A groundbreaking seismic monitoring network developed by researchers from McGill University, Natural Resources Canada, Université du Québec à Montréal (UQAM), and Dalhousie University is revolutionizing how we observe the dynamic environment of the Lower St. Lawrence estuary. This innovative amphibious seismic system is capable of simultaneously detecting an array of phenomena, from earthquakes to marine life communication, offering unparalleled insight into the complex interplay beneath and around one of Canada’s busiest waterways.
Traditional seismic monitoring networks often focus narrowly on tectonic activity, but this experimental deployment integrates ocean-bottom seismometers with coastal and terrestrial stations, forming a comprehensive observational grid. Positioned along the expanse between Rimouski and Sept-Îles, this system operates continuously at an impressive sampling rate of 250 data points per second, enabling it to discern subtle nuances within overlapping natural and anthropogenic signals.
One of the most striking achievements of this hybrid network is its ability to detect twice as many earthquakes as the National Earthquake Monitoring System in Eastern Canada’s seismically active Lower St. Lawrence region. This enhanced seismic sensitivity is complemented by the network’s capacity to capture diverse acoustic signals, including whale calls, ship noise, tidal activities, and mining blasts, all of which occur within distinct frequency bands. Using sophisticated spectral analysis techniques, the researchers successfully isolated these concurrent signals, revealing how anthropogenic noise from heavy shipping traffic potentially interferes with whale communication.
Beyond seismicity, the network unveils the intricate tidal patterns that influence ocean circulation beneath the water’s surface. Such data are pivotal for refining hydrodynamic models that traditionally rely on surface measurements alone. More intriguingly, these subaqueous observations shed light on nutrient fluxes and current regimes that govern whale feeding and migration, highlighting crucial habitat dynamics often overlooked in marine conservation efforts.
This integrative approach addresses limitations in prior studies that primarily utilized land-based seismometers, which were constrained by the estuary’s wide span of up to 100 kilometers. Deploying sensors on the riverbed bridges this observational gap, offering a more granular and spatially comprehensive mapping of marine life acoustic activity.
The implications of this methodological advance stretch beyond scientific curiosity. By producing a single dataset that encapsulates geological, oceanographic, and biological information simultaneously, the system embodies a multifunctional tool for environmental management and policymaking. It holds promise for informing marine traffic regulations and conservation strategies to mitigate the adverse effects of noise pollution on endangered whale populations.
Funded by the Natural Sciences and Engineering Research Council of Canada and the Canada Foundation for Innovation, this research exemplifies cross-disciplinary collaboration and technological innovation. It transforms seismology from a siloed scientific domain into a multidimensional lens for understanding complex ecosystems where geology, biology, and human activity intersect.
As environmental pressures intensify on marine ecosystems worldwide, this amphibious seismic network marks a significant leap toward holistic ocean monitoring, capturing the symphony of Earth’s shifting crust alongside the delicate chorus of its aquatic inhabitants.
Subject of Research:
Not applicable
Article Title:
Lower St. Lawrence Seaway Amphibious Seismic Network for earthquakes and marine soundscape monitoring
News Publication Date:
21-May-2026
Web References:
http://dx.doi.org/10.26443/seismica.v5i1.2044
References:
Liu, Y., Plourde, A., Cairns, G., Darbyshire, F., et al. (2026). Lower St. Lawrence Seaway Amphibious Seismic Network for earthquakes and marine soundscape monitoring. Seismica.
Keywords:
Seismology, Earthquakes, Aquatic animals, Endangered species, Biodiversity conservation, Marine conservation
