Marsan D., Weiss J., Métaxian Jean-Philippe, Grangeon J., Roux P. F., Haapala J. (2011). Low-frequency bursts of horizontally polarized waves in the Arctic sea-ice cover. Journal of Glaciology, 57 (202), p. 231-237. ISSN 0022-1430.
Titre du document
Low-frequency bursts of horizontally polarized waves in the Arctic sea-ice cover
Marsan D., Weiss J., Métaxian Jean-Philippe, Grangeon J., Roux P. F., Haapala J.
Source
Journal of Glaciology, 2011,
57 (202), p. 231-237 ISSN 0022-1430
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 similar to 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.
Plan de classement
Sciences du milieu [021]
;
Géologie et formations superficielles [064]
