Seismologist W. Steven Holbrook and oceanographer Raymond Schmitt might be forgiven for talking past each other aboard a research cruise. Oceanographers normally drop probes overboard, measuring the ocean’s temperature, chemistry and motion. To seismologists, however, the ocean is in the way of their measurements: They typically tune their microphones to detect echoes from below the seafloor in search of clues about Earth’s structure. But over the past five years, Holbrook and Schmitt have learned to listen to each other — and to apply seismic techniques to hear hints of the ocean’s structure.
