top banner image of tubeworms
spacer
horizontal bar
spacer
NeMO Home About NeMO Expeditions NeMO Explorer NeMO Net Education
spacer image
horizontal bar
spacer image
Check out related links
. Welcome

More information:

Flash animation of how the NeMO Net system works:

NeMO Net Background

Map of ASHES hydrothermal vent field

  NeMO Net :
  NeMO Net location map
Axial volcano and NeMO Net, click for full size map
 
is a two-way communication system which links monitoring instruments on an active submarine volcano to the Internet. The site of this seafloor observatory is Axial volcano, located about 250 miles off Oregon's coast and 1 mile underwater.

The NeMO Net system uses acoustic modems to relay data from seafloor instruments to a buoy at the surface, which in turn sends the data to NOAA's Pacific Marine Environmental Laboratory via satellite. In 2003-4, two instruments on the seafloor are linked into NeMO Net: a Remote Access Sampler (RAS) in the ASHES vent field, and a Bottom Pressure Recorder (BPR) near the center of the caldera. The map above shows the locations of the instruments and the NeMO Net buoy. The plots below show some of the latest data that has been transmitted from the seafloor.

UPDATE: NOTE THAT THE 2003 NEMO NET BUOY WAS RECOVERED ON JULY 18, 2004. THIS MEANS THAT NO REALTIME DATA WILL BE TRANSMITTED TO THIS SITE UNTIL THE 2004 BUOY IS DEPLOYED DURING THIS YEAR'S NEMO EXPEDITION, SEPTEMBER 19-28, 2004.

Check out related links . Daily Temperature Data (RAS)
 
The Remote Access Sampler (RAS) monitors the chemistry and temperature of a hydrothermal vent (Virgin Vent) in the ASHES vent field. Data from two temperature probes on the RAS are displayed. Temperature plots for the last 3 days are displayed for each probe as well as the cumulative data. Predicted tides are shown in black for comparison. Temperatures for probes T1 and T2 are displayed only. T3 records background, ambient temperature.
Check out related links . Bottom Pressure Recorder (BPR)


More information:

The BPR instrument

BPR on deck, click for full size

 

The BPR is located near the center of Axial caldera, and precisely measures the pressure of the overlying ocean, as a way to monitor for inflation or deflation of the volcano. The raw BPR data (purple) closely follows predicted ocean tides (black). But after subtracting the tides from the BPR data, the difference (red) shows any sudden changes in seafloor height which may signal the onset of an eruption at the volcano. Three days of pressure data and the cumulative data are displayed in separate plots, with and without tides.

Check out related links . The NeMO Net buoy


More information:

The NeMO Net Buoy

 

 
  image of NeMO Net buoy deployment, click for full size
View of the NeMO Net buoy being deployed over the side of the R/V Thompson. Click for a larger view.
 
The NeMO Net buoy is the critical communications link between the instruments on the seafloor and scientists on shore. The buoy communicates to stations on land via satellite, and to the seafloor via acoustic modems. Acoustic modems are like computer modems, but use sound instead of electricity to transfer information.
spacer image
horizontal bar
spacer image
  Major funding for NeMO Net provided by: PMEL logo Pacific Marine Environmental Laboratory NURP logo West Coast National Undersea Research Center
spacer image
horizontal bar
spacer image
NeMO Home |About NeMO | Expeditions | NeMO Net | Explore | Dive! | Education
spacer
horizontal bar
spacer
spacer imagePrivacy Policy | Disclaimer | oar.pmel.vents.webmaster@noaa.gov
NeMO home NeMO Net home NOAA home