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Figure 5. Correlation of geophysical fields, seismicity, and hydrothermal occurrences along the Mid-Atlantic Ridge:
(A) Free air gravity anomaly from satellite altimetry data [Sandwell and Smith, 1997] and fracture zones intersecting the MAR.
(B) Seismicity along the MAR (http://quake.geo.berkeley.edu/cnss/), hydrothermal occurrences, and predicted hydrothermal features: 1 - active hydrothermal occurrence, 2 - inactive hydrothermal occurrence, 3 - sulfide mineralization, 4 - methane plume, 5 - area with potential for sulfide mineralization and hydrothermal activity.
(C) S wave velocity section based on the RG5.5 seismic tomography model [Zhang and Tanimoto, 1992] and the classic Bouguer anomaly.

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