Trade-off in production between adjacent seamount chains near the East Pacific Rise

Article Abstract:

Side-scan sonar images and bathymetric data obtained from the Southern East Pacific Rise reveal that the seamounts occurring in chains have a common source. The seamounts are closely spaced within 20 to 25 kilometers and the alternate seamounts are negatively correlated to each other. The magma that is essential to build these seamounts originates from the near-ridge ends of the seamount chains. The magma are produced from plume-like sources in the upper mantle.

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Volcanic action at Axial Seamount

Article Abstract:

A group has been studying the submarine volcano, Axial Seamount which lies on the Juan de Fuca Ridge. They are using long-term continuous monitoring with instruments o the ocean floor and in the water column, along with US Navy SOSUS coastal hydrophone arrays. One finding was the rise of methane concentrations in the plume created by volcanic activity, which may be due to microbiologically mature water which was suddenly heated by the volcanism.

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Hydrological response to a seafloor spreading episode on the Juan de Fuca ridge

Article Abstract:

The observations of a hydrological response to seafloor spreading activity, which resulted in a negative formation-fluid pressure transient is presented. The observations were made with a borehole seal and hydrologic observatory to study the steady-state pressure and temperature conditions in the hydrothermally active area of northernmost Juan de Fuca ridge.

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