Distributed Acoustic Sensing for Geophysical Monitoring

Distributed acoustic sensing (DAS) harnesses fibre-optic cables as continuous arrays of seismic sensors by monitoring scattered laser pulses. This technology transforms existing telecommunication and dark-fibre networks into dense, high-resolution monitoring systems, enabling centimetre-scale strain measurements over thousands of channels. Coupled with advanced signal processing, machine learning and interferometric techniques, DAS is reshaping our ability to observe seismicity, map subsurface structures and track environmental dynamics in urban, marine and alpine settings. Its low per-channel cost, real-time data acquisition and compatibility with pre-installed infrastructure afford a step-change in spatio-temporal coverage. Applications encompass early warning for earthquakes and volcanic eruptions, characterisation of shallow shear-wave velocity profiles, detection of microseisms in glaciated terrain, monitoring of ocean–solid earth interactions and urban geohazard surveillance. Despite challenges such as variable fibre-to-ground coupling, high noise levels and data management demands, recent methodological advances have broadened the scope and accuracy of DAS for geophysical monitoring worldwide.

Research from Nature Portfolio

Researchers have developed a semi-supervised deep-learning framework tailored to the ultra-dense spatial sampling of DAS data, overcoming limitations of conventional seismic models. By generating and refining noisy labels of P- and S-wave arrivals, this approach achieves accurate phase picking and improved earthquake detection performance. Complementary work has demonstrated the viability of long-distance telecommunication cables for continuous seismic monitoring in urban and remote regions. Analysis of over a year of fibre-optic acquisitions, compared with co-located seismometers, has quantified detection probabilities across a broad magnitude range and introduced spectral analysis of fibre data as a tool to probe earthquake dynamics. In a seminal study, broadband strain fields captured along a multi-kilometre fibre on a volcanic rift provided un-aliased, high-resolution images of faults and dykes. These measurements validated seismic responses over a wide frequency band, revealing structural features with unprecedented detail and suggesting that global networks of telecommunication cables could serve as pervasive seismic arrays.

Distributed Acoustic Sensing for Geophysical Monitoring publication trend

The graph below shows the total number of articles in distributed acoustic sensing for geophysical monitoring across all publications each year (not limited to Nature Index journals).

Technical terms

Distributed Acoustic Sensing (DAS): A technique that uses backscattered laser pulses in fibre-optic cables to measure ground strain continuously at high spatial density.

Ambient noise interferometry: A method exploiting background seismic noise correlations to retrieve Green’s functions and infer subsurface properties without active sources.

Phase picking: The identification of arrival times of seismic wave phases (P-waves and S-waves) for event detection and localisation.

Shear-wave velocity (Vs): The speed at which transverse seismic waves propagate through subsurface materials, used for characterising stiffness and stratigraphy.

Fibre-to-ground coupling: The mechanical interaction between an optical cable and its surroundings, influencing sensitivity and noise characteristics.

References

1. Seismic arrival-time picking on distributed acoustic sensing data using semi-supervised learning. Nature Communications (2023).
2. Seismic monitoring using the telecom fiber network. Communications Earth & Environment (2024).
3. Dynamic strain determination using fibre-optic cables allows imaging of seismological and structural features. Nature Communications (2018).
4. Enhancing subsurface seismic profiling with distributed acoustic sensing and optimization algorithms. Journal of Rock Mechanics and Geotechnical Engineering (2025).
5. Sensing Earth and environment dynamics by telecommunication fiber-optic sensors: an urban experiment in Pennsylvania, USA. Solid Earth (SE) (2021).
6. Evaluating seismic beamforming capabilities of distributed acoustic sensing arrays. Solid Earth (SE) (2021).