How can you measure seafloor motion with millimeter-scale accuracy through two miles of seawater? The satellite-based GNSS technique used on land doesn’t work in the ocean, so we turn to GNSS-Acoustics.
When you combine GNSS and precision acoustics, made possible by advances in sensor technology, the result is incredibly accurate seafloor measurements—precise enough to track tectonic plate movement.
GNSS-Acoustics have been used successfully to monitor seafloor motion from research vessels, but vessels are too expensive to be a practical long-term, real-time solution. Enter unmanned systems, which change the whole cost structure of subsea communications.
One of the most exciting developments is the ability to precisely position a Sonardyne seafloor transponder from a Wave Glider in up to 5,000 meters of water depth. Operating at the surface, the wave and solar powered Wave Glider can hold station above the seafloor sensors for many months at a time, serving as a communications gateway to collect and transmit data in real time.
With these advances in technology, seafloor geodesy projects have sprung up around the world, all in pursuit of scientific advances that will help us crack the code on earthquake and tsunami risk, and ultimately save lives.
We explore this further in our latest white paper, where you’ll learn about:
This white paper was originally published in November 2017. Updated October 2019 with additional information.