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...
... middle of paper ...
...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
Need Writing Help?
Get feedback on grammar, clarity, concision and logic instantly.Check your paper »
- 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]
1544 words (4.4 pages)
- An oscillatory hydrodynamic flow through porous medium bounded by two horizontal parallel porous plates in the presence of transverse magnetic field is investigated. Both the stationary plates are subjected to the same constant injection / suction velocities ( V ). A closed form analytical solution is obtained and the affects of different parameters (Injection / suction Parameter, Darcy number, Hartmann number, Frequency of oscillations etc.) on velocity field and skin-friction are discussed with the help of graphs in details.... [tags: Physics, Technology]
1475 words (4.2 pages)
- It’s the magnetic field that extends from the earth’s interior to where it meets the solaria stream of charged particles emanating from the sun. The magnetic field resembles the field of a large bar magnet near its center or that due to a uniformly magnetized sphere. Its origin is thought to be generated deep down in the earth’s core. At the surface of the earth, the pole of this equivalent bar magnet, nearest the north geographical pole is actually a south” magnetic pole. This paradoxical situation exists since by convention a north seeking end of a compass needle is defined as pointing north yet must point to a pole of opposite sense or South Pole of the earth’s magnetic field.... [tags: solaria stream, magnetic storms]
1754 words (5 pages)
- Introduction: Magnetism was not studied or utilized before 1821 as it is today. A few hundred years ago people understood how magnets worked, but didn’t have many applications of the magnet because they were limited by the technology of their time. The applications of magnets today have opened a new door as to how we can harness the power of a magnet. I had a basic working knowledge of how magnets worked, such as polarity, but with researching different aspects of the magnet I have learned that we need to advance the potential capabilities of the magnet and fully understand how we can harness the magnet.... [tags: Magnetic field, Electromagnetism, Magnetism]
1704 words (4.9 pages)
- Interstellar Magnetic Fields and Gases Interstellar magnetic fields play an important role in our galaxy by returning stellar material back out into interstellar space. The magnetic fields are frozen in place within the hot ionized gases of the interstellar medium acting as an additional energy reservoir; the magnetic fields wear several hats regarding the work that needs to be done in our galaxy. However, there is still little known about the all of the roles the ISMF plays. There is a division between large and small scale fields; the former found on the scales of the spiral arms of our galaxy, and the latter found within the interstellar space.... [tags: Magnetic field, Magnetism, Electromagnetism]
1687 words (4.8 pages)
- 2) Explain, using diagrams, armature reaction in a dc motor, the effects it has on the motor and methods to reduce it. Explanation: DC motor: A DC motor is any class of electrical machines that converts direct current electrical power into mechanical power. The most common types rely on magnetic fields. Armature: The part of an electrical motor or generator that produces an electric current when it turns in a magnetic field. Magnetic flux: Magnetic flux is the number of magnetic field lines (also called as magnetic flux density) passing through A closed surface such as conducting coil.... [tags: Magnetic field, Electromagnetism, Dynamo]
728 words (2.1 pages)
- Why Earth 's Magnetic Shield Matters Prompt #1: Did it surprise you to know how much our magnetic field protects us? Yes, it surprises me, I did not expect that the magnetic field was an essential key for organic life. I think this is an essential aspect to find a new ex-planet that can hold the future of humanity. How do you think life on Earth would be affected if magnetic field weakened significantly? I think, if the magnetic field weakened significantly, the life would evolve considerably adapting to the new earth conditions.... [tags: Earth, Solar System, Earth's magnetic field, Sun]
762 words (2.2 pages)
- Missing figures/equations My goal in writing this paper is two fold. Goal one is to try and understand how a stationary magnet exerts force by means of a magnetic field (even across a complete vacuum). Frequently, electromagnetic fields are compared to the gravitational field. Goal two is to explore the similarities between the two types of fields to see if comparison throws any light on the mechanism of magnetic field generation. The term action-at-a-distance is often used to describe forces that travel through space and exert their effect without directly touching the objects acted upon.... [tags: physics science magnet magnetic field]
1224 words (3.5 pages)
- It is not easy feat to become an inspiration of Albert Einstein, considering that he is one of the most famous and recognized scientist. Of three people whose picture hung on Einstein’s wall, Michael Faraday was one of them. Although Faraday had come from a lower class in the 1800s, his eagerness to learn more about the world propelled him to great discoveries that changed the world. One of the most important findings for the future of both technology and the field of physics was Faraday’s breakthrough of the electromagnetic induction and his discovery of the magnetic field.... [tags: Magnetic field, Electromagnetism, Michael Faraday]
1508 words (4.3 pages)
- A total of six various motors were directly derived from the prototype motor through displacement of outer hysteresis disks and turning off/changing polarity of supply of one of the stators. These motors are depicted in Fig. 34. Fig. 34(a) displays a circumferential flux single stator-single rotor motor named M1. When the prototype motor is supplied only by one of the stators and the two external disks are away from the stators, the outcome is motor M1. It should be noted that the only hysteresis disk of this motor is the middle disk with a thickness twice as large as that of external disks.... [tags: Electric motor, Magnetic field, Permeability]
837 words (2.4 pages)