Broadband Ocean Bottom Seismometers provide characterization of seismicity/earthquake activity along tectonic plate boundaries where two key phenomena can occur: large-magnitude subduction zone earthquakes and seismicity associated with migration of melt (magma) beneath the seafloor at underwater volcanoes. The array of OOI broadband seismometers are primarily installed to detect earthquakes along the subduction zone of the Oregon margin and at Axial Volcano. Because the seismometers are cabled and, hence, connected directly to shore, they can provide detection of earthquakes in real-time.
The sensors are in a titanium housing, and in sedimented areas (Slope Base, Southern Hydrate Ridge, and at the base of Axial Seamount), the seismometers are buried beneath the seafloor sediments in 60 cm deep X 60 cm diameter caissons (cylindrical retaining structures filled with silica beads) to obtain the highest quality resolution of seismic waves. At the summit of Axial Seamount, there is little sediment, and therefore the broadband seismometer was installed on basement rock, and surrounded by gravel-filled bags.
Instrument Specifics: The broadband seismometers are manufactured by Guralp, instrument model Guralp CMG-1T 360s-50Hz with CMG-5T Strong Motion, DM24/7-EAM Digitizer/Interface + Low Frequency Hydrophone (HTI-90-U). They have an Ethernet (10/100) interface, and are synced to pulse per second timing.
This instrument measures the following data products. Select a data product's name to learn more.
|Broadband Ground Acceleration||GRNDACC||DPS|
|Broadband Ground Velocity||GRNDVEL||DPS|
The algorithm code used to generate data products for this instrument is also available in the ion-functions GitHub repository.Algorithm Code
Instrument Models & Deployed Locations
The OOI includes the following instrument makes and models for this instrument type. Follow the links below to find out where in the OOI this instrument has been deployed. You'll also find quick links for each instrument to Data portal, where you can plot and access data.