Hudson, Thomas S. and Brisbourne, Alex M. and Walter, F. and Graff, D. and White, R. S. and Smith, A. M. (2019) Icequake source mechanisms for studying glacial sliding. Journal of Geophysical Research-Earth Surface, 125 (11). ISSN 2169-9011 DOI https://doi.org/10.1029/2020JF005627
![]() |
Text
Icequake_source_mechanisms_for_studying_glacial_sliding_draft.pdf - Accepted Version Restricted to Repository staff only Available under License Creative Commons Attribution. Download (21MB) | Request a copy |
![]() |
Text
2020JF005627.pdf - Published Version Available under License Creative Commons Attribution. Download (8MB) |
![]() |
Text
jgrf21271-sup-0001-2020jf005627-si.pdf - Supplemental Material Download (1MB) |
Abstract
Improving our understanding of glacial sliding is crucial for constraining basal drag in ice dynamics models. We use icequakes, sudden releases of seismic energy as the ice slides over the bed, to provide geophysical observations that can be used to aid understanding of the physics of glacial sliding and constrain ice dynamics models. These icequakes are located at the bed of an alpine glacier in Switzerland and the Rutford Ice Stream, West Antarctica, two extremes of glacial settings and spatial scales. We investigate a number of possible icequake source mechanisms by performing full waveform inversions to constrain the fundamental physics and stress release during an icequake stick-slip event. Results show that double-couple mechanisms best describe the source for the events from both glacial settings and the icequakes originate at or very near the ice-bed interface. We also present an exploratory method for attempting to measure the till shear modulus, if indirect reflected icequake radiation is observed. The results of this study increase our understanding of how icequakes are associated with basal drag while also providing the foundation for a method of remotely measuring bed shear strength
Item Type: | Article |
---|---|
Uncontrolled Keywords: | 2019AREP; IA75 |
Subjects: | 02 - Geodynamics, Geophysics and Tectonics |
Divisions: | 02 - Geodynamics, Geophysics and Tectonics 07 - Gold Open Access 12 - PhD |
Journal or Publication Title: | Journal of Geophysical Research-Earth Surface |
Volume: | 125 |
Identification Number: | https://doi.org/10.1029/2020JF005627 |
Depositing User: | Sarah Humbert |
Date Deposited: | 29 Mar 2019 12:05 |
Last Modified: | 11 Mar 2021 18:56 |
URI: | http://eprints.esc.cam.ac.uk/id/eprint/4434 |
Actions (login required)
![]() |
View Item |