Articles | Volume 14, issue 5
The Cryosphere, 14, 1475–1496, 2020
The Cryosphere, 14, 1475–1496, 2020

Research article 05 May 2020

Research article | 05 May 2020

Quantification of seasonal and diurnal dynamics of subglacial channels using seismic observations on an Alpine glacier

Ugo Nanni et al.

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Cited articles

Aki, K. and Richards, P. G.: Quantitative seismology, University Science Books, US, 2002. a
Allstadt, K. and Malone, S. D.: Swarms of repeating stick-slip icequakes triggered by snow loading at Mount Rainier volcano, J. Geophys. Res.-Earth, 119, 1180–1203, 2014. a
Anderson, S. P., Longacre, S. A., and Kraal, E. R.: Patterns of water chemistry and discharge in the glacier-fed Kennicott River, Alaska: evidence for subglacial water storage cycles, Chem. Geol., 202, 297–312, 2003. a
Andrews, L. C., Catania, G. A., Hoffman, M. J., Gulley, J. D., Lüthi, M. P., Ryser, C., Hawley, R. L., and Neumann, T. A.: Direct observations of evolving subglacial drainage beneath the Greenland Ice Sheet, Nature, 514, 80–83, 2014. a, b, c
Bartholomaus, T. C., Anderson, R. S., and Anderson, S. P.: Response of glacier basal motion to transient water storage, Nat. Geosci., 1, p. 33, 2008. a
Short summary
Our study addresses key questions on the subglacial drainage system physics through a novel observational approach that overcomes traditional limitations. We conducted, over 2 years, measurements of the subglacial water-flow-induced seismic noise and of glacier basal sliding speeds. We then inverted for the subglacial channel's hydraulic pressure gradient and hydraulic radius and investigated the links between the equilibrium state of subglacial channels and glacier basal sliding.