Seismic refraction experiment on the Mid-Atlantic Ridge in the FAMOUS area

Abstract

WE report results from ocean bottom seismographs (OBS)1 and sonobuoys, in which unreversed refraction lines have been shot along and across the median valley of the Mid-Atlantic Ridge. P-wave arrivals indicate a structure under the median valley with layer 2 overlying 7.3 km s−1 mantle. Under the mountains on the ridge crest P and S arrivals suggest that layer 2 overlies layer 3, which in turn overlies 7.3 km s−1 mantle.