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Author
Barruol Guilhem, Cordier Emmanuel, Bascou Jérôme, Fontaine Fabrice R., Legrésy Benoit, Lescarmontier Lydie
Title
Tide‐induced microseismicity in the Mertz glacier grounding area, East Antarctica
Type
Journal
Year
2013
Publication
Geophysical Research Letters
Abbreviated Journal
Volume
40
Issue
20
Pages
5412-5416
Keywords
Adélie land Antarctica cryoseismology icequakes Mertz glacier tide
Abstract
AbstractThe deployment of a seismic network along the Adélie 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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0094-8276
ISBN
0094-8276
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Notes
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yes
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6826
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