Marine Magnetic Anomalies

• Main Authors: Copyright David Sandwell, David T. S
• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: North Magnetic Pole
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.24.3068; http://topex.ucsd.edu/geodynamics/04magnetics.pdf

Introduction This lecture is basically the development of the equations needed to compute the scalar magnetic field that would be recorded by a magnetometer towed behind a ship given a magnetic timescale, a spreading rate, and a skewness. A number of assumptions are made to simplify the mathematics. The intent is to first review the origin of natural remnant magnetism (NRM) to illustrate that the magnetized layer is thin compared with its horizontal dimension. Then the relevant differential equations are developed and solved under the ideal case of seafloor spreading at the north magnetic pole. This development highlights the fourier approach to the solution to linear partial differential equations. The same approach will be used to develop the Green's functions for heat flow, flexure, gravity, and elastic dislocation. For a more general development of the geomagnetic solution, see the reference by Parker [1973]. Crustal Magnetization at a Spreading Rid