Abstract
BATHYMETRIC data and side-scan sonar images collected near the southern East Pacific Rise between 15° and 19° S1, 2 have revealed many seamounts on the west flank of the rise, most of which are organized into chains running perpendicular to the rise axis. The number of seamounts of >5 km diameter is at least twice that expected for average East Pacific sea floor3. The formation of numerous, small ( 5 Myr), linear seamount chains and the tendency for fresh lava flows to be found primarily at the near-ridge ends of the chains suggest that there are plume-like sources in the upper mantle, which are relatively stationary, active for extended periods and affected by adjacent sources.
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