@prefix cpm: . @prefix dc: . @prefix dcat: . @prefix dce: . @prefix dct: . @prefix dcterms: . @prefix grg: . @prefix iop: . @prefix ns0: . @prefix ns1: . @prefix owl: . @prefix pav: . @prefix prov: . @prefix puv: . @prefix qudt: . @prefix rdf: . @prefix rdfs: . @prefix reg: . @prefix sdo: . @prefix semapv: . @prefix skos: . @prefix sssom: . @prefix void: . @prefix xsd: . rdf:type sdo:DefinedTerm ; sdo:description "An instrument designed to measure movements in the earth's crust while lying on the seabed. The OBS consists of a pressure cylinder containing a seismometer instrument package, glass buoyancy spheres mounted on a floatation assembly, a hydrophone, and recovery aids. This instrument was designed to withstand pressures and temperatures experienced at up to 6000 m depth in the oceanic environment. The OBS sensors include a 2-component gimballed geophone package (Geospace - Model HS1) operating at 4.5 Hz, with a sensitivity of 1.14 v/in/sec and a fixed amplifier gain of +100 db, and a hydrophone (OAS - Model ES2D), operating between 3 - 20 Hz, with a sensitivity of 87 db re 1V/ubar, and a fixed amplifier gain of +71 db."@en ; sdo:inDefinedTermSet ; sdo:name "Geological Survey of Canada Ocean Bottom Seismometer"@en ; sdo:termCode "SDN:L22::TOOL1257" .