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How does the International Terrestrial Reference frame related to the Earth-centered, Earth-fixed frame, as both of them rotate with the Earth?

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The simple explanation: The International Terrestrial Reference (ITR) Frame is an Earth-centered, Earth-fixed (ECEF) frame, but with the axes of the ITR frame precisely specified taking into consideration the movements of the Earth's crust due to plate tectonics.

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  • $\begingroup$ İ know that it considers the tectonic movements, but does it make the ITR different from ECEF? If no, then ECEF also considers tectonic movements? $\endgroup$ – Tarlan Mammadzada Mar 15 '18 at 15:47
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    $\begingroup$ @TarlanMammadzada - There is no such thing as the ECEF. The ITRF is an ECEF. $\endgroup$ – David Hammen Mar 15 '18 at 15:52

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