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Ocean-Bottom Seismometer

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Ocean-bottom seismometer diagram
A long-term ocean-bottom seismometer designed to work for more than a year. The four yellow ?hardhats? protect equipment from the high pressure at depth. A pressure gauge measures earthquake waves in the water. The seismometer is housed in a metal sphere that drops gently into place after the entire instrument has been installed on the sea floor. (Jack Cook, WHOI)