Perspective view of East Pacific Rise and the seismic velocity structure of the underlying mantle. Surprisingly, regions of magma storage in the mantle (shown as orange and red colors) are in many places not centered beneath the plate plate boundary. Courtesy Douglas Toomey [Note from Craig: I have asked Kevin Zelnio, a graduate student . . . → Read More: From The Desk of Zelnio: New Geophysical Study May Point The Direction To New Vent Discoveries