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 44ø40'N and 45ø05'N; a third profile extends south along the ridge axis from latitude 45ø20'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.
11,315Resour., Ottawa, Ont., 1978.
U.S. Geological Survey Juan de Fuca Study Group, Submarine fissure eruptions and hydrothermal vents on the southern Juan deFuca Ridge: Preliminary observations from the submersible Alvin,
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