board maps. Oh and the rivers that haven't been dredged for who knows how long, pushing the water table up even before the quakes.

Wellington is built on crumbly rock and reclaimed land , this is not solid

Here is a crazy notion, lets give peace a chance.

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#879757 16-Aug-2013 19:41

Very big wobble/sway high up in the Majestic Centre. Felt quite dizzy after that! Then walked down a million stairs and sat in a bus for almost 2 hours. Fun times!

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#879760 16-Aug-2013 19:53

It was quite a relief too, let me tell you, when Civil Defence announced there was no tsunami risk from this particular land-based earthquake.

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#879771 16-Aug-2013 20:09

KiwiNZ:
PaulBags: Magnitude only tells you how much energy was released. It's useful, but doesn't tell you how violent the shaking was, how long the shaking went on for, etc.

Being from Christchurch, when I hear the motion was 'rolling', I think either far away and/or not really damaging. I would describe February 2011 as 'coked up epileptic washing machine'. And you can get strange small quakes too, like a mag ~2 aftershock we had centred almost right under our house, it lasted a split second, sounded and felt like one of the piles suddenly rammed the floor; and yet was recorded as unnoticeable. Indeed we probably were the only people to notice it.

@kiwitrc: Wellington is built on pretty solid ground, Christchurch is built on a swamp. Some of those buildings that came down in ChCh CBD were likely sitting on old waterways, would be interesting to see some old water board maps. Oh and the rivers that haven't been dredged for who knows how long, pushing the water table up even before the quakes.

Wellington is built on crumbly rock and reclaimed land , this is not solid

Sounds more solid than water logged sand, but point taken.

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#879773 16-Aug-2013 20:11

kiwitrc:

Paul has a point, Welly is built for quakes, CHCH wasn't and suffered. Had mates calling me all day to see if we were still alive, first thing we did was screw our new Willianswarn (thanks beervana) to the floor, then shot into town and picked the wife up. Priorities.

You got a Williamswarn and haven't invited all of GZ around to try it? I'm gutted!

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#879779 16-Aug-2013 20:36

Wellingtonians, please check this list of earthquake prone buildings for your workplace/apartment. I'm not saying that you should move out tomorrow or even next year, but I think it's important that everyone who works/lives in a recognised and published earthquake prone building should at least be aware. Put your employer/landlord on notice if you aren't happy with your situation

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#879782 16-Aug-2013 20:45

PaulBags: Magnitude only tells you how much energy was released. It's useful, but doesn't tell you how violent the shaking was, how long the shaking went on for, etc.

Being from Christchurch, when I hear the motion was 'rolling', I think either far away and/or not really damaging. I would describe February 2011 as 'coked up epileptic washing machine'. And you can get strange small quakes too, like a mag ~2 aftershock we had centred almost right under our house, it lasted a split second, sounded and felt like one of the piles suddenly rammed the floor; and yet was recorded as unnoticeable. Indeed we probably were the only people to notice it.

@kiwitrc: Wellington is built on pretty solid ground, Christchurch is built on a swamp. Some of those buildings that came down in ChCh CBD were likely sitting on old waterways, would be interesting to see some old water board maps. Oh and the rivers that haven't been dredged for who knows how long, pushing the water table up even before the quakes.

FYI I've done some analysis with the 1856 (roughly when Christchurch was settled) 'black maps' of Christchurch swamps and watercourses, and couldn't find any relationship with EQ damage.
Of course the rivers and their sediment were a big contributor to liquefaction/lateral spreading, but my guess is that a) the path that these rivers meandered over in the past 1000+ years will have been a stronger influence than just the past 150 years, and b) the sediments deposited all over Chch from the Waimak when it came out south of Banks Peninsula will be to blame, and in that case its more an issue of the watertable and the resulting saturation of the Waimak sediments.

I had really hoped for some cool correlations when I embarked on that research!

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PaulBags

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#879806 16-Aug-2013 21:27

nickb800:
PaulBags: Magnitude only tells you how much energy was released. It's useful, but doesn't tell you how violent the shaking was, how long the shaking went on for, etc.

Being from Christchurch, when I hear the motion was 'rolling', I think either far away and/or not really damaging. I would describe February 2011 as 'coked up epileptic washing machine'. And you can get strange small quakes too, like a mag ~2 aftershock we had centred almost right under our house, it lasted a split second, sounded and felt like one of the piles suddenly rammed the floor; and yet was recorded as unnoticeable. Indeed we probably were the only people to notice it.

@kiwitrc: Wellington is built on pretty solid ground, Christchurch is built on a swamp. Some of those buildings that came down in ChCh CBD were likely sitting on old waterways, would be interesting to see some old water board maps. Oh and the rivers that haven't been dredged for who knows how long, pushing the water table up even before the quakes.

FYI I've done some analysis with the 1856 (roughly when Christchurch was settled) 'black maps' of Christchurch swamps and watercourses, and couldn't find any relationship with EQ damage.
Of course the rivers and their sediment were a big contributor to liquefaction/lateral spreading, but my guess is that a) the path that these rivers meandered over in the past 1000+ years will have been a stronger influence than just the past 150 years, and b) the sediments deposited all over Chch from the Waimak when it came out south of Banks Peninsula will be to blame, and in that case its more an issue of the watertable and the resulting saturation of the Waimak sediments.

I had really hoped for some cool correlations when I embarked on that research!

Interesting :).

Shock

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#879812 16-Aug-2013 21:38

No fun was had on Level 11 NZ Post House. It lasted noticeably longer this time but work is a mess. Shook everything around and onto the floor.

Great seeing all the people picking up train commuters and taking them home in their spare seats.

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#879822 16-Aug-2013 22:01

PaulBags: Magnitude only tells you how much energy was released. It's useful, but doesn't tell you how violent the shaking was, how long the shaking went on for, etc.

Being from Christchurch, when I hear the motion was 'rolling', I think either far away and/or not really damaging. I would describe February 2011 as 'coked up epileptic washing machine'. And you can get strange small quakes too, like a mag ~2 aftershock we had centred almost right under our house, it lasted a split second, sounded and felt like one of the piles suddenly rammed the floor; and yet was recorded as unnoticeable. Indeed we probably were the only people to notice it.

@kiwitrc: Wellington is built on pretty solid ground, Christchurch is built on a swamp. Some of those buildings that came down in ChCh CBD were likely sitting on old waterways, would be interesting to see some old water board maps. Oh and the rivers that haven't been dredged for who knows how long, pushing the water table up even before the quakes.

The CBD in Wellington is mostly built of reclaimed land, there are little brass plaques starting from the Parliament end of Lambton Quay going all the way to Cambridge Terrace showing where the original shore line was. The fill used was 'apparently' all the demolition material from the 1855 earthquake. (bricks, stone, mud, gravel, etc)

Everything on the harbour side of Lambton Quay, Willis Street, Manners Street, Courtenay Place is on reclaimed land. the other side is built on the original shoreline, gravel sand, etc...

I would like to know those who decided the best place to build Te Papa was on the water front are now thinking about their decision. It may be built to withstand a 8+ earthquake, but its obvious they didn't even think about any resulting Tsunami. National treasures worth 100's of millions housed in a building on the waterfront.

I wonder what Te Papa's insurance bill was adjusted to after 26/12/2004 and 11/03/2011.

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#879851 16-Aug-2013 22:45

MaxLV:I would like to know those who decided the best place to build Te Papa was on the water front are now thinking about their decision. It may be built to withstand a 8+ earthquake, but its obvious they didn't even think about any resulting Tsunami. National treasures worth 100's of millions housed in a building on the waterfront.

"Museum of New Zealand Te Papa Tongarewa is on Wellington
Harbour, which has been hit by tsunamis in the past and is
at risk from major earthquakes and tsunamis. The building
was designed so that no art or artefacts are displayed or
stored on the ground floor."

I was outside in Strathmore Wgtn smashing a hole in a concrete path to get at some pipes. It felt quite strange to feel the ground push back but there was only a brief shake and not as bad as the last notable one. The following wobbles were only evident by the CRT monitor shaking.

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