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Low-frequency bursts of horizontally polarized waves in the Arctic sea-ice cover

David Marsan 1 Jérôme Weiss 2 Jean-Philippe Metaxian 3 Jacques Grangeon 3 Pierre-François Roux 4 Jari Haapala 5
1 Mécanique des failles [?-2015]
ISTerre [2011-2015] - Institut des Sciences de la Terre [2011-2015]
2 EDGe
LGGE - Laboratoire de glaciologie et géophysique de l'environnement
3 Géophysique des volcans & géothermie [2011-2015]
ISTerre [2011-2015] - Institut des Sciences de la Terre [2011-2015]
Abstract : We report the detection of bursts of low-frequency waves, typically f = 0.025 Hz, on horizontal channels of broadband seismometers deployed on the Arctic sea-ice cover during the DAMOCLES (Developing Arctic Modeling and Observing Capabilities for Long-term Environmental Studies) experiment in spring 2007. These bursts have amplitudes well above the ambient ice swell and a lower frequency content. Their typical duration is of the order of minutes. They occur at irregular times, with periods of relative quietness alternating with periods of strong activity. A significant correlation between the rate of burst occurrences and the ice-cover deformation at the ~400 km scale centered on the seismic network suggests that these bursts are caused by remote, episodic deformation involving shearing across regional-scale leads. This observation opens the possibility of complementing satellite measurements of ice-cover deformation, by providing a much more precise temporal sampling, hence a better characterization of the processes involved during these deformation events.
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Submitted on : Thursday, December 1, 2011 - 2:38:15 PM
Last modification on : Friday, September 25, 2020 - 9:16:03 AM

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David Marsan, Jérôme Weiss, Jean-Philippe Metaxian, Jacques Grangeon, Pierre-François Roux, et al.. Low-frequency bursts of horizontally polarized waves in the Arctic sea-ice cover. Journal of Glaciology, International Glaciological Society, 2011, 57 (202), pp.231-237. ⟨10.3189/002214311796405834⟩. ⟨insu-00647088⟩



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