This function shows area on the globe where there are interference in the Earth ’s charismatic field of battle . Here , red betoken a potent magnetic tower , and blue a weaker one ( white-hot lines are the edges of tectonic plates ) . As you could see , disturbances are fairly regularly distributed , but that does n’t halt UFO enthusiasts from saying aliens have a paw in these magnetic fluctuation . Science , however , has a slightly unlike explanation for why certain objects ( including submarines ) produce a duty period in the charismatic line of business .
According to the Geological Survey of Finland , which create the single-valued function out of years of resume enquiry :
This mathematical function is the first world compiling of the wealth of magnetic anomaly information derived from more than 50 years of aeromagnetic surveys over estate areas , research watercraft magnetometer traverses at ocean , and observation from earth - orbiting satellite , add on by anomaly values derived from oceanic crustal ages . The object lens is to leave an interpretive dimension to surface reflexion of the Earth ’s composition and geologic structure . Metamorphism , lithology , and redox state all have important event on the magnetic attraction of crustal materials .

The magnetic anomaly represented on this mathematical function develop mainly in igneous and metamorphic rocks , in the Earth ’s crust and possibly , uppermost cape . Magnetic anomalies represent an estimate of the short - wavelenght ( < 2600 kilometre ) discipline colligate with these parts of the Earth , after estimate of fields from other generator have been subtract from the measured field magnitude . In most property the magnetic anomaly field is less than 1 per cent of the full magnetic field .
Magnetic Anomaly Map of the World[via Commission for Geological Maps of the earth ]
This io9 flashbackoriginally appear in October 2008 .

https://gizmodo.com/magnetic-anomaly-map-of-the-world-5060911
GeologymagnetismPhysicsScience
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