Ice plate deformation and cracking revealed by an in situ-distributed acoustic sensing array
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Published:2024-02-21
Issue:2
Volume:18
Page:837-847
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ISSN:1994-0424
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Container-title:The Cryosphere
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language:en
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Short-container-title:The Cryosphere
Author:
Xie JunORCID, Zeng XiangfangORCID, Liang Chao, Ni Sidao, Chu RishengORCID, Bao Feng, Lin Rongbing, Chi Benxin, Lv HaoORCID
Abstract
Abstract. Studying seismic sources and wave propagation in ice plates can provide valuable insights into understanding various processes, such as ice structure dynamics, migration, fracture mechanics and mass balance. However, the harsh environment makes it difficult to conduct in situ dense seismic observations. Consequently, our understanding of the dynamic changes within the ice sheet remains insufficient. We conducted a seismic experiment using a distributed acoustic sensing (DAS) array on a frozen lake, exciting water vibrations through underwater airgun shots. By employing an artificial intelligence method, we were able to detect seismic events that include both high-frequency icequakes and low-frequency events. The icequakes clustered along ice fractures and their activity correlated with local temperature variations. The waveforms of low-frequency events exhibit characteristics of flexural-gravity waves, which offers insights into the properties of the ice plate. Our study demonstrates the effectiveness of an DAS array as an in situ dense seismic network for investigating the internal failure process and dynamic deformation of ice plates such as the ice shelf, which may contribute to an enhanced comprehension and prediction of ice shelf disintegration.
Funder
National Natural Science Foundation of China Chinese Academy of Sciences Natural Science Foundation of Hubei Province
Publisher
Copernicus GmbH
Reference60 articles.
1. Aster, R. C. and Winberry, J. P.: Glacial seismology, Rep. Prog. Phys., 80, 126801, https://doi.org/10.1088/1361-6633/aa8473, 2017. 2. Booth, A. D., Christoffersen, P., Schoonman, C., Clarke, A., Hubbard, B., Law, R., Doyle, S. H., Chudley, T. R., and Chalari, A.: Distributed Acoustic Sensing of Seismic Properties in a Borehole Drilled on a Fast-Flowing Greenlandic Outlet Glacier, Geophys. Res. Lett., 47, e2020GL088148, https://doi.org/10.1029/2020GL088148, 2020. 3. Brisbourne, A. M., Kendall, M., Kufner, S.-K., Hudson, T. S., and Smith, A. M.: Downhole distributed acoustic seismic profiling at Skytrain Ice Rise, West Antarctica, The Cryosphere, 15, 3443–3458, https://doi.org/10.5194/tc-15-3443-2021, 2021. 4. Castongia, E., Wang, H. F., Lord, N., Fratta, D., Mondanos, M., and Chalari, A.: An Experimental Investigation of Distributed Acoustic Sensing (DAS) on Lake Ice, J. Environ. Eng. Geophys., 22, 167–176, https://doi.org/10.2113/JEEG22.2.167, 2017. 5. Chen, Z., Bromirski, P. D., Gerstoft, P., Stephen, R. A., Wiens, D. A., Aster, R. C., and Nyblade, A. A.: Ocean-excited plate waves in the Ross and Pine Island Glacier ice shelves, J. Glaciol., 64, 730–744, https://doi.org/10.1017/jog.2018.66, 2018.
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