Earth Magnetic Anomaly Map
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Earth Magnetic Anomaly Map
Magnetic anomaly maps provide insight into the subsurface structure. Comments ( 23) click to view this map shows areas on the globe where there are disturbances in the earth's magnetic field. And composition of the earth's crust.
Contour maps were created for each of the seven magnetic elements (d, i, h, x, y, z, and f) and for their secular variation (rate of change). Magnetic anomalies result from geologic features enhancing or depressing the local magnetic field. Magnetic anomaly maps derived from regional airborne (magnetic methods, airborne) and marine surveys are beneficial to our understanding of the subsurface structure, chemical composition, and geodynamics of the earth’s crust (continental crustal.
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Airborne measurement of the earth's magnetic field over all of north america provides gridded data describing the magnetic anomaly caused by variations in earth materials and structure. Magnetic data have been collected from magnetometers towed by aircraft and ships for many decades now. Anomalies trending parallel to the isochrons (lines of equal age) in the oceans reveal the temporal evolution of oceanic crust. Contour maps were created for each of the seven magnetic elements (d, i, h, x, y, z, and f) and for their secular variation (rate of change).
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