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Ocean-Bottom Seismograph

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Ocean-bottom seismometer diagram
A long-term ocean-bottom seismograph 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 seismograph has been installed on the sea floor. (Jack Cook, WHOI)