Researchers at Los Alamos National Laboratory have demonstrated that fiber-optic cables buried in simulated lunar soil can detect small earthquakes, raising the prospect that communication lines on the Moon could double as a seismic monitoring grid. The peer-reviewed findings, published in March 2026 in the journal Icarus, arrive as NASA continues planning geophysical missions to the lunar surface, where quakes and meteorite strikes pose real threats to future habitats and crews.
Turning Light Pulses Into Seismic Sensors
The technology at the center of this research is distributed acoustic sensing, or DAS. A DAS system fires laser pulses down a standard fiber-optic cable and measures tiny distortions in the backscattered light caused by ground vibrations. Each meter of fiber effectively becomes its own sensor, turning a single cable into a dense seismic array without additional hardware.
On Earth, DAS has already proven itself as a serious seismological tool. A 2023 study in Nature Communications showed that DAS data can resolve earthquake focal mechanisms, the directional patterns of fault rupture that traditional seismometers need careful placement to capture. By comparing DAS recordings with conventional instruments, the authors demonstrated that fiber-optic measurements can reproduce key details of how faults slip and how seismic energy radiates through the crust.
That performance has drawn sustained interest from U.S. agencies. The National Science Foundation has highlighted DAS as a promising method for monitoring natural hazards such as earthquakes, volcanic unrest, and landslides. Funding records on Research.gov and proposal listings on Grants.gov show ongoing support for fiber-based sensing projects, while resulting publications are preserved through the NSF Public Access Repository. Statistical overviews from the National Center for Science and Engineering Statistics situate this work within broader federal investment in geoscience and engineering. Together, these resources underscore that DAS is already transitioning from experimental demonstrations to operational monitoring on Earth.
Simulating the Moon’s Harsh Soil
The central challenge for lunar DAS is regolith, the loose, powdery soil that blankets the Moon’s surface. Regolith couples poorly with buried instruments because it lacks the moisture and compaction that help transmit seismic waves through terrestrial ground. That weak coupling raises the risk that even sensitive fibers might miss small vibrations or record them too faintly to interpret.
The Los Alamos team addressed this directly by burying fiber-optic cables at varying depths in a controlled testbed filled with simulated lunar regolith. They then recorded real earthquakes as they passed beneath the site. By adjusting the burial depth and the way the fiber was packed into the soil, the researchers could test how strongly the regolith transmitted seismic energy into the cable. Their experiments also compared windy and calm conditions to separate environmental noise, which would not exist on the airless Moon but complicates measurements on Earth.
According to a technical report hosted by the U.S. Department of Energy’s Office of Scientific and Technical Information, the evaluation confirmed that DAS can detect small-magnitude seismic events even in loosely packed material. Shallow burial and poor contact with the regolith reduced signal strength, but the system still registered clear waveforms from distant earthquakes. Deeper burial and tighter coupling improved sensitivity, suggesting that modest engineering steps, such as trenching cables a bit farther below the surface, could yield robust lunar performance. For a real deployment, the absence of wind and most human-generated noise would likely enhance signal-to-noise ratios beyond what the Earth-based tests achieved.
A Fiber Seismic Network Spanning Kilometers
While the Los Alamos experiments focused on feasibility in regolith-like soil, other researchers have explored what a fully realized lunar fiber network could do scientifically. A modeling study at Caltech, published in Seismological Research Letters and archived through Caltech’s institutional repository, used synthetic lunar seismograms to evaluate whether DAS could retrieve signals from deep within the Moon.
In that work, scientists simulated how seismic waves would interact with a hypothetical array consisting of roughly 40 kilometers of fiber laid across the surface. By stacking observations along the cable, they found that DAS could detect ScS phases (waves that travel down to the lunar core, reflect, and return to the surface). Because these phases are sensitive to the size, composition, and temperature of the core, being able to see them with a fiber network would open a new window on the Moon’s interior structure.
The Apollo-era seismometers (which operated from 1969 to 1977) remain the only direct seismic instruments ever deployed on the Moon. Those stations were few in number, fixed in place, and limited in bandwidth. A fiber network, by contrast, offers thousands of sensing points per kilometer of cable, providing dense spatial sampling over broad areas. As a press summary of the Caltech work explained, the ability to retrieve core-reflected phases with DAS would enable far more detailed imaging of the Moon’s layered interior than a sparse grid of point sensors can deliver.
Why Moonquakes Threaten Future Outposts
The scientific payoff is only part of the story. The practical urgency behind lunar DAS comes from the dangers that moonquakes pose to infrastructure and crews. In the dry, rigid lunar crust, seismic waves attenuate far less than they do in Earth’s fractured, water-saturated rocks. As a result, moonquakes can reverberate for hours, with energy repeatedly bouncing within the crustal shell.
Shallow moonquakes are particularly worrisome. These events originate close to the surface and can reach magnitudes comparable to moderate terrestrial earthquakes. Because they are so near the regolith layer, they can efficiently shake loose fine particles and gravel. Nick Donahue, a researcher at Los Alamos National Laboratory, warned in a lab statement that if people or structures are present, seismic shaking could “essentially sandblast them and cause damage at a great distance.” Unlike on Earth, where vegetation, atmosphere, and moisture help trap or damp dust, the Moon offers little protection against high-velocity grains lofted by vibrations.
For any permanent habitat, early warning of seismic activity and detailed records of how the ground moves will be essential. Engineers will need to know not just how strong a quake is, but how motion varies from one outpost module to another, how regolith slopes respond, and whether repeated shaking is destabilizing foundations. A distributed fiber system, with sensors every few meters, can provide that fine-grained picture without requiring hundreds of individual seismometers to be emplaced and maintained.
Dual-Use Infrastructure on the Lunar Surface
Most early discussions of lunar DAS have treated it as a dedicated science instrument, but the more consequential possibility is dual-use deployment. Any permanent base will need fiber-optic cables for high-bandwidth communication between habitats, power stations, landing pads, and rovers. If those same cables can function as a seismic array, mission planners can obtain a global monitoring system essentially “for free,” aside from the cost of integrating DAS interrogators and data processing.
In a typical design, fibers would run along utility corridors that already connect key facilities. Buried several tens of centimeters below the surface, they would be shielded from micrometeorite impacts and thermal extremes while remaining close enough to the regolith to sense ground motion. DAS units housed inside pressurized modules or shielded vaults would inject laser pulses into the network and record the backscattered light. Software would convert those optical distortions into estimates of strain along the cable, which seismologists could then invert to map the location and magnitude of moonquakes.
Because DAS turns every meter of fiber into a sensor, a single loop around a base could yield tens of thousands of virtual stations. As the outpost grows and additional communication lines are installed, the sensing footprint would naturally expand. Future surface power grids, long-distance rover routes, and links to radio telescopes on the lunar far side could all double as seismic arms, gradually building a basin-scale network without dedicated deployment campaigns.
From Laboratory Tests to Lunar Deployment
Translating the Los Alamos results into a flight-ready system will still require engineering work. Fibers must survive extreme temperature swings, radiation, and abrasive dust, and interrogator units will need to operate reliably for years with minimal maintenance. Data volumes from continuous DAS monitoring can be enormous, so onboard processing and smart compression will be important to avoid overloading communication links back to Earth.
Even so, the core message of the regolith experiments is that the physics is sound: standard telecom-grade fibers, when properly buried, can register subtle seismic waves in lunar-like soil. Combined with modeling that shows long cables can probe the Moon’s deep interior, the technology offers a rare opportunity to merge mission-critical communications with frontier geophysics. As space agencies and commercial partners refine their plans for lunar bases, the question is no longer whether fiber-optic DAS can work on the Moon, but whether they can afford to lay cable without turning it into a planet-scale listening device as well.
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*This article was researched with the help of AI, with human editors creating the final content.
