Future Artemis missions could leverage a surprisingly simple tool for monitoring lunar seismic activity: fiber-optic cables. Two new studies suggest these cables, laid directly on the moon’s surface, could act as highly sensitive detectors for moonquakes, offering a lightweight and cost-effective alternative to traditional seismometers. This approach builds upon distributed acoustic sensing (DAS), a method where laser pulses traveling through optical fibers detect minute vibrations along the entire cable length.
Apollo’s Legacy & The Need for Expansion
The Apollo missions demonstrated that the moon is seismically active, recording thousands of quakes between 1969 and 1977. However, those instruments were bulky, expensive, and limited in their reach. A single fiber-optic cable could function like thousands of seismic sensors, dramatically increasing coverage—a critical improvement given the planned expansion of lunar operations under NASA’s Artemis program.
How Moonquakes Differ from Earthquakes
Moonquakes are fundamentally different from earthquakes. Without tectonic plates, lunar tremors stem from tidal forces exerted by Earth, meteorite impacts, and extreme temperature fluctuations. This results in prolonged shaking, as seismic energy dissipates slowly within the moon’s fractured interior. Studying these quakes will provide insight into the moon’s core composition and the presence of fault lines.
Implications for Human Presence
Understanding moonquake activity isn’t just academic; it’s crucial for astronaut safety and infrastructure planning. Prolonged vibrations could jeopardize habitats, landing pads, and other equipment. Mapping quake-prone areas will help engineers select safer base locations and design resilient structures. The potential for long-lasting tremors demands proactive mitigation, especially as NASA aims for a sustained human presence on the moon.
Deployment Logistics and Key Findings
Researchers at Los Alamos National Laboratory have found that fiber-optic cables can perform effectively even when unburied on the airless lunar surface. One study, published in Icarus, showed that signal clarity remained consistent regardless of burial depth. Another, appearing in Earth and Space Science, revealed that thicker, stiffer cables yield stronger signals, though weight remains a crucial consideration for space missions.
Beyond Seismology: Dust Tracking
The utility of fiber-optic sensing extends beyond moonquakes. The technology can also track dust and debris spread during spacecraft landings—a vital factor for assessing sandblast risks to future lunar operations.
The simplicity of fiber-optic deployment, coupled with its cost-effectiveness, positions this technology as a cornerstone for future lunar exploration.
This approach offers a significant leap forward in lunar monitoring capabilities, paving the way for safer and more sustainable human presence on the moon.
