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The magnetic-anomaly pattern shows characteristic changes across the ocean-continent boundary. At the Northeast Atlantic passive margin, linear oceanic anomalies disappear at the edge of the continent as that edge is defined by seismic means. In the western North Atlantic off Florida there is an anomalous strip of ocean crust, but a change in character of the magnetic anomalies can still be seen. At the Aleutian active margin, oceanic anomalies are destroyed along a line that lies about 100 km landward of the trench axis. At the Japan active margin a similar situation exists. It is not clear why oceanic anomalies are so drastically quenched at this point near the trenches, but this condition may be related to the fact that the oceanic plate is carrying the magnetic layer through the Curie isotherm or to the seismic activity.

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