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tuolumne_tradster
Trad climber
Leading Edge of North American Plate
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Nov 14, 2014 - 07:43pm PT
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RP3: Figure 3 in the article is a map showing distribution of tabular fracture cluster density. That map is based on the Riley and Tikoff, 2010 paper which has data on fracture spacing, orientation, etc.
Judging from the photo shown in Fig 7a, dude looks like he could be a climber. Hard to find a better place than Tuolumne to do field work on granite fractures.
http://www.sciencedirect.com/science/article/pii/S0191814110001628
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Ghost
climber
A long way from where I started
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Nov 14, 2014 - 07:51pm PT
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You want granite? Okay, here's granite.
The smaller chunk on the left is about one-third again bigger than El Cap. The bigger one is about 7.000 ft from base to summit.
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Darwin
Trad climber
Seattle, WA
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Nov 14, 2014 - 09:16pm PT
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Ghost; ^ Himalayas? When?
What a good thread topic, Ed!.
All below are West Coast of NA or central AK, and don't even include Squamish.
up close on one of the middle faces.
These last three are the same place, but I couldn't control myself.
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RP3
Big Wall climber
Twain Harte
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Nov 14, 2014 - 10:07pm PT
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My issue with figure 3 is that it is not quantitative. What is "high density" and what is "low density"? How were these categories arrived at quantitatively? I guess I need to look at the Riley and Tickoff paper.
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tuolumne_tradster
Trad climber
Leading Edge of North American Plate
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Nov 14, 2014 - 10:13pm PT
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RP3: yes, I can email you a copy of that paper.
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RP3
Big Wall climber
Twain Harte
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Nov 14, 2014 - 10:14pm PT
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Thanks, TT. I am psyched to see it. I saw one of their research group give a talk at GSA this year and it was similarly vague.
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tuolumne_tradster
Trad climber
Leading Edge of North American Plate
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Nov 14, 2014 - 10:45pm PT
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RP3: They define TFCs as having a fracture density > 4 fractures per 10 cm in Cathedral Peak granodiorite. This is an arbitrary field description that they came up with. They define Low TFC density as 2 to 5 meter TFC spacing; high TFC density < 2 meter spacing. I sent my email address via the ST tool. Send me an email to that address and I'll send you the paper.
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