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tehgerbil

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#191730 14-Feb-2016 13:25
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Hope all Christchurch geekzoners are ok! 


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kingjj
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  #1492040 14-Feb-2016 13:28
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Kia Kaha. Nothing broken here, few things fell over, TV (and by extension the Cricket) survived without a blip. 

 

 

 

I have to apologise, everytime there's a big quake in Chch I'm in my PJ's watching TV. MY bad guys.




Fred99
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  #1492043 14-Feb-2016 13:33
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Yup - that's what a real quake feels like - I'd almost forgotten.
Or 5 kilo tonnes TNT letting rip 7km from where I'm sitting.

 

Quick walk around the house - no damage.  A couple of things fell off shelves.

 

 

 

ETA a lot of sirens going around here - not sure if it's related to quake.

 

Hope this doesn't "re-energise" the system too much - life with only occasional aftershocks was seeming to be normal again.


CruciasNZ
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  #1492044 14-Feb-2016 13:35
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I have friends in New Brighton (~km east of CHCH, quake was ~15km east of CHCH) who are saying it buggered up all the roads again. oO

 

EDIT: GZ doesn't like my chosen vocabulary

 

http://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=11589469

 


Some photos of dust over CHCH from cliff falls





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Fred99
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  #1492045 14-Feb-2016 13:37
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CruciasNZ:
Some photos of dust over CHCH from cliff falls

 

 

 

 

That doesn't look good - probably explains the sirens I'm hearing - on road to Sumner.


  #1492047 14-Feb-2016 13:40
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That was a doozy, biggest in a long time. Another section of whitewash head came down, big dust clouds.

 

https://twitter.com/SumnerBoy/status/698665394224001024

 

I am in the middle of Sumner and we had a few things fall off shelves but nothing broken (as far I can see).


Fred99
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  #1492049 14-Feb-2016 13:42
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Geonet has downgraded it to M5.7.

 

Small aftershock just as I'm typing this.


  #1492078 14-Feb-2016 14:14
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 Really big rolling thunder type quake that one. Few things fell of shelves nothing to bad though. Lots of alarms going off. Bought back some bad memories, hope everybody else around town is ok. No liquefaction here which i am really happy with.





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TwoSeven
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  #1492080 14-Feb-2016 14:20
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Where I am the house gave the feeling that it was going around in circles - it was interesting because it went on longer than the usual jolts, but other than minor things falling of shelves, all seems to be ok.

 

I guess I better check the quake kit just in case.





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  #1492081 14-Feb-2016 14:21
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This is what my security cam caught , was enough to move the camera around.

 

 

 





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Fred99
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  #1492089 14-Feb-2016 14:54
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Here's spectral acceleration strong-motion data comparison for the quake today with Feb 22 2011, from GNS:

 

 

Note that "period" is shaking frequency - not duration of shaking.

 

About 0.2g. Was offshore a bit - fortunately.  The plot on the chart above for the Feb 22 quake, the epicentre was close enough to being right under the strong motion detector (and my house - darn it).

 

 


msukiwi
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  #1492115 14-Feb-2016 16:10
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I think I am one of the few left with a "Quake Detector" still feeding the Quake Catcher Network at Caltech University.

 

(Caltech took over from Stanford)

 

The QCN Project has run out of funding, so is in the process of a slow death.

 

I purchased my own sensors over 5 years ago and they are fixed under the house to the foundation.

 

1 to feed for Caltech, 1 for me to view.

 

5 years ago there were over 200 people participating here in Christchurch.

 

(Most were part of a Geonet initiative)

 

We can tell by the X/Y/Z where the quake came from:

 

Lots of Z (up/down) = New Brighton

 

Lots of X/Y = Rolleston


  #1492129 14-Feb-2016 16:54
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I was only just reading about this today which is interesting.

 

http://www.engadget.com/2016/02/12/earthquake-detecting-android-app/

 

 

 

 





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surfisup1000
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  #1492139 14-Feb-2016 17:41
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5.7 -- doesn't sound that big but everyone is saying it was really big.

 

I guess quakes of similar reported strengths can have different effects at the ground level -- depending on depth and underlying geology. 

 

The immediate questions will be around that school they were trying to close underneath some cliffs near sumner... and , in general, buildings on and below the cliff. Look pretty dangerous to my untrained eye. 

 

 

 

 


Fred99
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  #1492145 14-Feb-2016 17:57
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surfisup1000:

 

5.7 -- doesn't sound that big but everyone is saying it was really big.

 

I guess quakes of similar reported strengths can have different effects at the ground level -- depending on depth and underlying geology. 

 

The immediate questions will be around that school they were trying to close underneath some cliffs near sumner... and , in general, buildings on and below the cliff. Look pretty dangerous to my untrained eye. 

 

 

 

 

The school (Redcliffs) is well forward of the cliffs.  The Feb 2011 ground shaking intensity was 5-10x stronger than the shake today - yet here was no rockfall in the school grounds.

 

The school is being closed for reasons other than EQ risk - that's just an excuse.  The same government closing down the school will have no problems allowing the land to be sold for housing development etc.

 

Problem is threshold of risk. If you were an engineer who had to sign off to say that in your opinion there was no risk, you'd likely hesitate, in the same way that you might be reluctant to say that central Auckland won't be blown sky high by a volcano.


JWR

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  #1492157 14-Feb-2016 18:28

Fred99:

 

surfisup1000:

 

5.7 -- doesn't sound that big but everyone is saying it was really big.

 

I guess quakes of similar reported strengths can have different effects at the ground level -- depending on depth and underlying geology. 

 

The immediate questions will be around that school they were trying to close underneath some cliffs near sumner... and , in general, buildings on and below the cliff. Look pretty dangerous to my untrained eye. 

 

 

 

 

The school (Redcliffs) is well forward of the cliffs.  The Feb 2011 ground shaking intensity was 5-10x stronger than the shake today - yet here was no rockfall in the school grounds.

 

The school is being closed for reasons other than EQ risk - that's just an excuse.  The same government closing down the school will have no problems allowing the land to be sold for housing development etc.

 

Problem is threshold of risk. If you were an engineer who had to sign off to say that in your opinion there was no risk, you'd likely hesitate, in the same way that you might be reluctant to say that central Auckland won't be blown sky high by a volcano.

 

 

Been a few more minor shocks too.

 

Bit of a shake just now.


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