Repeating Low Frequency Icequakes in the Mont‐Blanc Massif Triggered by Snowfalls

Helmstetter, Agnès

doi:10.1029/2022jf006837

JGR Earth Surface

2022

DOI: 10.1029/2022jf006837

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Repeating Low Frequency Icequakes in the Mont‐Blanc Massif Triggered by Snowfalls

Agnès Helmstetter

Abstract: I detected low frequency icequake signals with a main frequency of 5 Hz that repeat every few minutes• Low frequency icequakes mainly occur during and after snowfall episodes• They are located on several glaciers of the Mont-Blanc massif mainly above 3000 m a.s.l. where the basal ice is possibly cold

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Cited by 2 publications

References 79 publications

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Evaluating Automated Seismic Event Detection Approaches: An Application to Victoria Land, East Antarctica

Ho,

Walter,

Hansen

et al. 2024

Journal of Geophysical Research: Machine Learning and Computati

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As seismic data collection continues to grow, advanced automated processing techniques for robust phase identification and event detection are becoming increasingly important. However, the performance, benefits, and limitations of different automated detection approaches have not been fully evaluated. Our study examines how the performance of conventional techniques, including the Short‐Term Average/Long‐Term Average method and cross‐correlation approaches, compares to that of various deep learning models. We also evaluate the added benefits that transfer learning may provide to machine learning‐based seismic applications. Each detection approach has been applied to 3 years of data recorded by stations in East Antarctica, which contain both cryospheric and tectonic‐related seismic events. Our results demonstrate that by integrating different event detection approaches with transfer learning, the strengths of each approach can maximize seismic detection accuracy and reliability while also enhancing the completeness of associated event catalogs. That said, model performance can vary, depending on the quality of the data set as well as the data augmentation schemes and training strategies employed. Our results in East Antarctica provide new insight into polar seismicity and demonstrate how automated event detection approaches can be optimized to investigate seismic activity in challenging environments.

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Evaluating Automated Seismic Event Detection Approaches: An Application to Victoria Land, East Antarctica

Ho,

Walter,

Hansen

et al. 2024

Journal of Geophysical Research: Machine Learning and Computati

View full text Add to dashboard Cite

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Array processing in cryoseismology: a comparison to network-based approaches at an Antarctic ice stream

Hudson,

Brisbourne,

Kufner

et al. 2023

The Cryosphere

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Abstract. Seismicity at glaciers, ice sheets, and ice shelves provides observational constraint on a number of glaciological processes. Detecting and locating this seismicity, specifically icequakes, is a necessary first step in studying processes such as basal slip, crevassing, imaging ice fabric, and iceberg calving, for example. Most glacier deployments to date use conventional seismic networks, comprised of seismometers distributed over the entire area of interest. However, smaller-aperture seismic arrays can also be used, which are typically sensitive to seismicity distal from the array footprint and require a smaller number of instruments. Here, we investigate the potential of arrays and array-processing methods to detect and locate subsurface microseismicity at glaciers, benchmarking performance against conventional seismic-network-based methods for an example at an Antarctic ice stream. We also provide an array-processing recipe for body-wave cryoseismology applications. Results from an array and a network deployed at Rutford Ice Stream, Antarctica, show that arrays and networks both have strengths and weaknesses. Arrays can detect icequakes from further distances, whereas networks outperform arrays in more comprehensive studies of a particular process due to greater hypocentral constraint within the network extent. We also gain new insights into seismic behaviour at the Rutford Ice Stream. The array detects basal icequakes in what was previously interpreted to be an aseismic region of the bed, as well as new icequake observations downstream and at the ice stream shear margins, where it would be challenging to deploy instruments. Finally, we make some practical recommendations for future array deployments at glaciers.

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Repeating Low Frequency Icequakes in the Mont‐Blanc Massif Triggered by Snowfalls

Cited by 2 publications

References 79 publications

Evaluating Automated Seismic Event Detection Approaches: An Application to Victoria Land, East Antarctica

Evaluating Automated Seismic Event Detection Approaches: An Application to Victoria Land, East Antarctica

Array processing in cryoseismology: a comparison to network-based approaches at an Antarctic ice stream

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