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Seismic Supply

John Collins (left) and Jeff McGuire examine ocean bottom seismometers (OBSs) outside WHOI’s Iselin Marine Facility. These instruments are deployed on the sea floor to record ground movements from undersea earthquakes. WHOI is part of the U.S. National Ocean Bottom Seismograph Instrument Pool. (Photo by Tom Kleindinst, Woods Hole Oceanographic Institution)