A GFZ-led team analysed selected earthquakes from the past 10 years at Campi Flegrei near Naples and reconstructed seismic structures with unprecedented detail. Newly identified long-period signals indicate a fluid-filled, fissure-like structure approximately 3.5 kilometres deep, linking a gas-and-magma reservoir to surface fumaroles. Estimated dimensions are about 1,000 metres long, 650 metres wide, and 0.35 metres high. Its resonance frequency has remained stable in recent years, suggesting that the overlying rock is currently stable.[1]
The findings show that seismic signals can reveal hidden fluid pathways, their geometry, and changing pressure conditions before catastrophic failure. For lunar settlements, the direct analogue is not volcanism but detection of subsurface volatile migration, fracture activation, thermal anomalies, and pressure changes beneath sealed habitats or storage caverns. The study also demonstrates that submarine and weak-zone geometries may differ substantially from existing surface-based models, making three-dimensional subsurface mapping essential for infrastructure risk assessment.[1]
The Ark team should integrate long-period seismic monitoring, distributed fibre-optic sensing, and fluid-pathway tomography into lunar-site qualification and continuous operations. Establish baseline resonance frequencies and deformation patterns before construction; flag persistent frequency shifts, new seismic clusters, or migration toward inhabited zones; and maintain redundant sensor coverage beneath habitats, power systems, and biological archives. Earth analogues such as Campi Flegrei should inform automated early-warning models, while the broader volcanic-risk context warrants preserving multiple archives outside any single geologically active or fracture-prone sector.[1][2]