California Fiber-Optic Cables Now Monitor Earthquake Waves
The research project leverages existing broadband infrastructure to improve seismic detection in high-risk coastal regions.
Updated on Oct. 15, 2026 in Geology
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Researchers at Cal Poly Humboldt are utilizing existing fiber-optic infrastructure to monitor seismic activity in California. This research project, now in its second year, repurposes unused dark fiber strands to detect earthquake vibrations across the region.
Why it matters
By transforming internet cables into extensive vibration sensors, this approach provides a cost-effective way to densify seismic monitoring networks in high-risk zones like Humboldt County. The project bridges the gap between state broadband expansion and geophysical research.
The project uses laser-based instruments to monitor thousands of miles of fiber-optic cables currently serving California. These strands function as line sensors that detect vibrations, a significant shift from traditional point-based seismometer arrays.
The players
Cal Poly Humboldt
A university research institution focused on regional seismic studies in northern California.
U.S. Geological Survey
A federal scientific agency that provides reliable scientific information about the Earth and its natural hazards.
Vero Networks
A telecommunications infrastructure provider facilitating access to fiber-optic networks for the study.
The details
The system utilizes distributed acoustic sensing where laser instruments send light pulses through dormant fiber strands to detect ground movement. As seismic waves interact with the fiber glass, the physical strain alters the light signal, allowing researchers to track vibrations across the entire length of the cable. This method effectively turns existing telecommunications infrastructure into a high-resolution, long-range seismic network.
Timeline
2025 marked the start of the first year of the research project.
2026 confirms the project has entered its second year of operation.
The Tech Race
This project seeks to augment traditional seismic monitoring by leveraging the massive scale of state broadband infrastructure. It competes with legacy sensor deployments by providing continuous line-monitoring capabilities that standard point-based devices cannot match.
This research primarily benefits the academic and geophysics communities by expanding current monitoring capabilities in seismic-prone zones. While the technology is currently research-stage, successful data processing improvements could eventually integrate into operational warning systems.
The takeaway
The project demonstrates a dual-use case for California's middle-mile broadband expansion, potentially turning internet architecture into a critical public safety asset. Observers should track upcoming research publications for updates on the integration of these signals into active seismic alert networks.
Further reading
For broader context on current regional seismic activity, see Geology.
Source note: This article includes information reported by Jefferson Public Radio.
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