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I am trying to determine which on Earth's surface has the lowest gravity. Googling is not finding anything concrete. My natural inclination would be to think of Mount Chimborazo in Ecuador, being on the equator (centripetal force) and also being the furthest point from the Earth's center. However, the GRACE gravity map has the area listed in red for high gravity, presumably due to local mineral anomalies or mantle structure.

Is there any definitive source for information on the topic?

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What is wrong with the color coding of Grace? en.wikipedia.org/wiki/File:Geoids_sm.jpg . Lowest gravity is over oceans, and that is reasonable since the gravitational field depends on the mass below, and the smaller the radius the less mass there, not more as you seem to assume. –  anna v Mar 20 '12 at 11:36
    
The colour coding of GRACE is fine. The lack of an X to mark the lowest point is my question. –  dotancohen Mar 20 '12 at 11:44
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Programmers solution: fetch GRACE data by running scripts on an interactive map. Find lowest point. I'll try this later :) –  Manishearth Mar 20 '12 at 12:01
    
It is the darkest blue, and it is not one point but several, all under water: csr.utexas.edu/grace/gravity –  anna v Mar 20 '12 at 12:05
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Relevant article –  dotancohen Sep 16 '13 at 14:55

3 Answers 3

up vote 2 down vote accepted

Lowest gravity on earth surface is near Sri Lanka based on the articles below.

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Thank you Dimuthu! –  dotancohen Oct 12 '12 at 9:09

According to http://en.wikipedia.org/wiki/Gravity_of_Earth#Comparative_gravities_in_various_cities_around_the_world Mexico City has the lowest gravity of any city. However the article doesn't mention mountain tops.

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Thank you. I did see that, but as you mention it does not pertain to the entire Earth's surface but rather only to the relatively small portions of the Earth's surface which constitute large human population centers. –  dotancohen Mar 20 '12 at 11:30
    
Given the analysis you linked to it's surprising that someone hasn't worked out the answer to your question, but Googling has failed to find it. If someone finds an authoritative answer I'd be very interested to hear it. –  John Rennie Mar 20 '12 at 11:36

Probably Mt. Chimborazo has the MOST gravity, as being in the "fattest" part of the planet and as one of the highest mountains you will have LOTS of mass generating more gravity (remember the more mass, the more gravity).

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But the higher you go up a mountain the farther you are from the rest of the Earth and $1/r^2$ is pretty significant dropoff. Which one wins? More mountain mass or being closer to the surface of the Earth? –  Brandon Enright Nov 26 '13 at 22:22

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