Dense Seismic Array Monitoring of the Glacier Tongue of Isunnguata Sermia, West Greenland

Paris, N ORCID: 0009-0001-2412-8370, Gimbert, F, Le Bris, T, Livingstone, SJ, Doyle, SH, Michel, A, Sole, AJ ORCID: 0000-0001-5290-8967, Lecointre, A, Pinzon-Rincon, L ORCID: 0000-0002-2432-227X, Hillers, G ORCID: 0000-0003-2341-1892, Courbis, R, Roux, P, Barruol, G, Bagshaw, EA, Chudley, TR ORCID: 0000-0001-8547-1132, Craw, L, Edwards, LA ORCID: 0000-0001-9936-6966, Gilbert, A, Hawkins, JD, Ing, RN ORCID: 0000-0001-9767-3209 et al (2026) Dense Seismic Array Monitoring of the Glacier Tongue of Isunnguata Sermia, West Greenland. Seismica, 5 (2).

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Abstract

Accelerating mass loss from the Greenland Ice Sheet is affected by meltwater-driven changes in ice dynamics, which remain poorly understood due to limited observations. Here, we present a 2.5 km2 wide dense passive seismic array experiment conducted in the ablation zone of Isunnguata Sermia, West Greenland. We target varying surface melt conditions through one-month long monitoring periods in spring, summer, and fall using 82-117 nodes deployed in 2023 and 2024 complemented by multi-week surface Distributed Acoustic Sensing acquisitions in 2024. We assess data quality using power spectral densities and noise correlation functions. We find that low-frequency seismic power is highly correlated to ice surface velocity, suggesting a strong control of subglacial hydrology on ice dynamics. We retrieve stable and high signal-to-noise ratio noise correlations containing Rayleigh, Love, and P wave arrivals, suggesting these may successfully be used for glacier structure imaging and monitoring. We finally demonstrate we can locate numerous seismic events with resolution down to a few meters using Matched Field Processing and which exhibit characteristic spatial patterns evolving across seasons. These findings establish the potential of such experiment to infer glacier hydrology, dynamics, and structure at high spatial and temporal resolution.

Item Type:	Article
Uncontrolled Keywords:	37 Earth Sciences; 3709 Physical Geography and Environmental Geoscience; 3705 Geology
Subjects:	G Geography. Anthropology. Recreation > GB Physical geography G Geography. Anthropology. Recreation > GE Environmental Sciences
Divisions:	Biological and Environmental Sciences (from Sep 19)
Publisher:	McGill University Library and Archives
Date of acceptance:	29 June 2026
Date of first compliant Open Access:	27 July 2026
Date Deposited:	27 Jul 2026 10:55
Last Modified:	27 Jul 2026 10:55
DOI or ID number:	10.26443/seismica.v5i2.2557
URI:	https://researchonline.ljmu.ac.uk/id/eprint/29065

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