WHOI is designing and building new-generation ocean-bottom seismographs (OBSs) for long-term deployments of more than a year. The four orange fiberglass “hardhats,” mounted on a plastic grillwork, contain batteries and electronics. A differential pressure gauge measures earthquake-generated waves in the water. The seismometer is housed in a metal sphere attached to an swivel at right. When the OBS is deployed, a line corrodes, positioning the seismometer on the seafloor. (Jack Cook.)[back]
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