Tide-induced microseismicity in the Mertz glacier grounding area, East Antarctica
| Type | Article | ||||||||
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| Date | 2013-10 | ||||||||
| Language | English | ||||||||
| Author(s) | Barruol Guilhem1, Cordier Emmanuel1, Bascou Jerome2, Fontaine Fabrice R.1, Legresy Benoit3, Lescarmontier Lydie3, 4 | ||||||||
| Affiliation(s) | 1 : Univ Paris Diderot, CNRS UMR 7154, Sorbonne Paris Cite, Lab GeoSci Reunion,Univ La Reunion,Inst Phys Glob, FR-97744 St Denis, France. 2 : Univ St Etienne, CNRS UMR 6524, Univ Lyon, Lab Magmas & Volcans, St Etienne, France. 3 : Lab Etud Geophys & Oceanog Spatiale, Toulouse, France. 4 : Australian Natl Univ, Res Sch Earth Sci, Acton, ACT, Australia. |
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| Source | Geophysical Research Letters (0094-8276) (Amer Geophysical Union), 2013-10 , Vol. 40 , N. 20 , P. 5412-5416 | ||||||||
| DOI | 10.1002/2013GL057814 | ||||||||
| WOS© Times Cited | 23 | ||||||||
| Keyword(s) | icequakes, Mertz glacier, tide, Antarctica, cryoseismology, Adélie land | ||||||||
| Abstract | The deployment of a seismic network along the Adelie and George V coasts in East Antarctica during the period 2009-2012 provides the opportunity to monitor cryoseismic activity and to obtain new insights on the relationship between tidal cycles and coastal glacier dynamics. Here we focus on records from a seismometer located on a rocky outcrop in the vicinity of the grounding line of the 35 km broad Mertz glacier, a major outflow of this region. We detect numerous icequakes (50,000 events within 10 months and up to 100 events/h) and demonstrate their clear tidal modulation. We suggest that they result from ice friction and fracturing around the rocky peak and from the glacier flexure in response to the falling and rising tides at its grounding area. We propose that such icequake monitoring could be used as a climate proxy since grounding lines are subject to migrate with sea level changes. | ||||||||
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