Geophysical Applications of Earth Rotation Measurements

Statistics – Applications

Scientific paper

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Scientific paper

Measurements of the variations in Earth rotation have improved dramatically over the last few decades. These measurements are usually viewed in three separate ways: (a) The motions of the Earth’s rotation axis with respect to the crust (polar motion); (b) the variations in the rate of rotation (length-of-day, LOD); and (c) motions of the Earth’s rotation axis in space (nutations). VLBI is the only technique available that can make reliable measurements of all of these components over long periods of time. The requirements for such stability are for (a) a stable terrestrial reference frame and for (b) and (c) a stable inertial reference frame with the latter being unique to VLBI. We discuss the relationship between and the accuracy of different space geodetic techniques for making measurements of Earth rotation variations and the geophysical applications of each of the measurement types.

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