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Christchurch NZ Hit With Another Quake

Earthquake Christchurch New Zealand 2011

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#1 Vapor Trails

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Posted 23 December 2011 - 08:38 AM

Didn't post this yesterday-TOO INSANELY busy.  :wacko:

New Zealand Herald

Quote

Christchurch residents are being warned to brace themselves for more aftershocks tonight and into the Christmas holiday period.

The latest round of earthquakes began at 1.58pm this afternoon, measuring 5.8 magnitude with a focal depth of 10 kilometres. Its epicentre was 20km east of Christchurch, according to the GNS website.

It was reported as "slightly damaging'' in the Christchurch suburb of Hornby and was reported by 27 homes and businesses on the online GNS shaking map.

The next quake struck eight minutes later, measuring 4.2 with an epicentre 20km east of Lyttelton.

A little over an hour later, at 3.18pm, Christchurch residents were rocked by a quake of magnitude 6.0, centred 10km east of the garden city at a focal depth of six kilometres.

More of the article is at the link. Those poor folks. :(  :headshake:

Edited by Vapor Trails, 23 December 2011 - 08:39 AM.

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#2 Tricia

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Posted 23 December 2011 - 09:56 AM

I don't know what the history was there as far as earthquakes prior to this or the September 2010 quake but this seems to be a pretty active fault now.

Just glad there are only minor injuries reported this time.

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#3 Vapor Trails

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Posted 23 December 2011 - 02:48 PM

Well, New Zealand is in the Pacific Ring of Fire, I'm sorry to say. :(
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Politicians are like bananas; they hang together, they're all yellow, and there's not a straight one among them.

"We're relevant for $ and a vote once every two years. Beyond that, we're completely irrelevant, except of course to consume, and preach the gospel according to [insert political demigod here]."--Cait

#4 Peridot

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Posted 23 December 2011 - 11:20 PM

View PostTricia, on 23 December 2011 - 09:56 AM, said:

I don't know what the history was there as far as earthquakes prior to this or the September 2010 quake but this seems to be a pretty active fault now.

Just glad there are only minor injuries reported this time.


View PostVapor Trails, on 23 December 2011 - 02:48 PM, said:

Well, New Zealand is in the Pacific Ring of Fire, I'm sorry to say. :(

Part of the problem is that Christchurch is sitting right on top of a fault...and this was not known until recently; if I understand correctly, it was only discovered in the aftermath of the 2010 quake.

That info is from a Feb 2011 article on the earlier quake from The Guardian.

Just in case anyone wonders what the term "liquefaction" means--it's referred to briefly in the article from the New Zealand Herald that Vapor Trails gave the link for---the earlier article also has a pretty clear explanation for the layperson.

Quote

John Clague, an expert in natural hazards at Simon Fraser University in British Columbia, said it was unclear what caused such serious damage to modern buildings, but said the answer could be the "liquefaction" of the ground when the shaking began.

"Liquefaction is a huge problem in Christchurch because the city is built on an alluvial plain, on sediments that are vulnerable to liquefaction," Clague said. "When shaken, these sediments transform into a liquid, causing irregular settlement of the ground, which is extremely damaging to buildings and buried structures, like water lines."

So yes...those poor folks. An historic and I understand beautiful city, more vulnerable than anyone had dreamed. :(

Peridot
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