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Gravity Map of Earth

Posted by michael on from the light-reading dept.

dr3vil writes "Interesting results have been published by the GRACE (Gravity Recovery and Climate Experiment) project, of the various gravity anomolies that exist at various places on Earth. The BBC report gives a good overview. Fascinating for me, a resident of California, to see us apparently sandwiched between a high and a low spot. Maybe that helps aids the tectonic flows around here?"

2 of 72 comments (clear)

  1. mGal by molo · · Score: 4, Interesting

    BTW, if you want to know how much gravity differs (and how damn sensitive these sats are), look at this chart:

    http://www.csr.utexas.edu/grace/gallery/gravity/ 03 _07_GRACE.html

    And note the range of the legend -60 to +60 mGal.

    Because variations in gravity are very small, units for gravity surveys are generally
    in milligals (mgal) where 1 mgal is one thousandth of 1cm/s

    Thats damn sensitive.

    -molo

    --
    Using your sig line to advertise for friends is lame.
  2. Re:Sub dectection by BigBir3d · · Score: 4, Interesting

    If the sub is moving, their is a layer of compressed water on one side, and a layer of slightly less compressed water on the other side (kind of like how radar sees a moving volume). Not to mention any bubbles generated by the spinning prop(s) out back decreasing the density of the water significantly. Question is; can we detect it fast enough to matter? Knowing where a sub was 30min ago is useless.

    IIRC, magnetic harmony has already been reached between sub and ocean. I think that was something they did back in the 50's or 60's. Not 100% on that though...