Showing posts with label earth. Show all posts
Showing posts with label earth. Show all posts

Monday, April 1, 2013

The Geoid

I've been thinking about Earth. Typically we think of the Earth as being a perfect sphere as represented by those silly globes from grade school. In reality, due to concentrations of magma, mountains and deep sea trenches, the Earth is anything but a perfect sphere. Not only does this distort our concept of a perfectly spherical planet, but it also distorts the Earth's gravitational field, causing regional anomalies.

Visualization helps. Here are a few images of the Earth's gravitational anomalies in relief:

gravitational anomalies josh wieder

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