NeMO Net Bottom Pressure Recorder (BPR) | |||
The NeMO Net Bottom Pressure Recorder (BPR) is located near the center of Axial caldera at the summit of the volcano. BPRs precisely measure the pressure from the overlying ocean, and by doing so they can detect vertical movements of the seafloor due to volcanic activity (for example, if the seafloor were uplifted the BPR would measure a pressure decrease). The NeMO Net BPR sends back four pressure measurements per hour from the seafloor (purple,in the plots below). After the predictable variations from ocean tides (black curve) are removed, the de-tided BPR data (red) is then evaluated to look for any sudden vertical movements of the seafloor that may signal the onset of a volcanic eruption. |
|||
|
What's new
this year? This is the first year we have had a BPR linked into NeMO Net. Also, we are experimenting this year with a longer-range "omni-directional" acoustic modem on the BPR. This allows the instrument to be farther away from the NeMO Net surface buoy. In future years we hope this will allow multiple instruments to be positioned over a larger area, while still using a single surface buoy as a communication hub. The two RAS samplers have shorter-range "directional" acoustic modem transducers like we have used in previous years. This is why the NeMO Net buoy is located close to the RAS instruments and farther away from the BPR. Previous results from BPR's at Axial |
. | BPR images | ||
NeMO 2002 |About NeMO | Expedition | NeMO Net 2002 | Explorer | Dive! | Education |
Privacy Notice | Disclaimer | nemo.webmaster@noaa.gov |