29-04-2003 23:53									#31
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Florida could just pour into the Gulf like salt out of a shaker with the lid removed - so there is always that hope!

	30-04-2003 00:01									#32
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The R scale isn't a sufficient indicator for the violence of an earthquake. Two earthquakes with the same R scale can be completely different in their violence at the surface.

Do you remember the murderous earthquake of Cairo ? There was an exactly as strong Earthquake in Maastricht shortly after, which was nearly harmless. The different natures of the ground explained why the violences were so different.

My highschool geology teacher explained the difference with this example :
He took one leaf of paper in one hand and punched it with the other. As expected, the leaf of paper feeled the punch dearly, and shook as hell.
He then took a whole pile of paper and punched it with exactly the same strength. The pile of paper hardly shook.

	30-04-2003 02:19									#33
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quote: Originally posted by Lincoln I felt it in middle Tennessee. Kind of rare for this area.

I'm in west Nashville, and I didn't notice it. Of course, I can sleep through pretty much anything.

Other people in the house did feel it, though.

	30-04-2003 03:03									#34
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quote: Originally posted by Jonny I'm in west Nashville, and I didn't notice it. Of course, I can sleep through pretty much anything. Other people in the house did feel it, though.

Vandy?

	30-04-2003 03:09									#35
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edit: wife went to Vandy by the by...


speaking of shake amplification, this pic show why SF is not the best place to be to ride the rollers:

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	30-04-2003 03:18									#36
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quote: Originally posted by Sten Sture edit: wife went to Vandy by the by... speaking of shake amplification, this pic show why SF is not the best place to be to ride the rollers:

Yeah, the areas built on mud will get it hard. My cousins live at the top of a rock hill in Redwood City, so they would be fine.

	30-04-2003 03:36									#37
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Bedrock to the west, landfill to the east - what would you choose??

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	30-04-2003 03:58									#38
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The most potentially damaging part of an earthquake is if the shaking becomes so violent that the ground undergoes “liquefaction”. Liquefaction is where the sediments get shaken so bad that they end up getting suspending in the ground water much the way fat is suspended in a glass of milk. Liquefaction is most likely to occur in a large sediment basin which has a hard rock basement material because this sort of configuration reflects the motion waves back into the effected area the same way a magnifying glass concentrates light.. The energy waves bounce around and reflect off of the hard rock basement and the result is the water in the sediments is shock so violently that the sediments actually get suspended in the water and the ground will flow like a liquid. Because the ground is behaving like a liquid the buildings built on top of the unlithofied sediments will actually partially sink into the ground and/or fall over. Even large skyscrapers and elevated freeways which have been made "earthquake safe" can not be made safe against sever liquefaction.

So is this just academic or is some part of the world actually have geology like this? As a matter of fact the LA basin has exactly this type of geology. Remember that the next time you’re driving down the Hollywood freeway.

	30-04-2003 06:28									#39
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I thought that was you humping GP.

Rock the house yall.


thanks

	30-04-2003 07:10									#40
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The New Madrid Fault has given me a hypothesis that in a few million years North COULD split in half. It could form a full-blown rift valley, like in Africa. There was a show a the Discovery Channel about it a while back, and I have wondered since if it may be the beginnings of a new plate boundary.

	01-05-2003 06:48									#41
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quote: Originally posted by PLATO1003 Vandy?

No, further west, over in Cheatham County.