The CI funded the construction of a total of 60 Ocean Bottom Seismometers (OBSs) by the three Institutional Instrument Contributors (IICs) of the National Ocean Bottom Seismometer Instrumentation Pool (OBSIP). The IIC group at Lamont-Doherty Earth Observatory (LDEO) built 30 OBSs, and the groups at the Scripps Institute of Oceanography (SIO) and the Woods Hole Oceanographic Institution (WHOI) built 15 each.
All 60 OBSs are equipped with Nanometrics Trillium Compact seismometers. In addition to the seismometers, the SIO and WHOI OBSs are equipped with Differential Pressure Gauges (DPGs) while the LDEO OBSs carry Absolute Pressure Gauges (APGs).
Ten of the LDEO instruments are housed in a stardard package and are not deployable in depths shallower than 1000 m. LDEO Standard OBS
Twenty of the LDEO OBSs are installed in trawl-resistant enclosures and are available for deployments in water depths extending from the shelf down to 1,000 m. These 20 OBSs have been deployed via the ship’s wire and recovered using a Remotely-Operated Vehicle (ROV). These instruments are not deployable in water depths greater than 1,000 m. LDEO- Trawl Resistant OBS
The fifteen SIO OBSs are installed in trawl-resistant enclosures, and are deployable at depths extending from the shelf down to 6,000 m. SIO Abalone
The WHOI OBSs are not deployable in depths shallower than 1000 m. All 60 instruments are equipped with 12-month battery packs. WHOI Arra