Structure of the southern Juan de Fuca Ridge from seismic reflection records

Journal of Geophysical Research B: Solid Earth
By: , and 

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Abstract

Twenty-four-channel seismic reflection records were obtained from the axial region of the southern Juan de Fuca Ridge. Two profiles are normal to the strike of the spreading center and intersect the ridge at latitude 44°40′N and 45°05′N; a third profile extends south along the ridge axis from latitude 45°20′N and crosses the Blanco Fracture Zone. Processing of the axial portions of the cross-strike lines resolved a weak reflection centered beneath the axis. The reflector is at a depth similar to seismically detected magma chambers on the East Pacific Rise and a Lau Basin spreading center; we suggest that the reflector represents the top of an axial magma chamber. In the migrated sections the top of the probable magma chamber is relatively flat and 1–2 km wide, and the subbottom depth of the chamber is greater where the depth to the ridge axis is greater.

Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Structure of the southern Juan de Fuca Ridge from seismic reflection records
Series title Journal of Geophysical Research B: Solid Earth
DOI 10.1029/JB092iB11p11315
Volume 92
Issue B11
Year Published 1987
Language English
Publisher AGU Publications
Contributing office(s) Pacific Coastal and Marine Science Center
Description 12 p.
First page 11315
Last page 11326