Megaplume contours in temperature anomaly. Origin of EP87 is unknown. Both plumes were smaller and had lower temperature anomalies than EP86 or EP87. Summary of hydrothermal temperature anomalies observed along the crest of the Juan de Fuca Ridge, including Axial Volcano, from 1985 to 1989. For clarity, segments and the overlying plumes are displayed individually, without overlap.
Triangles show location of known venting sites.
Location map for East Pacific Rise spreading centers. Solid circles indicate locations of axial discontinuities. Triangle shows location of known venting sites in the Guaymas Basin. Contour interval is 0.01 volts, 0.02 m -1 as measured by a simultaneously recording beam transmissometer. Location map for western Pacific marginal basins.