Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network
- 1Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Bologna, Italy
- 2Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma2, Roma, Italy
- 3Department of Science, Roma Tre University, Rome, Italy
- 1Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Bologna, Bologna, Italy
- 2Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Roma2, Roma, Italy
- 3Department of Science, Roma Tre University, Rome, Italy
Abstract. We analyze seismic time series collected during experimental campaigns in the area of the David Glacier, South Victoria Land, Antarctica, between 2003 and 2016. We observe hundreds of repeating seismic events, characterized by highly correlated waveforms (cross-correlation > 0.95), which mainly occur in the floating area between the grounding and the floating line of the ice stream. The joint analysis of seismic occurrences and observed local tide measurements seem to show that seismicity is not triggered by a seasonal, regular, periodic forcing such as the ocean tide, but more likely by transient irregular impulses. We consider possible environmental processes and their impact on the coupling between the glacier flow and the bedrock brittle failure. Our results suggest that clustered and repeated seismic events may be correlated with transient episodes of mass ice discharge (observed by satellite GRACE and GRACE-FO experiments) through the subglacial hydrographic system that originates upstream of the glacier and extends to the grounding zone, lubricating the interface with the bedrock.
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Stefania Danesi et al.
Status: open (until 08 Jun 2022)
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RC1: 'Comment on egusphere-2022-29', Anonymous Referee #1, 27 Apr 2022
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The paper titled "Cryo-seismicity triggered by ice mass discharge through the Antarctic subglacial hydrographic network" by S. Danesi et al. has sufficient review of long term seismicity around the David Glacier of South Victoria Land, Antarctica, by comparing different environmental parameters of meteorological and tidal, satellite information by GRACE etc.. The discussed contents and results are enough credible in regards to the currrent avairable dataset by the authers. The full paper has enough sofisticated as already reviewed by another referees, but please make minor revisions as mentioned below.
page 2, line 62; Bannister and Kennett (2002); This article is not included in the Referneces. Please add.
Figure 2: We cannot identitfy the exact location of the ice-rader profile on the map above. Please add the profile location.
Figure 5. B) Ravels for Cl_0x, Cl_0y, Cl_z, etc. Please add the one-order number. We cannot identify which clasters are the ones.
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AC1: 'Reply on RC1', Stefania Danesi, 02 May 2022
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Reply to Referee 1:
Dear Referee
we are grateful for your positive comments.
We have changed the manuscript in accord with your requests:
page 2, line 62; Bannister and Kennett (2002); This article is not included in the Referneces. Please add.
Yes, thank you. Done
Figure 2: We cannot identitfy the exact location of the ice-rader profile on the map above. Please add the profile location.
Done
Figure 5. B) Ravels for Cl_0x, Cl_0y, Cl_z, etc. Please add the one-order number. We cannot identify which clasters are the ones.
Done
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AC1: 'Reply on RC1', Stefania Danesi, 02 May 2022
reply
Stefania Danesi et al.
Stefania Danesi et al.
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