Question
The following magnetic anomaly (in total field) is recorded along a south to north profile across a body that can be equated to a single pole.
Consider the following statements
Statement I: The surveyed area is close to the magnetic equator
Statement II: The pole lies below the distance coordinate 200 m
The correct answer is
Statement I and II are true
Let's analyze the given statements based on the provided magnetic anomaly diagram and geophysical concepts.
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Understanding Magnetic Anomalies:
- A magnetic anomaly is a variation in the Earth's magnetic field resulting from changes in the distribution of magnetic minerals in the Earth's crust.
- The diagram shows the anomaly along a south to north profile.
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Analysis of Statement I: "The surveyed area is close to the magnetic equator."
- Near the magnetic equator, magnetic anomalies typically exhibit low inclinations due to the horizontal component of the magnetic field being dominant.
- The anomaly profile shows an S-shaped curve, which indicates a low magnetic inclination consistent with being near the magnetic equator.
Conclusion: Statement I is true.
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Analysis of Statement II: "The pole lies below the distance coordinate 200 m."
- The location of a magnetic pole is often identified as the point where the anomaly is at its peak or trough.
- In the provided diagram, there is a notable change at 200 m, suggesting the presence of a pole beneath this coordinate.
Conclusion: Statement II is true.
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Final Conclusion:
- Both statements are consistent with the given data and analysis.
Therefore, the correct answer is: "Statement I and II are true."
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Important Questions from Magnetic Methods
- What is the value of the Earth’s magnetic field (in Oe) at a place where its vertical and horizontal components are equal if the magnetic field at the equator is $0.30\text{ Oe}$?
- The positions of the maximum and minimum anomaly values are observed at distance coordinates $35\text{ m}$ and $135\text{ m}$ respectively along a total field anomaly magnetic profile across a body resembling a single pole at the magnetic equator. Which of the following statements is true?
- If $(F_{max}, F_{min})$, $(V_{max}, V_{min})$ and $(H_{max}, H_{min})$ are the maximum and minimum values of the Earth's normal magnetic field on the Earth's surface, and its vertical and horizontal components respectively, then
- The total field magnetic anomaly at a location of magnetic latitude $30^\circ N$ due to an inhomogeneity is zero. Then the ratio of the anomalies in the vertical and horizontal components due to the same inhomogeneity would be
- What is the ratio of the Larmor precession frequencies measurable on the Earth's surface at the magnetic latitudes $30^\circ$ and $60^\circ$?
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