[time-nuts] Freestanding mast
sar10538 at gmail.com
Tue Sep 7 10:49:56 UTC 2010
I've seen news coverage of that field in Darfield and it's just like a
giant has torn each end of the field apart with half of it going one
way and the other end going in the opposite direction.
There are still new cracks and crevasses opening up each day as the
magnitude of the after-shocks are reaching 5.4 on a daily basis. A
geologist said that it's generally the case that the highest
after-shock will be 1 unit below the peak so we should be prepared for
a 6.1 at some time soon.
The only good thing about this is that the Earth hasn't moved so much
for me in ages :)
Cheers from Quake City (it used to be called The Garden City but they
have renamed it now),
On 7 September 2010 20:19, Hal Murray <hmurray at megapathdsl.net> wrote:
> sar10538 at gmail.com said:
>> The mast could have sunk a bit or even this whole area could have done as I
>> live on reclaimed marsh-land. My Mothers 3 year old house looks like it has
>> sunk a bit at one and and risen at the other, ie. it looks like it has
>> tipped slightly as her house is built on a concrete pontoon.
> It's not off scale to move a meter vertically, but I can't find anything that
> makes me think it's likely in this case.
> If something like that happened due to construction on a marsh, I'd expect
> there would be a lot of disruption on the local surface, that is the local
> vertical displacement would not be uniform. But you wouldn't see that if a
> large corner of a plate moved up or down.
> If there was a large vertical displacement, we should be able to find
> something in a news report, or maybe some better info will appear in a week
> or month after the local geology geeks have collected more data and analyzed
> it carefully.
> (The data from the Chile quake was very very good, but they had a major data
> gathering setup in exactly the right spot.)
> This news story at:
> says 11 feet horizontal and
> Roger Bates, whose dairy farm at Darfield was close to the quake's
> epicentre 19 miles west of Christchurch, said the new faultline had ripped up
> the surface across his land. `The whole dairy farm is like the sea now, with
> real soil waves right across the dairy farm.
> `We don't have physical holes (but) where the fault goes through it's been
> raised a metre or metre and a half.'
> Another URL:
> The biggest NZ earthquake - magnitude 8.2 Wairarapa earthquake in 1855.
> On an international scale, the 1855 earthquake is of major significance in
> terms of the area affected and the amount of fault movement. About 5000km2 of
> land was shifted vertically during the quake. The maximum uplift was 6.4m
> near Turakirae Head, east of Wellington. The maximum horizontal movement
> along the fault was about 18m. This is the largest displacement along a
> vertical fault line ever recorded!
> Ahh... Here is a URL that says "variable vertical movement of up to 1 m"
> Time sink warning, there are good links on that page. In particular, lots of
> good pictures here:
> For the 1989 Loma Prieta (San Francisco) quake, the local photographers
> donated lots of good pictures and they made a couple of picture books.
> Profits went to the needy.
> These are my opinions, not necessarily my employer's. I hate spam.
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Steve Rooke - ZL3TUV & G8KVD
The only reason for time is so that everything doesn't happen at once.
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