In September 1984, the research submersible Alvin provided direct observations of three major hydrothermal vent areas along the southernmost segment of the Juan de Fuca Ridge (JFR). The submersible operations focuses on specific volcanologic, structural, and hydrothermal problems that had been identified during the preceding 4 years of photographic, dredging, acoustic imaging, and geophysical studies along a 12 km long section of the ridge. A continuously maintained (from 1981 to the present) net of seafloor-anchored acoustic transponders allowed the observations from Alvin to be directly tied to all previous USGS data sets and NOAA water column surveys from 1984 to the present. We review the dive program and present a brief synthesis of the geology of the vent sites together with sample and track line compilations.-from Authors
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Submersible observations along the southern Juan de Fuca Ridge: 1984 Alvin program.