声波全波形反演改进地震模拟的综合研究

IF 2.5 4区地球科学 Q2 GEOGRAPHY, PHYSICAL

Annals of Glaciology Pub Date : 2022-09-01 DOI:10.1017/aog.2023.10

E. Pearce, A. Booth, S. Rost, P. Sava, T. Konuk, A. Brisbourne, B. Hubbard, I. Jones

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引用次数: 2

摘要

雪的密度结构对水文和气候模拟以及冰架稳定性具有重要意义。坚硬结构可以通过地震速度的深度模型进行评估，该模型广泛应用于HWI反演，该方法考虑了折射地震到达的缓慢性。然而，HWI只适用于稳定状态的地层剖面，当地层含有冰层时，反演精度会受到影响。在这些情况下，全波形反演(FWI)可能比HWI更成功。FWI通过考虑完整的地震波形和反射到达，扩展了HWI的功能，从而提供更准确的速度剖面估计。我们发现，在其他稳定状态的公司剖面中，FWI对速度模型的表征误差仅为1.7%(与HWI相比为4.2%)，其中有冰盖(20米厚，40米深)。

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

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.

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来源期刊

Annals of Glaciology GEOGRAPHY, PHYSICAL-GEOSCIENCES, MULTIDISCIPLINARY

CiteScore

8.20

自引率

0.00%

发文量

审稿时长

>12 weeks

期刊介绍： Annals of Glaciology publishes original scientific articles and letters in selected aspects of glaciology-the study of ice. Each issue of the Annals is thematic, focussing on a specific subject. The Council of the International Glaciological Society welcomes proposals for thematic issues from the glaciological community. Once a theme is approved, the Council appoints an Associate Chief Editor and a team of Scientific Editors to handle the submission, peer review and publication of papers.