1 Studies of seismic excitation of the polar motion The earth’s rotation varies slightly with time. The 3-D earth rotation variation canbe conveniently separated into two components: i) the 1-D variation in the spin ...1 Studies of seismic excitation of the polar motion The earth’s rotation varies slightly with time. The 3-D earth rotation variation canbe conveniently separated into two components: i) the 1-D variation in the spin rate, oftenexpressed in terms of the length-of-day variation, ii) the 2-D variation in the rotational axisorientation, known as the polar motion as seen in the terrestrial referenee frame.展开更多
文摘1 Studies of seismic excitation of the polar motion The earth’s rotation varies slightly with time. The 3-D earth rotation variation canbe conveniently separated into two components: i) the 1-D variation in the spin rate, oftenexpressed in terms of the length-of-day variation, ii) the 2-D variation in the rotational axisorientation, known as the polar motion as seen in the terrestrial referenee frame.
