22 May 1998
Vol 280, Issue 5367

About The Cover

Sea-floor topography, gravity anomalies, and seismic Rayleigh wave velocities measured in the Mantle Electromagnetic and Tomography (MELT) Experiment on the East Pacific Rise (the center of the image is located at 17oS, 113oW; image width left to right is 640 kilometers). Ocean-bottom seismometers were used to detect partial melting of the mantle and the upwelling of magma, which erupts at mid-ocean ridges. See the eight Reports beginning on 1215. [Image: D. Scheirer; based on data from D. Scheirer and D. Forsyth]