The seafloor, a critical yet often overlooked environment, plays a vital role in our planet’s ecological balance and societal infrastructure. Understanding the dynamic processes that shape this underwater landscape is essential for informed conservation policies, underwater infrastructure planning, and geohazard management. Enter Geo-Sense a groundbreaking instrument developed by the Monterey Bay Aquarium Research Institute (MBARI) that is set to revolutionize seafloor monitoring.
Since early 2026, MBARI researchers have been testing Geo-Sense, a portable instrument that leverages distributed acoustic sensing (DAS) technology. This innovative tool measures tiny strains and vibrations on a fiber-optic cable laid on the seafloor, enabling scientists to track a wide range of geological processes, from underwater landslides to earthquakes. The recent publication of a detailed description of Geo-Sense in the journal Scientific Reports highlights the collaborative effort and expertise that brought this instrument to life.
Geo-Sense: A Game-Changer for Ocean Science
For years, scientists have struggled to collect comprehensive data on the many active geological processes that shape the seafloor. These processes, including earthquakes, underwater landslides, currents, fluid seepage, and volcanic activity, often occur suddenly, span large areas, or take place when observation tools are not present. Traditional methods have relied on fiber sensing of existing telecommunications cables, which, while valuable, are not always located where scientists need them.
Geo-Sense addresses this challenge by allowing scientists to place a dense fiber-optic sensor anywhere on the seafloor. This capability enables continuous, high-resolution monitoring of seafloor processes in real-time. The ability to observe these occurrences at fine spatial and temporal scales is a significant advancement for seafloor science, providing unprecedented insights into how the submarine landscape evolves over time.
MBARI’s Unique Expertise and the Ideal Testing Ground
Geo-Sense is a testament to MBARI’s interdisciplinary approach, combining expertise in marine geology, geophysics, fiber-optic sensing, mechanical and electrical engineering, ship operations, and deep-sea deployment. This collaborative environment fosters innovation and allows for the development of cutting-edge technologies like Geo-Sense.
MBARI’s proximity to Monterey Canyon one of the most dynamic submarine canyons in the world, provided an ideal natural laboratory for testing Geo-Sense. The powerful turbidity currents that push sediment down the canyon offered researchers the perfect conditions to evaluate the instrument’s capabilities in a challenging environment.
Overcoming Challenges in Deployment and Recovery
The development of Geo-Sense presented numerous challenges, with the deployment and recovery of the fiber-optic cable being particularly daunting. The cable, which is one kilometer long, had to be strong enough to withstand the stress of being dragged across the uneven seafloor while remaining sensitive enough to record useful signals. This combination of scientific sensitivity, engineering robustness, and operational practicality required the expertise of MBARI’s engineering and marine operations teams.
These teams were instrumental in identifying the right cable, developing appropriate deployment and recovery strategies, tracking the cable’s position and movement through the water column, and integrating all components into a mechanically robust system. Their efforts ensured that Geo-Sense could withstand the rigors of operations at sea.
The Future of Geo-Sense and Its Impact on Marine Geology
Geo-Sense represents a significant leap forward in marine geology, providing researchers with a powerful, portable, and versatile tool for high-resolution monitoring of seafloor processes. The instrument’s ability to observe the seafloor as a dynamic environment is particularly exciting, as it allows scientists to collect data from places where the seafloor can change quickly, yet direct observations are rare.
The next adventure for Geo-Sense will be its deployment to monitor activity at the Kolumbo submarine volcano in the Mediterranean Sea later this year. This project is particularly exciting because volcanic systems are dynamic, hazardous, and difficult to monitor at high resolution on the seafloor. The long-term goal is to develop flexible platforms with DAS technology that can be rapidly deployed in diverse environments, from deep-sea canyons to Arctic fjords, to monitor geohazards, seafloor processes, and environmental change.
The data collected by Geo-Sense will provide resource managers and policymakers with the information they need to make informed decisions about marine protected areas, underwater infrastructure, and coastal geohazards. This technology is a game-changer for marine geology, helping us better understand the processes that shape the seafloor.
The development of Geo-Sense was made possible by the David and Lucile Packard Foundation and its longtime support of MBARI’s work to advance marine science and engineering to understand our changing ocean.
