Magnetic anomalies

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  • Magnetic Anomalies
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  • Local variation in the Earth's magnetic field resulting from variations in the chemistry or magnetism of the rocks. Mapping of variation over an area is valuable in detecting structures obscured by overlying material. The magnetic variation in successive bands of ocean floor parallel with mid-ocean ridges is important evidence supporting the theory of seafloor spreading, central to plate tectonics.
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Abstract from DBPedia
    In geophysics, a magnetic anomaly is a local variation in the Earth's magnetic field resulting from variations in the chemistry or magnetism of the rocks. Mapping of variation over an area is valuable in detecting structures obscured by overlying material. The magnetic variation (geomagnetic reversals) in successive bands of ocean floor parallel with mid-ocean ridges was important evidence for seafloor spreading, a concept central to the theory of plate tectonics.

    磁気異常(じきいじょう、英語: Magnetic anomaly)とは、地球上における、地磁気の局所的(地域的)な異常をいう。地磁気異常(ちじきいじょう)とも呼ばれる。地球上において、地磁気は一様に分布しているわけではなく、不規則な磁場が混ざっており、これを「磁気異常」または「地磁気異常」と呼ぶ。地磁気の地域的な地殻構成物を基因とする異常である。物理探査の一種である磁気探査は、磁気異常の観測などにより行われる。

    (Source: http://dbpedia.org/resource/Magnetic_anomaly)