Mars Express has released the results of a gravity mapping program, done in conjunction with MRO, looking at volcano formation. There are two pages now on-line:
General Interest:
http://www.esa.int/esaSC/SEM6HJNW91H_index_0.html
Science and Technology pages, with more slightly technical detail:
http://sci.esa.int/science-e/www/object/index.cfm?fobjectid=50299
Is there a global map somewhere? It is edifying to know that there probably is, but it would be neat to see it after reading about it. Perhaps this:
http://ars.els-cdn.com/content/image/1-s2.0-S0019103510003830-gr13.jpg
Interesting that the found evidence to support a mantle plume for those three volcanoes in a line. Wonder if that means the mantle moved, but the crust didn't.
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