Free-air gravity anomaly from Earth Gravitational Model EGM2008. The gravity anomaly is the difference between the measured gravity and the normal gravity. The difference is given in the unit milligal (mGal) equal to 10-5 m/s2.
Map made with Generic Mapping Tools (GMT) from the EGM2008 data file http://earth-info.nga.mil/GandG/wgs84/gravitymod/egm2008/Anomaly_DOV/Dg01_mean5.0x5.0_EGM08_to2190_WGS84_ell_nh.
Own work
Cavit