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We call OBSs to instruments that are generally larger in size (~1m by 1m by 1m), have sensors capable of responding to lower frequency sources, and operate in shallow to very deep ocean depths (up to ~6,000 m). OBS are generally deployed from ships as free-fall instruments which sink due to the weight of an anchor (
We call OBNs to instruments that are smaller in size (~1 foot by 1 foot ~ 6 inches), are sensitive to higher frequency sources, and operate in shallow to intermediate ocean depths (up to ~3,000 m). Due to their reduced size, OBNs lack buoyancy and therefore have to be deployed on, and retrieved from, the seafloor using remotely operated vehicles (ROV).