Tide-induced microseismicity in the Mertz glacier grounding area, East Antarctica
The 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...
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| Published in | Geophysical research letters Vol. 40; no. 20; pp. 5412 - 5416 |
|---|---|
| Main Authors | , , , , , |
| Format | Journal Article |
| Language | English |
| Published |
Washington
Blackwell Publishing Ltd
28.10.2013
John Wiley & Sons, Inc American Geophysical Union |
| Subjects | |
| Online Access | Get full text |
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| Abstract | The 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.
Key Points
Large microseismicity is recorded at the Mertz glacier grounding area
Icequakes show clear evidence of tide modulation
Ice fracturing is proposed to be largely controlled by glacier flexure |
|---|---|
| AbstractList | The 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.
Large microseismicity is recorded at the Mertz glacier grounding area
Icequakes show clear evidence of tide modulation
Ice fracturing is proposed to be largely controlled by glacier flexure 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. Key Points * Large microseismicity is recorded at the Mertz glacier grounding area * Icequakes show clear evidence of tide modulation * Ice fracturing is proposed to be largely controlled by glacier flexure The 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. Key Points Large microseismicity is recorded at the Mertz glacier grounding area Icequakes show clear evidence of tide modulation Ice fracturing is proposed to be largely controlled by glacier flexure The 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. |
| Author | Fontaine, Fabrice R. Legrésy, Benoit Barruol, Guilhem Lescarmontier, Lydie Cordier, Emmanuel Bascou, Jérôme |
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| Copyright | 2013. American Geophysical Union. All Rights Reserved. Distributed under a Creative Commons Attribution 4.0 International License |
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| References_xml | – reference: von der Osten-Woldenburg, H. (1990), Icequakes from Ekström ice shelf near Atka Bay, Antarctica, J. Glaciol., 36(122), 31-36. – reference: Sinadinovski, C., K. Muirhead, M. Leonard, S. Spiliopoulos, and D. Jespen (1999), Effective discrimination of icequakes on seismic records from Mawson station, Phys. Earth Planet. Inter., 113(1-4), 203-211, doi:10.1016/s0031-9201(99)00005-9. – reference: Weiss, J. (2004), Subcritical crack propagation as a mechanism of crevasse formation and iceberg calving, J. Glaciol., 50(168), 109-115, doi:10.3189/172756504781830240. – reference: Schulson, E. M., P. N. Lim, and R. W. Lee (1984), A brittle to ductile transition in ice under tension, Philos. Mag., 49(3), 353-363. – reference: Anandakrishnan, S., and R. B. Alley (1997), Tidal forcing of basal seismicity of ice stream C, West Antarctica, observed far inland, J. Geophys. Res., 102(B7), 15,183-15,196, doi:10.1029/97jb01073. – reference: Mayet, C., L. Testut, B. 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| Snippet | The 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... The 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... 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... |
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| SubjectTerms | Adélie land Antarctica cryoseismology Earth Sciences Flexing Fracturing Geophysics Glaciers Grounding icequakes Marine Mertz glacier Modulation Sciences of the Universe Sea level changes Seismic phenomena Seismology tide Tides |
| Title | Tide-induced microseismicity in the Mertz glacier grounding area, East Antarctica |
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