A synthetic study of acoustic full waveform inversion to improve seismic modelling of firn

Pearce, Emma; Booth, Adam D.; Rost, Sebastian; Sava, Paul; Konuk, Tuğrul; Brisbourne, Alex ORCID: https://orcid.org/0000-0002-9887-7120; Hubbard, Bryn; Jones, Ian. 2022 A synthetic study of acoustic full waveform inversion to improve seismic modelling of firn. Annals of Glaciology, 63 (87-89). 44-48. 10.1017/aog.2023.10

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Abstract/Summary

The density structure of firn has implications for hydrological and climate modelling and for ice shelf stability. The firn structure can be evaluated from depth models of seismic velocity, widely obtained with Herglotz-Wiechert inversion (HWI), an approach that considers the slowness of refracted seismic arrivals. However, HWI is appropriate only for steady-state firn profiles and the inversion accuracy can be compromised where firn contains ice layers. In these cases, Full Waveform Inversion (FWI) can be more successful than HWI. FWI extends HWI capabilities by considering the full seismic waveform and incorporates reflected arrivals, thus offering a more accurate estimate of a velocity profile. We show the FWI characterisation of the velocity model has an error of only 1.7% for regions (vs. 4.2% with HWI) with an ice slab (20 m thick, 40 m deep) in an otherwise steady-state firn profile.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1017/aog.2023.10
ISSN:	0260-3055
Additional Keywords:	glacier geophysics, glacier modelling, polar firn, seismics, seismology
Date made live:	05 Dec 2023 13:47 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/536405

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1017/aog.2023.10

ISSN:

0260-3055

Additional Keywords:

glacier geophysics, glacier modelling, polar firn, seismics, seismology

Date made live:

05 Dec 2023 13:47 +0 (UTC)

URI:

https://nora.nerc.ac.uk/id/eprint/536405