000007802 001__ 7802
000007802 005__ 20260113134710.0
000007802 037__ $$aPOSTER-2026-0025
000007802 100__ $$aVan Noten, Koen
000007802 245__ $$aMonitoring permafrost freeze-up with ambient seismic noise
000007802 260__ $$c2025
000007802 269__ $$c2025-09-11
000007802 520__ $$aUnderstanding organic carbon release from permafrost soils is essential to predict the impact of permafrost thawing on our warming climate. In soils, freeze-thaw processes and the redistribution of water control how and when permafrost dissolved organic carbon is exported. In late autumn 2023, we buried 4 seismic geophones, aka seismic nodes, at the Eight Mile Lake site (Alaska, USA) at two different locations with a different level of permafrost degradation and let them freeze-in during six weeks to monitor freeze-up. Horizontal/Vertical spectral ratio analysis of the recorded ambient seismic noise and other seismological techniques show seismic velocity changes as the active layer deepens, allowing tracking the freezing front over time and depth. Although longer and replicated times series are still needed to fully understand the effect of freeze-thaw cycles on soil water movement, this tentative experiment already shows the potential of using seismic instruments for gathering permafrost time series. 
000007802 594__ $$aNO
000007802 6531_ $$aPermafrost
000007802 6531_ $$aAlaska
000007802 6531_ $$aHVSR analysis
000007802 700__ $$aRoux, Philippe
000007802 700__ $$aGovoorts, Julien
000007802 700__ $$aBatista, Cassandra
000007802 700__ $$aDe Plaen, Raphael
000007802 700__ $$aLecocq, Thomas
000007802 700__ $$aOpfergelt, Sophie
000007802 773__ $$tBE-Polar Conference 2025, Brussels, Belgium
000007802 8560_ $$fkoen.vannoten@ksb-orb.be
000007802 980__ $$aCPOSTER