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| | Department of Geological Sciences, WCAS, Northwestern University |
 | | Seth Stein, postdoctoral fellow Giovanni Sella, students, and coworkers are engaged in efforts to understand how global plate motions over geologic time (millions of years) compare with those over a few years measured from space geodesy, and exploring these data's implications for the evolution of the continents. |
 | | Before this, geologists could only study the motion of the great plates of Earth's lithosphere (which move at speeds of a few inches per year, about the speed fingernails grow) over periods of millions of years, long enough for large motions to accumulate. |
 | | The profile extends from the stable interior of the oceanic Nazca plate, across the Peru-Chile trench to the coastal forearc, across the high Altiplano and foreland thrust belt, and into the stable interior of the South American continent. |
| www.earth.northwestern.edu /research/area9.html (690 words) |
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