Essay on The Effects Of Magnetic Permeability On The Magnetic Field

Essay on The Effects Of Magnetic Permeability On The Magnetic Field

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Aeromagnetic Data
Theory
Scalar aeromagnetic data reflect both induced and remnant magnetic fields. Induced magnetism is caused by the earth’s magnetic field and is mainly the result of the magnetic susceptibility of the rock. Magnetic susceptibility is expressed as a unit-less proportionality constant denoted by an International System of Units (SI), which simply reflects the susceptibility of a rock to become magnetized in the presence of a magnetic field. This susceptibility is mainly a function of the rock’s magnetite content. In general, higher susceptibility rocks produce greater variability in magnetic amplitudes than low-susceptibility counterparts (Anderson et al., 2013) (Table 2).The remanent component is a function of the magnetic, mechanical, and thermal history of a rock and is not affected by the inducing magnetic field in which it is measured. In most cases, the induced component of the magnetic field is predominant. However, remanent magnetization is commonly dominant in igneous rocks which can result in strong negative polarization and subsequent negative amplitude magnetic lows (Anderson et al., 2013).

Aeromagnetic data is collected at a resolution necessary to satisfy a specific survey objective (regional mapping vs. local mapping). Resolution is a function of flight line spacing and height above ground. High-resolution data comprises closely spaced flight lines near land surface and result in more detailed characterization of causative magnetic sources than data collected at wider flight-line spacing and higher altitudes above land surface. The strength of a magnetic field decreases as a function of the cube of the distance from a causative magnetic source. As a result, shallow sources are represented by sho...


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...signature of the residual magnetic field data, derivate filtered data show that the LLIC in C-C’ has significant internal variability in magnetic susceptibility that could reflect compositional layering. Short wavelength magnetic anomalies above the LLIC could represent small iron formation or pyrrhotite rich layers. The OIS in C-C’ is represented by an oscillatory magnetic pattern that likely reflects internal compositional layering of the mafic sill. The magnetic signature of the OIS varies from 100-250 nT and is sharply bound by negatively polarized rocks. A magnetically subdued interval separated the OIS and an upper lever pyrrhotite or iron-oxide layer. The magnetic layer above the OI reaches amplitude of 250 nT, and is sharply bound to the south by the Vermillion fault which is represented by a sharp magnetic low.
Structural Interpretation of Aeromagnetic Data

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Essay on The Effects Of Magnetic Permeability On The Magnetic Field

- Aeromagnetic Data Theory Scalar aeromagnetic data reflect both induced and remnant magnetic fields. Induced magnetism is caused by the earth’s magnetic field and is mainly the result of the magnetic susceptibility of the rock. Magnetic susceptibility is expressed as a unit-less proportionality constant denoted by an International System of Units (SI), which simply reflects the susceptibility of a rock to become magnetized in the presence of a magnetic field. This susceptibility is mainly a function of the rock’s magnetite content....   [tags: Magnetic field, Magnetism, Igneous rock, Basalt]

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