Re: Aceh: can plates be broken ? or can they stretch and bend ?
From: Rod Burns (morrainx_at_hotmail.com)
Date: 01/28/05
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Date: Thu, 27 Jan 2005 20:05:47 -0500
"Daryl Krupa" <icycalmca@yahoo.com> escribió en el mensaje
news:1106803698.102583.116050@c13g2000cwb.googlegroups.com...
Rod Burns wrote:
> "Daryl Krupa" <icycalmca@yahoo.com> escribió en el mensaje
> news:1106733670.781330.101100@c13g2000cwb.googlegroups.com...
<snip>
> > Between Sumatra and the Sunda Trench a "sliver plate" has
> > developed;
>
> Do we know when it has developped ?
More than 5 million years ago.
> is it geologic or prehistoric times ?
I'm not sure what you mean by "geologic", but certainly in
prehistoric times, yes.
=> prehistoric = more recent than the oldest human fossile
=> geologic = before that
<snip>
> > The Indo-Australian PLate will continue to dive under Indonesia,
> > but the strip SW of Sumatra (and the western half of Sumatra)
> > will be dragged NW by its oblique convergence.
> > Other than that, Indonesia is more likely to be piled up
> > into a mountain range (like Papua-New Guinea, e.g.) than to be
> > split apart.
>
> Yes, I agree. I meant chipped into pieces = chipped into
> many small plates piling up one against the other
> when squeezed by the India-Australia plates,
> so in the end building up another Himalayas
Maybe. Maybe more like Southern Europe or the Middle East,
which are also the result of collisions of several microplates
with the southern edge of Eurasia.
<snip>
> > Here's a useful site, with the reason why the "plate boundaries"
> > on the maps you mentioned are not plate boundaries:
> >
> > http://www.geocities.com/tiggernut24/earthquake.html
> >
>
> Thank you, it is still complex, but it is much coherent.
> I'll dig it up.
> My understanding now is that there is no other place on Earth
> where did occur so many worldwide catastrophic eruptions in
> prehistoric times, the Antiquity, or recent history and modern
> times; the latest ones being in 1816 and 1883 (still counting...).
> One explanation is that the forces in action here
> are so important that it creates
> specific transient sliver plates.
That's a good term. I think I'll borrow it. May I?
=> please do
> The dynamics are so quick and complex that it is even
> necessary to invent new analytical abstract lines
> to help the understanding.
If by that you mean that creative thinking is
necessary to understand a unique area, then I agree.
It's just too bad that Peter Bird's experimental concept
was portrayed as accepted truth, in the haste to
get geological information out to the wider Universe.
=> I agree that with creation science hanging around, it's better to be
didactical
=> What I mean is that if a specific analytical tool was developped to
understand this area, and if this tool is actually meaningful, then this
shows how this area is specific, and how it should be "handled with care".
<snip>
> > I.e., the red line dividing the Indian Plate from the
> > Australian Plate (and the E-W line thru Thailand,
> > for that matter) do not exist in nature.
I can re-excavate more specific information, if you like.
Feel free to contact me via e-mail.
Daryl Krupa
=> Thank you. Actually, I've got a less scientific and more practical
question about prevention.
=> Is there a coordinated system, specific to this sumatra region, to
predict catastrophic eruptions ?
It seems to me that in a world scale of global dangers, with anything from
avian flu to global warming and asteroid impacts, the volcanoes in these
specific region do not look ridiculous at all. They seem much more dangerous
than the tsunamis, which I consider were not monitored for political reasons
(lack of political decisions). There was no technical difficulty about that.
Just no will.
Now, if we - well, rather you, geologists - are aware of a sequence of
eruptions, every two or six or so hundred years on average, in this sumatra
area, that caused year-long worldwide meteorological disruptions (not to
speak of the local destructions), then if you know this and can be
convincing with it, then I think the timing is about perfect to group a task
force, assess risks with fellow meteorologists, and ask governments what
they would like to do about it. Global warming has been dealt with when it
was still considered as a remote centenial issue. How would you feel if in
2007 the whole area hit by the tsunamis were covered with 10 to 30 cm ashes
?
I'm not sure whether anything can be done to predict and/or prevent/control
a toba or krakatau eruption, but maybe it is time to start thinking about
it. You know, as a start, it will take two years to have local and global
politicians to agree on anything, etc.
Rod Burns
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