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

Emma Pearce*, Adam D. Booth, Sebastian Rost, Paul Sava, Tuǧrul Konuk, Alex Brisbourne, Bryn Hubbard, Ian Jones

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (SciVal)
31 Downloads (Pure)

Abstract

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.

Original languageEnglish
Pages (from-to)44-48
Number of pages5
JournalAnnals of Glaciology
Volume63
Issue number87-89
DOIs
Publication statusPublished - 20 Mar 2023

Keywords

  • glacier geophysics
  • glacier modelling
  • polar firn
  • seismics
  • seismology

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