How do scientists detect tectonic plate motions?
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On a bigger scale, some heat anomalies in the mantle are used as reference"points". You can also compare the relative motion between plates (without fixed reference point, you will only have relative motion). read more
Scientists now have a fairly good understanding of how the plates move and how such movements relate to earthquake activity. Most movement occurs along narrow zones between plates where the results of plate-tectonic forces are most evident. read more
Source: pubs.usgs.gov
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Further Research
GPS—Measuring Plate Motion
www.iris.edu
How Do Seismologists Measure Motion in Plate Tectonics?
www.thoughtco.com
Measuring plate motion with geodesy
www.e-education.psu.edu
Understanding plate motions [This Dynamic Earth, USGS]
pubs.usgs.gov
