Can anyone help me understand this aeromagnetic map?

[Astrobouncer]

I am guessing the deeper the blue the better as that seems to be where the fault lines in my state are located? However I am not sure of this. Can anyone make sense of this map?

http://tin.er.usgs.gov/catalog/cite-view.php?cite=47

 

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[Eu_citzen]

In Sweden red means more magnetic, blue less magnetic. Very good if your looking for Magnetite ores or pyrrhotite.
Fault lines do not show in a magnetic map!!