The Southern Hydrate Summit 1 Seafloor study site, situated on the continental slope off the coast of Oregon at a water depth of ~ 775 m, hosts abundant deposits of methane ice (methane hydrates) that are buried beneath, and sometime exposed at the seafloor. The deposits vent methane-rich fluids and bubbles that escape through seeps on the ocean bottom. At Southern Hydrate Ridge plumes of bubbles rise several hundred meters above the seafloor. Dense and fascinating communities of microbes and animals with symbiotic microbes in their guts are fueled by these escaping gases.  These seeps provide a unique opportunity to study ocean chemistry, quantifying chemical fluxes from the seafloor and the impacts of methane release on overlying seawater and biota.

Methane is a powerful greenhouse gas and, therefore, quantifying the flux of methane from the seafloor into the hydrosphere is critical to understanding carbon-cycle dynamics and the impacts of global warming on methane release, particularly in the context of the hydrates response to seismic events.

This Low-Power JBox (LJ01B) rests on the seafloor and contains geophysical and near seafloor water column instrumentation, and is attached to a fiber-optic cable. Instrumentation hosted on the JBox is largely geophysical in nature, hosting both short-period and broadband seismometers. The fiber-optic cable provides the JBox with significant power and 1 Gb communication bandwidth for two-way communication to instruments for their operation and transmission of data to shore. This JBox is also co-located with a Medium-Power JBox that collects a complementary suite of seafloor and water column measurements.


This site includes following instruments. To learn more about an instrument type, select its name on the left. To see the relevant data streams for a particular instrument, select the instrument code in the first column which will take you to the OOI Data Portal.

Instrument Depth Node Instrument
Make & Model
RS01SUM1-LJ01B-12-VEL3DB104 779m Low-Power JBox (LJ01B) 3-D Single Point Velocity Meter (VEL3DB) Nobska - MAVS-4
RS01SUM1-LJ01B-05-OBSBBA101 779m Low-Power JBox (LJ01B) Broadband Ocean Bottom Seismometer (OBSBBA) Guralp - CMG-1T/5T
RS01SUM1-LJ01B-05-HYDLFA104 779m Low-Power JBox (LJ01B) Low Frequency Acoustic Receiver (Hydrophone) (HYDLFA) HTI - 90-U
RS01SUM1-LJ01B-06-OBSSPA103 779m Low-Power JBox (LJ01B) Short-Period Ocean Bottom Seismometer (OBSSPA) Guralp - CMG-6TF
RS01SUM1-LJ01B-07-OBSSPA102 779m Low-Power JBox (LJ01B) Short-Period Ocean Bottom Seismometer (OBSSPA) Guralp - CMG-6TF
RS01SUM1-LJ01B-08-OBSSPA101 779m Low-Power JBox (LJ01B) Short-Period Ocean Bottom Seismometer (OBSSPA) Guralp - CMG-6TF
RS01SUM1-LJ01B-09-PRESTB102 779m Low-Power JBox (LJ01B) Tidal Seafloor Pressure (PRESTB) Sea-Bird - SBE 54