0301temp_WorkOfPlates-stu - Theworkoftheplates...

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The mountains are no more fixed than the stars. Annie Dillard The work of the plates EARTH SCIENCE in ARIZONA and the SOUTHWEST
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2 The work of the plates What causes volcanism and tectonism? What accounts for different thicknesses of the crust? What builds continents and mountain belts?
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3 The work of the plates Deformation of the crust is evidence that the solid Earth is mobile Is it still moving? Earthquakes ! Basin and Range Colorado Plateau Transition Zone Río Grande Rift Southern Rocky Mountains
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4 The work of the plates We can measure displacements of the crust (even a few mm per year) with the Global Positioning System Is terra firma still moving? GPS receiver in Canyon de Chelly GPS receiver in Canyon de Chelly 20,200 km orbit (geosynchronous)
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5 The work of the plates Sella, Dixon, and Mao, 2002 / UNAVCO archive Sella, Dixon, and Mao, 2002 / UNAVCO archive GPS measurements in real time show a continuing global pattern of movement. Slower Faster
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6 The work of the plates Theory of plate tectonics J. Vigil, USGS
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7 The work of the plates Earth is layered by strength as well as by composition. The rigid lithosphere rides on the ductile asthenosphere . The theory of plate tectonics: Lithosphere and asthenosphere Lithosphere Lithosphere Asthenosphere Asthenosphere Tasa Tasa Crust Upper mantle
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8 The work of the plates Compare the distribution of earthquakes (yellow), volcanoes volcanoes (orange), (orange), and high elevations (brown) and high elevations (brown) Volcanism, deformation, EQs, mountain building mountain building = tectonic activity tectonic activity Belts of tectonic Belts of tectonic activity divide activity divide lithosphere into lithosphere into tectonic plates tectonic plates Reynolds, Johnson, Kelly, Morin & Carter, 2008
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9 The work of the plates Mosaic of rigid tectonic plates
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