Seismic Monitoring of Underground Explosions

Seismic monitoring of underground explosions employs a network of sensors to record elastic waves generated by a sudden release of energy beneath the Earth’s surface. These recordings enable detection, location and characterization of clandestine tests, supporting nuclear-test-ban verification and geophysical research. Techniques range from local arrays that capture high-frequency P- and S-wave arrivals to far-regional stations that record lower-frequency surface waves at teleseismic distances. Discrimination between explosive sources and natural earthquakes relies on differences in waveform signatures, spectral content and radiation patterns. Advanced methods include full-waveform inversion to build three-dimensional velocity models, spectral ratio analysis to remove path effects, and moment tensor inversion to quantify source mechanisms. Together, these approaches yield robust estimates of yield, depth and cavity dynamics, while also tracing secondary phenomena such as rock chimney collapse and aftershock sequences. The global network underpinning this field ensures timely, accurate monitoring of any underground detonation, underlining its strategic and scientific significance.

Research from Nature Portfolio

A study of a magnitude-5.6 underground nuclear test revealed unprecedented strong ground accelerations on the test-site surface, with values decaying exponentially with distance. Shallow seismic events recorded in the aftermath were clustered within a 15 km radius and exhibited moment tensor solutions combining double-couple and CLVD components, indicative of rock failure in a damaged medium rather than tectonic faulting. This work demonstrated that comprehensive monitoring of post-detonation seismicity can illuminate stress redistribution around the explosion cavity and inform assessments of rock stability and containment integrity.

Seismic Monitoring of Underground Explosions publication trend

The graph below shows the total number of articles in seismic monitoring of underground explosions across all publications each year (not limited to Nature Index journals).

Technical terms

Waveform tomography: A technique that inverts recorded seismic waveforms to construct three-dimensional velocity and anisotropy models of the Earth’s interior, improving simulation of wave propagation.

Coda spectral ratio: The ratio of narrow-band envelope spectra of late-arriving seismic waves, used to cancel path and site effects and isolate source characteristics such as relative energy release.

Moment tensor inversion: A mathematical approach to determine the equivalent force system of a seismic source, revealing proportions of isotropic explosion, double-couple faulting and compensated linear vector dipole components.

Peak ground acceleration: The maximum instantaneous acceleration recorded at a site during seismic shaking, often expressed in metres per second squared, which reflects the intensity of near-source ground motion.

References

1. Waveform Tomography Improves Far-Regional Distance Simulations of Underground Nuclear Explosions and Earthquakes from the Former Nuclear Test Site, Western United States. The Seismic Record (2024).
2. Reexamination confirming additional seismic evidence for the 12 May 2010 low-yield nuclear test. Earthquake Research Advances (2025).
3. Seismic detection of strong ground motions by MW5.6 North Korean nuclear explosion. Scientific Reports (2019).
4. Yield estimation of North Korean underground nuclear tests using Lg-wave source spectra. Frontiers in Earth Science (2024).