Magnetic and seismic data have confirmed the presence of an east-striking fracture zone south-southeast of Hawaii, ∼200 km north of the Clarion Fracture Zone. Absence of the rugged topography usually associated with oceanic fracture zones indicates that the large magnetic anomaly found there reflects dike intrusions into the zone. It is suggested that crustal opening may be occurring where the zone intersects the Hawaiian swell. This crustal opening could be in response to right-angle tensional stress as the swell migrates across the fracture.

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