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Book Chapter

Magnetic Frequency-depth Relationship

By
R.I. Gibson
R.I. Gibson
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Published:
January 01, 1998

Abstract

Shallow density and susceptibility contrasts produce narrow, or high-frequency, anomalies, while deeper contrasts result in broader, low-frequency anomalies. We can use this characteristic of the gravity and magnetic fields to determine depths to sources, both qualitatively and quantitatively. Because gravity signatures come from everywhere, from the air to the Earth's core, such inferences are often not straightforward or reasonably unique. But most magnetic anomalies come from only a few rock types, such as volcanics, intrusives, and basement rocks. Magnetic data therefore can be used to estimate depth to basementa classic use for such data. The illustration shows how the anomalies change from narrow over shallow basement to broad over deeper basement.

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Contents

Society of Exploration Geophysicists Geophysical References Series

Geologic Applications of Gravity and Magnetics: Case Histories

Richard I. Gibson
Richard I. Gibson
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Patrick S. Millegan
Patrick S. Millegan
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Society of Exploration Geophysicists
Volume
8
ISBN electronic:
9781560801832
Publication date:
January 01, 1998

GeoRef

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