A broadband seismometer is installed inside a buried cassion at Southern Hydrate Ridge by the ROV ROPOS. A follow-on dive will fill the caisson with silica beads, which dampens "noise". The broadband and low frequency hydrophone is installed here to detect both large and small earthquakes that may impact the release of methane gas into the hydrosphere. Photo credit: NSF-OOI/UW/CSSF; Dive R1779; V14.
Dive R1751 was at the Slope Base Site. During the dive, the broadband seismometer OBSBKA101 and low frequency hydrophone HYDLFA101 were installed. The 25 m extension cable running from the broadband to the Medium Powered J-Box MJ01A was connected to port J5. The current meter VEL3DB101 and pressure sensor (PRESTA101) were moved to their final positions and the extension cable (RS01W6) from LV01A to Primary Node PN1A (SP2 port) was connecte. The extension cable RS01W5 from MJ01A was connected to the Primary Node PN1A-SP3 port. Video credit: NSF-OOI/UW/CSSF; Dive R1751; V14.
The broadband seismometer (left) and low frequency hydrophone (right) are installed on the floor of Axial Seamount at the Central Caldera Site. The 7-function manipulator of ROPOS is connecting the extension cable to the medium powered junction box. The white bags inssulate the broadband from acoustic "noise" associated with curents flowing over the instrument.
A broadband seismometer and a low-frequency hydrophone are being placed on a flat basaltic plateau at the Axial Seamount Central Caldera Site, awaiting connection to medium power J-Box MJ03F. On a follow-on dive a 4.6-km cable will be installed. This area is of particular interest because the caldera floor is rapidly being uplifted, suggesting that melt is migrating into the magma chamber below. Photo credit: NSF-OOI/UW/CSSF; Dive R1725; V14.
A short-period seismometer (OBSSPA301) is installed ~1.3 km east of the ASHES hydrothermal field. A cable connects to a medium power junction box in the field. During testing with ROPOS, this seismometer recorded a small earthquake. VISIONS '13, Leg 4. Photo credit: NSF-OOI/UW/CSSF.
This short-period seismometer was deployed on a flat sheet flow ~ 1.3 km east of the ASHES hydrothermal field in 2013. The black ball in the yellow circle shows that it is perfectly level, helping to insure that the highest quality data comes off of this network. Axial Volcano is likely to be quite seismically active and we are anxious to get the real-time data on shore next year. This will help us understand magma and fluid migration in the subsurface of the volcano…and eventually these data may help us predict an eruption. VISIONS '13, Leg 4. Several earhquakes were detected in real-time during testing of these seismometers in 2013. Photo credit: NSF-OOI/UW/CSSF.