by Billzfan23 95 Replies latest jw friends
"Last days indeed! Here in CO this morning we had the largest earthquake in 40 years. ..."
MagWitch??? Where the heck in Colorado? Cuz I'm in north Denver and I didn't feel a thing...
Oh, and you WUSSIES!! Hollering about a mere 6.0... You shoulda felt some of the quakes they have in CALIFORNIA...!!
"It's not just because the building codes don't mandate taking quakes into account, but also because of the underlying bedrock. It is extremely hard and a major quake would cause it to shatter. So the damage would be extensive and massive. ..."
Waitasec...
That is exactly the opposite of nearly everything I've ever read about earthquakes...
The worst damage occurs when buildings have been build on sandy soil and/or landfill, ESPECIALLY where the water table is high.
Solid ground, like the highlands in the San Francisco area that weren't as badly shaken in the 1906 quake, usually sustains LESS damage. It's the LIQUIFACTION that causes major damage - LIQUIFACTION basically causes sandy/landfill areas with high water tables to act somewhat like QUICKSAND...
Now, if you're talking about a "locked" fault, that "unzips" along a great length, yes, that is a major factor in the force and amount of damage in a quake, but the type of underlying bedrock isn't quite as much of a factor in that.
One can have a violent "unzipping" of a fault, whether it's in sandstone or granite...
Then of course, it also depends on the depth of the epicenter, and other factors...
Here's a liquefaction map of the San Franciso area...
http://earthquake.usgs.gov/regional/nca/qmap/
Here's a site with pdfs of fairly simple views of earthquake hazards in the continental U.S. and Alaska, Hawaii, and Puerto Rico...
http://earthquake.usgs.gov/hazards/products/
And I'm off to see if I can find a liquefaction map/maps for the east coast...
Cool! I found a liquefaction pdf for Boston...
http://earthquake.usgs.gov/research/external/reports/02HQGR0040.pdf
But I'm having some trouble finding one for Washington D.C. ...
I suspect that Washington D.C. would be EXTREMELY susceptible to liquefaction, since so much of it is built upon former swamp land and river plains...
Hither, I wish to give you an active demonstration of liquefaction.
Ooooh, brother...
Who let the monkey in???
Monkey, I am going to go bug you on your "Who hasn't sent Shamus a PM?" thread...
Well, turned out the commute was far easier than I expected, though a little more crowded than I'm used to because I left earlier. All is well at home, and I even managed to fix the computer. I couldn't ask for more! Seriously, no more...I'm done with earthquakes.
Goooooooooooooooooooooooood night!
--sd-7
Oh, and sorry for not writing you, Jamie--I was distracted once I got home, and a little obsessed with trying to fix the computer. Let's hope nothing screws it up again. I hope I can print stuff at home once more. Maybe I can scan something I'd been meaning to send you quite soon. We'll see.....
--sd-7
Glad you're home safe and sound, SD-7...
I just got to page 2... Depth 1/10th of a mile??? To 2 miles??? That's a shallow bugger...
Here's a pdf on earthquake hazards in selected areas of Arkansas, Kentucky and Missouri...
http://earthquake.usgs.gov/research/external/reports/01HQGR0195.pdf
