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地磁気学

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Magnetic stripes are the result of reversals of the Earth's field and seafloor spreading. New oceanic crust is magnetized as it forms and then it moves away from the ridge in both directions. The models show a ridge (a) about 5 million years ago (b) about 2 million years ago and (c) in the present.[1]

古地磁気学が解き明かす地球の歴史とプレートテクトニクスの謎

古地磁気学地磁気逆転プレートテクトニクス海嶺
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