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Earth and Space Sciences · পরিভাষা
Euler pole; Euler vector কী?
অন্য নাম: Euler pole · Euler vector
Definition 12.3University Earth and Space Sciences — Year 1 · অধ্যায় 12 — Plate Kinematics on a Sphere
The motion of a plate B relative to a plate A is a rotation about an axis through the centre of the Earth. The Euler pole of the pair is the point where this axis meets the surface, chosen so that the rotation is anticlockwise seen from above it; the antipodal point is the opposite pole. The Euler vectorωBA is the angular velocity of B relative to A: it points from the centre of the Earth towards the Euler pole, and its length ω is the rate of rotation.
উদাহরণ
Example 12.8(Eurasia moves away from North America in Iceland)
Take the middle of Iceland at 64.5∘ N, 18∘ W, and the Euler vector of Eurasia relative to North America above. Then ωR=3.665×10−9×6.371×109mm=23.35mmyr−1, and
so Δ=52.60∘ and v=23.35sin52.60∘=18.55mmyr−1. The pole is seen at the azimuthβ=13.1∘, a little east of north, over the Arctic; Eurasia moves towards 103.1∘, east-south-east, that is 18.07mmyr−1 to the east and 4.20mmyr−1 to the south.