Modeling of the Foca-Uzunada magnetic anomaly and thermal structure in the gulf of Izmir, western Turkey
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Anomaly (physics)
Anomaly (physics)
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In this paper, the magnetic exploration technology is applied to the geomagnetic anomaly analysis of hollow ferroconcrete cylinders. By using the method of volume integral, the analytic equations of various components of the geomagnetic anomaly are formulated. And then the central section, the planar isogram and the three-dimensional map of the geomagnetic anomaly vertical component Za are drawn. Furthermore, the distribution features of the magnetic anomaly are detected. In addition, this paper has analyzed inversion problems on the height and the site of hollow ferroconcrete cylinder, and studied the relationship between the altitude of magnetic survey and the magnetic anomaly. The results are theoretically and practically useful in archaeology, engineering exploration and such military fields as the reconnaissance and anti-reconnaissance of this type of objects.
Anomaly (physics)
Magnetic survey
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Anomaly (physics)
Greigite
Section (typography)
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Anomaly (physics)
Beaufort sea
Free-air gravity anomaly
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Near-Surface Geophysics is to understand the subsurface geological settings and the success of these methods is based on certain assumptions and constraints. The gravity and magnetic methods are highly useful and most popular geophysical techniques in mineral exploration and structural delineations. In reality the endogenic and exogenic geological processes produce most irregular shaped bodies and many times multiple in nature occurring side by side and overlapping with one another. Gravity and magnetic anomalies on such closely spaced bodies cannot produce distinguished anomalous features. This paper deals with the gravity and magnetic anomaly characteristics over closely spaced multiple bodies and their possible misinterpretations. For this a number theoretical closely spaced models considered by varying the model parameters such as depths and dips. The inversion of these model anomalies yields the possible misinterpretations and criteria to distinguish the multiple bodies. The interpreted abnormally high density in gravity inversion and fluctuations on a broad magnetic anomaly profile may indicate the presence of closely spaced multiple subsurface bodies. Many times overlapping subsurface geological formations produce cumulative gravity and magnetic anomaly responses with small undulations over a broad anomaly trends which needs to be decomposed based on the anomaly trends and local geology.
Anomaly (physics)
Free-air gravity anomaly
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The application of integrated geophysical methods to aeromagnetic anomaly inspection of Huidong area
According to the characteristics of the aeromagnetic anomaly in Huidong area,the authors have reached the conclusion that the aeromagnetic anomalies are caused by magnetic bodies in the depth.The integrated geophysical methods,which included ground precision-magnetic survey and audio magnetotelluric sounding(AMT),were used to inspect the aeromagnetic anomaly.Through combining the advantages of different geophysical methods,the authors improved the reliability of the geophysical interpretation.Using integrated interpretation of the data from gravity,magnetic survey and AMT,the authors initially identified the distribution characteristics of the anomaly body in the depth.The integrated geophysical results provide an ore-prospecting clue for the further exploration in this area.
Aeromagnetic survey
Anomaly (physics)
Geophysical prospecting
Geophysical survey
Exploration geophysics
Magnetic survey
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A satellite magnetic anomaly map made using the POGO magnetic field data is compared to three maps made using Magsat data. A total of 14 anomalies with magnitudes greater than 3 nT can be identified in all four of the maps poleward of 60°S latitude. Forward models of the Antarctic continental and oceanic lithosphere are produced which use magnetic crustal thickness based on seismic and heat flow data, and which also use the distribution of the Cretaceous Quiet Zone from marine geophysics. These simple models can explain significant parts of eight of the 14 identified anomalies. The remaining anomalies may be caused by lateral variations of magnetization, inadequate models of the magnetic crustal thickness, or remanent magnetizations in directions other than the present field. In addition, contamination of the magnetic anomaly maps by fields of time-varying external origin (and their corresponding internal parts) is still a significant problem in the Antarctic region.
Anomaly (physics)
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Anomaly (physics)
South Atlantic Anomaly
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