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Subject 1: (Interview). Subtitle: Robert B. Smith. Timecode In: 00:00:05. Timecode out: 00:29:21. Notes: Yellowstone geology. Subject 2: (Environmental Recording). Subtitle: Wyoming ambi. Timecode In: 00:31:15. Timecode out: 00:33:55. Subject 3: (Environmental Recording). Subtitle: Strong wind. Timecode In: 00:33:25. Timecode out: 00:33:55. Equipment Notes: Stereo=1; Decoded MS stereo. NPR/NGS RADIO EXPEDITIONS Yellowstone DAT #5 BS = Robert B. Smith AC = Alex Chadwick MS = Michael Schweppe ms ms, Sunday :45 bs these are some mathematical models of how we let the n American plate move across ... \. ac and bs talking 2:48 bs bob smith, prof of physics, U of Utah. name of book? 2:55 bs "wind of honors?", geology of the Yellowstone teton system. and its not a conventional bk...relates more to the processes that are happening and how things form. doesn't have boring maps in it...point I'm making is that Yellowstone is a lie, you know in one of my careers I can see things change ... ac and so the whole plate that Yellowstone is on it went up? bs yes, they went up bc of the hot spot this little feature I'm talking about is kind of a little pimple sitting goes up and down that's the Yellowstone plateau that's where the magma finally leaks through to the surface and creates shallow magma systems so there's (paper rustling) a series of shallow magma systems that are clear at a depth maybe ten km. but the real source of it is clear down over here paper rustling 4:54 ac just how would you describe Yellowstone in terms of how unusual a place it is in the world and in your area 5:03 bs well its the biggest sys in the world but the geysers are just the final product of the amt of heat coming through and the amt of heat that drives Yellowstone is about 30 to 40 times the average continental heat flux and that heat is what's driving, heat comes from a combo of magma and you see nothing in this scale anywhere in the world, now the comparable features are HI and Iceland in terms of geographic area, Yellowstone has a cauldron? of 75 km wide and ____ is what 2-3 km wide? but this s a diff system you are cooking a cont plate whereas hi and Iceland are on oceanic plates and they're very thin and they're very clean this plate's been around for 2.8 billion yrs so you're having to bum the candle through rocks that are 2.8 bill yrs own whereas in the pacific you're burning rocks that are 20 million yrs old. 6:06 6:07 ac you talk about this magma which is a pool of molten rock, a very hot place 6:16 bs well people like to think that magma are chambers where you can take you're boat down in to row around and that isn't true , they're like a sponge in the magma only obtains maybe ten-twenty % of total volume so its like a sponge where the sponge mat would be the hard rock and intermixed with pores would be magma but the magma are 1200 degrees (centigrade) 7:22 ac well why is it that's happening under Yellowstone that's not happening under anywhere else in the country and indeed the world? 7:38 bs well you've got magma that's coming up from a source in the upper mantle which we call a hotspot.. .that originates at depths of fifty miles and goes down maybe 200 miles and so there is magma coming out in partial melt form and in the crust that is a depth of maybe 5-8 miles then you create smaller chambers of this magma ... and then every once in a while it burps through and creates these gigantic eruptions and the last one was 600,000 yrs ago ... released 100 cubic km of material came out of the ground, these are catastrophic explosions they sent material in the atmosphere prob circle the globe for tens of yrs covered 20 of the western states with ash so the amt of energy going into these things is enormous, we've never seen this type of what we call rhyolitic eruptions in... (Notes truncated)
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- 7 Oct 2008 - Ben Brotman
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